918 lines
27 KiB
XML
918 lines
27 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<metadata>
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<idinfo>
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<citation>
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<citeinfo>
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<origin>NOAA, National Geodetic Survey</origin>
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<pubdate>20190402</pubdate>
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<title>Horizontal and Vertical Geodetic Control Data for the Unites States.</title>
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<edition>latest available</edition>
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<geoform>Diagram</geoform>
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<serinfo>
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<sername>N/A</sername>
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<issue>N/A</issue>
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</serinfo>
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<pubinfo>
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<pubplace>NOAA Campus, Silver Spring, MD</pubplace>
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<publish>NOAA, National Geodetic Survey</publish>
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</pubinfo>
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<othercit>
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Questions concerning this data
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may be addressed to
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NGS Information Services Branch
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EMail - ngs.software@noaa.gov
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Phone - 301-713-3242
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</othercit>
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<onlink><http://www.ngs.noaa.gov/cgi-bin/datasheet.prl></onlink>
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</citeinfo>
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</citation>
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<descript>
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<abstract>
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This data contains a set of geodetic control stations
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maintained by the National Geodetic Survey.
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Each geodetic control station in this dataset
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has either a precise Latitude/Longitude used
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for horizontal control or a precise Orthometric Height
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used for vertical control, or both.
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The National Geodetic Survey (NGS) serves
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as the Nation's depository for geodetic data. The NGS
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distributes geodetic data worldwide to a variety of
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users. These geodetic data include the final results
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of geodetic surveys, software programs to format,
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compute, verify, and adjust original survey
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observations or to convert values from one geodetic
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datum to another, and publications that describe how to
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obtain and use Geodetic Data products and services.
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</abstract>
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<purpose>
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Provide a base of reference for latitude, longitude and height
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throughout the United States.
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</purpose>
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</descript>
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<timeperd>
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<timeinfo>
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<sngdate>
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<caldate>20190402</caldate>
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</sngdate>
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</timeinfo>
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<current>retrieval date</current>
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</timeperd>
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<status>
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<progress>Complete</progress>
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<update>Continually</update>
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</status>
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<spdom>
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<bounding>
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<westbc>-73.5</westbc>
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<eastbc>-69.9</eastbc>
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<northbc>42.9</northbc>
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<southbc>41.2</southbc>
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</bounding>
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</spdom>
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<keywords>
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<theme>
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<themekt>geodesy</themekt>
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<themekey>
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NSRS, geodetic, horizontal control,
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vertical control, ellipsoid height, benchmark,
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orthometric height, latitude, longitude
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</themekey>
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</theme>
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<place>
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<placekt>None</placekt>
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<placekey>The geographic limits of USA including trust Territories</placekey>
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</place>
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<stratum>
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<stratkt>N/A</stratkt>
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<stratkey>N/A</stratkey>
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</stratum>
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<temporal>
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<tempkt>N/A</tempkt>
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<tempkey>N/A</tempkey>
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</temporal>
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</keywords>
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<accconst>
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Geodetic Data are in the public
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domain, not restricted from access or distribution.
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</accconst>
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<useconst>
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Not restricted; Geodetic Data,
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including software were developed and compiled with
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U.S. Government funding; no proprietary rights may be
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attached to them nor may they be sold to the U.S.
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Government as part of any procurement of ADP products
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or services.
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</useconst>
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<ptcontac>
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<cntinfo>
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<cntperp>
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<cntper>NGS Information Services Branch</cntper>
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<cntorg>NOAA, National Geodetic Survey</cntorg>
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</cntperp>
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<cntpos>Information Specialist</cntpos>
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<cntaddr>
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<addrtype>Mailing and Physical Address</addrtype>
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<address>
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SSMC3/9202
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1315 East-west Highway
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</address>
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<city>Silver Spring</city>
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<state>MD</state>
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<postal>20910</postal>
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<country>USA</country>
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</cntaddr>
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<cntvoice>301-713-3242</cntvoice>
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<cntfax>301-713-4172</cntfax>
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<cntemail>ngs.infocenter@noaa.gov</cntemail>
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<hours>7:00am to 4:30pm EST</hours>
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<cntinst>Prefer EMail</cntinst>
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</cntinfo>
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</ptcontac>
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<datacred>
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NOAA, National Geodetic Survey and
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cooperating organizations
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</datacred>
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<secinfo>
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<secsys>DOD</secsys>
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<secclass>unclassified</secclass>
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<sechandl>none</sechandl>
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</secinfo>
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<native>
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The data was extracted from NGS datasheets which
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are available at <http://www.ngs.noaa.gov/cgi-bin/datasheet.prl>
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The NGS datasheet is a text document which summarizes
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key geodetic information stored in the NGS database.
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</native>
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</idinfo>
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<dataqual>
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<attracc>
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<attraccr>
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Horizontal control stations (those with precise Latitude, Longitude)
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were established in accordance with FGDC publications
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"Standards and Specifications for Geodetic Accuracy Standards"
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and "Geometric Geodetic Accuracy Standards and Specifications for
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Using GPS Relative Positioning Techniques"
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The final Latitude, Longitude of these stations were determined
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by a least squares adjustments of the horizontal observations.
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Horizontal control station have Latitude, Longitudes displayed
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to 5 places and are identified by attribute POS_SRCE = 'ADJUSTED'
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Lesser quality Latitude, Longitudes may also be preset in the dataset.
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These are identified by a POS_SRCE attributes
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HD_HELD1, HD_HELD2, or SCALED.
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These lesser quality positions are described at:
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<http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED>
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Vertical control stations (those with precise Orthometric Heights)
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were established in accordance with FGDC publications
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"Standards and Specifications for Geodetic Accuracy Standards"
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The final Orthometric Height of these stations were in most cases
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determined by a least squares adjustments of the vertical observations
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but in some cases may have been keyed from old survey documents.
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Vertical control stations have Orthometric Heights displayed
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to 2 or 3 places and are identified by attribute ELEV_SRCE of
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ADJUSTED, ADJ UNCH, POSTED,READJUST,N HEIGHT,RESET,COMPUTED
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Lesser quality Orthometric Heights may also be preset in the dataset.
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These are identified by a ELEV_SRCE attributes
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GPS_OBS, VERT_ANG, H_LEVEL, VERTCON, SCALED.
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These lesser quality orthometric heights are described at:
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<http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED>
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IMPORTANT - Control stations do not always have both precise
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Latitude, Longitude AND precise Orthometric Height.
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A horizontal control station may have a orthometric
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height associated with it which is of non geodetic quality.
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These types of heights are displayed to 0, 1, or 2 decimal
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places. Worst case being off by +/- 1 meter.
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LIKEWISE - A Vertical control station may have a Latitude, Longitude
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associated with it which is of non geodetic quality.
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These types of Latitude, Longitudes are displayed to 0, 1 or 2 decimal
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places. Worst case being off by +/- 180 meter.
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Refer to <http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED>
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for a description of the various type of methods used in determining
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the Latitude, Longitude, and Orthometric Height.
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Attribute POS_CHECK and ELEV_CHECK indicate whether or not
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an observational check was made to the position and/or orthometric height.
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Care should be taken when using "No Check" coordinates.
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If attribute ELEV_SRCE = 'VERTCON' then the Orthometric Height was
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determined by applying NGS program VERTCON to an Old NGVD 29 height.
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In most areas VERTCON gives results to +/- 2 cm.
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See <http://www.ngs.noaa.gov/TOOLS/Vertcon/vertcon.html> for a more
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detailed explanation of VERTCON accuracy.
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Ellipsoid Heights are also present in the dataset.
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The ellipsoid heights consist of those determined using a precise
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geoid model, which are displayed to 2 decimal places and are considered
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good to +/- .005 meters, and those displayed to 1 decimal place and are considered
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only good to +/- .5 meters
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</attraccr>
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<qattracc>
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<attraccv>95 percent confidence level for geodetic quality data.</attraccv>
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<attracce>
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Geodetic Data are continuously being processed;
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their standards and specifications are being reviewed for next
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publication release. "Standards and Specifications for Geodetic Control Networks",
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1984 and "Geometric Geodetic Accuracy Standards
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and Specifications for Using GPS Relative
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Positioning Techniques," FGCS (formally FGCC)
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publication version 5.0 1989, are most current
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published documents.
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</attracce>
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</qattracc>
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</attracc>
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<logic>
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FGCS sponsored testing in cooperation with equipment
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manufacturers and National Institutes of Standards
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and Technology, Gaithersburg, MD 20850
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</logic>
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<complete>
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This dataset DOES NOT include destroyed marks.
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All other non-publishable marks are NOT included.
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Non-publishable criteria is available at
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<http://www.ngs.noaa.gov/cgi-bin/craigs_lib.prl?HELP_NONPUB=1>
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</complete>
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<posacc>
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<horizpa>
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<horizpar>
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The description of tests are explained in "Geometric
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Geodetic Accuracy Standards and Specifications For
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Using GPS Relative Positioning Techniques," FGCS
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(formally FGCC) publication version 5.0, 1989.
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</horizpar>
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<qhorizpa>
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<horizpav>.05 meters for highest order of accuracy</horizpav>
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<horizpae>
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Horizontal positional accuracy statements pertain
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to horizontal control stations only.
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i.e. Those with geodetic quality Latitude, Longitudes.
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Positional Accuracy explanation contained in
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"Geometric Geodetic Accuracy Standards and
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Specifications For Using GPS Relative Positioning
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Techniques," FGCS (formally FGCC) publication
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version 5.0, 1989, (See table 1, p6).
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with the exception of Order A and Order B which
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have an accuracy of as described at:
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<http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=HORZ%20ORDER>
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</horizpae>
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</qhorizpa>
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</horizpa>
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<vertacc>
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<vertaccr>
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The description of tests are explained in "Geometric Geodetic
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Accuracy Standards and Specifications for Using
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GPS Relative Positioning Techniques," FGCS
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(formally FGCC) publication version 5.0, 1989,
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(See table 1, p6).
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</vertaccr>
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<qvertpa>
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<vertaccv>.05 meter for highest order of accuracy</vertaccv>
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<vertacce>
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Vertical positional accuracy statements pertain
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to vertical control stations only.
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i.e. Those with geodetic quality Orthometric Heights.
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Orthometric Height accuracy explanation is contained in
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FGDC publication "Standards and Specifications for Geodetic Control Networks"
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with the exception of vertical control of class 0
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POSTED and READJUSTED Heights which are described at:
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<http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=VERT%20ORDER>
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Ellipsoid height accuracy explanation contained in
|
|
"Geometric Geodetic Accuracy Standards and
|
|
Specifications for Using GPS Relative Positioning
|
|
Techniques," FGCS (formally FGCC) publication
|
|
version 5.0, 1989. (see table 1, p6).
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The accuracies for ellipsoid heights are described at:
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<http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=ELLP%20ORDER>
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</vertacce>
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</qvertpa>
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</vertacc>
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</posacc>
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<lineage>
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<srcinfo>
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<srccite>
|
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<citeinfo>
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<origin>NOAA, National Geodetic Survey</origin>
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<pubdate>20190402</pubdate>
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<title>
|
|
"Input Formats and Specifications of the
|
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National Geodetic Survey Data Base" published by
|
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FGCS (formally FGCC)
|
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</title>
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<edition>latest available</edition>
|
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<geoform>diagram</geoform>
|
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<serinfo>
|
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<sername>N/A</sername>
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<issue>N/A</issue>
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</serinfo>
|
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<pubinfo>
|
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<pubplace>NOAA Campus, Silver Spring, MD</pubplace>
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<publish>NOAA, National Geodetic Survey</publish>
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</pubinfo>
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<othercit>N/A</othercit>
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<onlink><http://www.ngs.noaa.gov/FGCS/BlueBook/></onlink>
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</citeinfo>
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</srccite>
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<typesrc>paper, Web</typesrc>
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<srctime>
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<timeinfo>
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<sngdate>
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<caldate>1994</caldate>
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</sngdate>
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</timeinfo>
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<srccurr>publication date</srccurr>
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</srctime>
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<srccitea>Blue Book</srccitea>
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<srccontr>
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The geodetic data must be
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submitted in the digital formats specified in the
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FGCS (formally FGCC) publication "Input Formats
|
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and Specifications of the National Geodetic Survey
|
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Data Base" which describes the formats and
|
|
procedures for submission of data for adjustment
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and assimilation into the National Geodetic Survey
|
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Data Base. Separate volumes of this publication
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refer to horizontal (volume 1), vertical (volume
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2), and gravity (volume 3) control, and are
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available from NOAA, National Geodetic Survey,
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1315 East-West Hwy, Code N/CGS1, Silver Spring,
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MD, 20910 (1-301-713-3242). Note guidelines for
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submission of three-dimensional Global Positioning
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System (GPS) relative positioning data are
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contained in annex L to volume 1.
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</srccontr>
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</srcinfo>
|
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<procstep>
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<procdesc>
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The National Geodetic Survey
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produces geodetic data. Geodetic data comprise
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the results of geodetic surveys to determine,
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among other things, latitude, longitude, height,
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scale, and orientation control. The National
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Geodetic Survey original field survey project
|
|
observations and final reports are accessioned
|
|
into records system of the National Archives and
|
|
Records Administration of the U.S.A. These
|
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surveys provide information valuable for a variety
|
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of uses in the mapping, charting and surveying
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community.
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The NGS' final product is the geodetic data sheet.
|
|
Geodetic data sheets are comprehensive summaries
|
|
of all published information for a given
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geodetic reference point, including:
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the geographic position and/or height based on the
|
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current reference datum, condition of the survey
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mark when it was last visited, a description of
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|
where the point is located and how to reach it,
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and an explanation of the terms used in the data
|
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sheet. In support of these geodetic data, the NGS
|
|
provides software, publications, and various user
|
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services, including geodetic advisor program,
|
|
instrument calibration, surveying standards, and
|
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technical workshops.
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|
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This dataset contains certain information extracted
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from the above mentioned data sheet.
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</procdesc>
|
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<srcused>Geodetic Data</srcused>
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<procdate>Not complete</procdate>
|
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<srcprod>NOAA, National Geodetic Survey and cooperating organizations.</srcprod>
|
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<proccont>
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<cntinfo>
|
|
<cntperp>
|
|
<cntper>NGS Information Services Branch</cntper>
|
|
</cntperp>
|
|
<cntpos>Information Specialist</cntpos>
|
|
<cntaddr>
|
|
<addrtype>Mailing and Physical Address</addrtype>
|
|
<address>
|
|
SSMC3/9202
|
|
1315 East-west Highway
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|
</address>
|
|
<city>Silver Spring</city>
|
|
<state>MD</state>
|
|
<postal>20910</postal>
|
|
<country>USA</country>
|
|
</cntaddr>
|
|
<cntvoice>301-713-3242</cntvoice>
|
|
<cntfax>301-713-4172</cntfax>
|
|
<cntemail>ngs.infocenter@noaa.gov</cntemail>
|
|
<hours>9:00am to 4:30pm EST</hours>
|
|
<cntinst>Prefer EMail</cntinst>
|
|
</cntinfo>
|
|
</proccont>
|
|
</procstep>
|
|
</lineage>
|
|
</dataqual>
|
|
<spdoinfo>
|
|
<indspref>
|
|
Geodetic Data- horizontal positional datum
|
|
conversion, use program NADCON (version 2.1)
|
|
|
|
Geodetic Data - vertical positional datum
|
|
conversion, use program VERTCON (version 2.0)
|
|
|
|
These programs provide indirect spatial reference
|
|
data and are available from NOAA, National
|
|
Geodetic Survey at
|
|
<http://www.ngs.noaa.gov/PC_PROD/pc_prod.shtml>
|
|
</indspref>
|
|
<direct>point</direct>
|
|
<ptvctinf>
|
|
<sdtsterm>
|
|
<sdtstype>point</sdtstype>
|
|
<ptvctcnt>1,500,000</ptvctcnt>
|
|
</sdtsterm>
|
|
</ptvctinf>
|
|
</spdoinfo>
|
|
<spref>
|
|
<horizsys>
|
|
<geograph>
|
|
<latres>0.00001</latres>
|
|
<longres>0.00001</longres>
|
|
<geogunit>degrees, minutes, and decimal seconds</geogunit>
|
|
</geograph>
|
|
<geodetic>
|
|
<horizdn>North American Datum of 1983 (NAD 83)</horizdn>
|
|
<ellips>Geodetic Reference System 80 (GRS80)</ellips>
|
|
<semiaxis>6378137</semiaxis>
|
|
<denflat>298.26</denflat>
|
|
</geodetic>
|
|
</horizsys>
|
|
<vertdef>
|
|
<altsys>
|
|
<altdatum>
|
|
North American Vertical Datum of 1988 (NAVD 88),
|
|
including Ellipsoidal and Orthometric
|
|
Heights.
|
|
</altdatum>
|
|
<altres>.01</altres>
|
|
<altunits>meters</altunits>
|
|
<altenc>implicit coordinate</altenc>
|
|
</altsys>
|
|
<depthsys>
|
|
<depthdn>the local surface</depthdn>
|
|
<depthres>.01</depthres>
|
|
<depthdu>meters</depthdu>
|
|
<depthem>implicit coordinate</depthem>
|
|
</depthsys>
|
|
</vertdef>
|
|
</spref>
|
|
<eainfo>
|
|
<overview>
|
|
<eaover>
|
|
|
|
The current attributes and their meaning are shown below.
|
|
|
|
#FeatureId
|
|
Temporary unique ID assigned to this station.
|
|
|
|
DATA_DATE-
|
|
The date when this information was retrieved from the NGS database.
|
|
|
|
DATA_SRCE-
|
|
Data Source where the information for the mark came from.
|
|
You should use this link to obtain a full datasheet for the mark
|
|
or obtain the datasheets from http://www.ngs.noaa.gov/cgi-bin/datasheet.prl
|
|
if you intend to use the data for survey control.
|
|
|
|
DEC_LONG-
|
|
Decimal equivalent of the LONGITUDE
|
|
Always displayed to 10 decimal places, but you should
|
|
see POS_SRCE and POS_ORDER to determine the true accuracy.
|
|
|
|
DEC_LAT-
|
|
Decimal equivalent of the LATITUDE
|
|
|
|
PID-
|
|
Permanent Identifier assigned by NGS to each mark
|
|
|
|
NAME-
|
|
Station Name (a.k.a. Designation)
|
|
|
|
STATE-
|
|
State Code
|
|
|
|
COUNTY-
|
|
County Name
|
|
|
|
QUAD-
|
|
USGS Topographic Quad Map Name
|
|
|
|
LATITUDE-
|
|
Latitude in Deg-Min-Sec format
|
|
|
|
LONGITUDE-
|
|
Longitude in Deg-Min-Sec format
|
|
|
|
POS_DATUM-
|
|
Datum of the LATITUDE,LONGITUDE
|
|
Should always be NAD83
|
|
|
|
DATUM_TAG-
|
|
Datum Tag of the LATITUDE,LONGITUDE
|
|
NAD83 (1986) indicates positions on the NAD83 datum for the
|
|
North American Adjustment, completed in 1986.
|
|
NAD83 (nnnn) indicates positions on the NAD83 datum for the
|
|
North American Adjustment, but readjusted to a State High
|
|
Accuracy Reference Network (HARN) on the date shown in (nnnn).
|
|
NAD83 (CORS) indicates positions which are part of the CORS
|
|
network.
|
|
|
|
POS_SRCE-
|
|
Position Source for the LATITUDE,LONGITUDE
|
|
|
|
ADJUSTED = Least squares adjustment.
|
|
(Lat,Lon Rounded to 5 decimal places.)
|
|
|
|
HD_HELD1 = Differentially corrected hand held GPS observations.
|
|
(Lat,Lon Rounded to 2 decimal places.)
|
|
|
|
HD_HELD2 = Autonomous hand held GPS observations.
|
|
(Lat,Lon Rounded to 1 decimal places.)
|
|
|
|
SCALED = Scaled from a topographic map.
|
|
(Lat,Lon Rounded to 0 decimal places.)
|
|
|
|
ORTHO_HT-
|
|
Present if available.
|
|
The Orthometric Height in METERS indicating the height above the Geoid.
|
|
|
|
VERT_DATUM-
|
|
Datum of the ORTHO_HT
|
|
|
|
VERT_SRCE-
|
|
Vertical Source for the ORTHO_HT
|
|
|
|
ADJUSTED = Direct Digital Output from Least Squares Adjustment
|
|
of Precise Leveling.
|
|
(Rounded to 3 decimal places.)
|
|
|
|
ADJ UNCH = Manually Entered (and NOT verified) Output of
|
|
Least Squares Adjustment of Precise Leveling.
|
|
(Rounded to 3 decimal places.)
|
|
|
|
POSTED = Pre-1991 Precise Leveling Adjusted to
|
|
the NAVD 88 Network After Completion of
|
|
the NAVD 88 General Adjustment of 1991.
|
|
(Rounded to 3 decimal places.)
|
|
|
|
READJUST = Precise Leveling Readjusted as Required
|
|
by Crustal Motion or Other Cause.
|
|
(Rounded to 2 decimal places.)
|
|
|
|
N HEIGHT = Computed from Precise Leveling Connected
|
|
at Only One Published Bench Mark.
|
|
(Rounded to 2 decimal places.)
|
|
|
|
RESET = Reset Computation of Precise Leveling.
|
|
(Rounded to 2 decimal places.)
|
|
|
|
COMPUTED = Computed from Precise Leveling Using
|
|
Non-rigorous Adjustment Technique.
|
|
(Rounded to 2 decimal places.)
|
|
|
|
LEVELING = Precise Leveling Performed by Horizontal
|
|
Field Party.
|
|
(Rounded to 2 decimal places.)
|
|
|
|
H LEVEL = Level between control points not connected
|
|
to bench mark.
|
|
(Rounded to 1 decimal places.)
|
|
|
|
GPS OBS = Computed from GPS Observations.
|
|
(Rounded to 1 decimal places.)
|
|
|
|
VERT ANG = Computed from Vertical Angle Observations.
|
|
(Rounded to 1 decimal place;
|
|
If No Check, to 0 decimal places.)
|
|
|
|
SCALED = Scaled from a Topographic Map.
|
|
(Rounded to 0 decimal places.)
|
|
|
|
U HEIGHT = Unvalidated height from precise leveling
|
|
connected at only one NSRS point.
|
|
(Rounded to 2 decimal places.)
|
|
|
|
VERTCON = The NAVD 88 height was computed by applying the
|
|
VERTCON shift value to the NGVD 29 height.
|
|
(Rounded to 0 decimal places.)
|
|
|
|
ELLIP_HT-
|
|
Present if available.
|
|
The ellipsoid height in METERS referenced to GRS80 ellipsoid.
|
|
|
|
POS_ORDER-
|
|
Order of accuracy for the LATITUDE,LONGITUDE
|
|
Should be one of the following-
|
|
A,B,1,2,3
|
|
|
|
Order and class for Orders 1, 2, and 3
|
|
are defined in the Federal Geodetic Control Committee publication
|
|
"Standards and Specifications for Geodetic Control Networks".
|
|
|
|
In addition-
|
|
Order A stations have a relative accuracy of
|
|
5 mm +/- 1-10,000,000 relative to other A-order stations.
|
|
|
|
Order B stations have a relative accuracy of
|
|
8 mm +/- 1- 1,000,000 relative to other A- and B-order stations.
|
|
|
|
VERT_ORDER-
|
|
Order of accuracy for the ORTHO_HT
|
|
Should be 1,2, or 3 for Vertical Control Stations.
|
|
Will be blank for stations used for Horizontal Control only.
|
|
|
|
Also see attribute DIST_RATE which is used for some
|
|
vertical control stations.
|
|
|
|
Vertical order and class for 1, 2, and 3
|
|
are defined in the Federal Geodetic Control
|
|
Committee publication "Standards and Specifications for Geodetic
|
|
Control Networks". In addition-
|
|
|
|
Vertical control which were determined only for the purpose of
|
|
supplying a height for Horizontal Distance Reductions are
|
|
assigned an order of 3.
|
|
|
|
Class 0 is used for special cases of
|
|
orthometric vertical control as follows-
|
|
|
|
Vertical Order/Class Tolerance Factor
|
|
-------------------- ----------------
|
|
1 class 0 2.0 mm or less
|
|
2 class 0 8.4 mm or less
|
|
3 class 0 12.0 mm or less
|
|
|
|
VERT_CLASS-
|
|
Should be 0, 1, or 2
|
|
See details under ELEV_ORDER
|
|
|
|
DIST_RATE-
|
|
Distribution rate for POSTED and READJUSTED benchmarks
|
|
which do not have an Order and Class are as follows
|
|
"Posted bench marks" are vertical control points in the NGS data
|
|
base which were excluded from the NAVD 88 general adjustment.
|
|
Some of the bench marks were excluded due to large adjustment
|
|
residuals, possibly caused by vertical movement of the bench marks
|
|
during the time interval between different leveling epochs.
|
|
Adjusted NAVD 88 are computed for posted bench marks by
|
|
supplemental adjustments.
|
|
|
|
A range of mean distribution rate corrections is listed for each
|
|
posted bench mark in the data portion of the publication.
|
|
A summary table of the mean distribution rates and their codes is
|
|
listed below. The mean distribution rate corrections which were
|
|
applied to the original leveling observations is a good
|
|
indication of the usefulness of the posted bench marks' adjusted
|
|
NAVD 88 heights.
|
|
|
|
Distribution Distribution
|
|
Rate Code Rate Correction
|
|
------------ ---------------
|
|
"a" 0.0 thru 1.0 mm/km
|
|
"b" 1.1 thru 2.0 "
|
|
"c" 2.1 thru 3.0 "
|
|
"d" 3.1 thru 4.0 "
|
|
"e" 4.1 thru 8.0 "
|
|
"f" greater than 8.0 mm/km
|
|
|
|
POSTED BENCH MARKS SHOULD BE USED WITH CAUTION. As is the case for
|
|
all leveling projects, the mandatory FGCS check leveling two-mark or
|
|
three-mark tie procedure will usually detect any isolated movement
|
|
(or other problem) at an individual bench mark. Of course, regional
|
|
movement affecting all the marks equally is not detected by the two-
|
|
or three-mark tie procedure.
|
|
|
|
FIRST_RECV-
|
|
Date when the station was first monumented
|
|
or in the case of landmarks, first observed.
|
|
|
|
LAST_RECV-
|
|
Date when the station was last recovered.
|
|
|
|
LAST_COND-
|
|
Last recovered condition of the mark.
|
|
Should be one of the following-
|
|
MONUMENTED
|
|
FIRST OBSERVED
|
|
GOOD
|
|
POOR
|
|
MARK NOT FOUND
|
|
SEE DESCRIPTION
|
|
DESTROYED
|
|
|
|
LAST_RECBY-
|
|
Agency who reported the last condition of the mark.
|
|
|
|
STABILITY-
|
|
The stability of the mark may have 1 of 4 codes as indicated below-
|
|
A = MOST RELIABLE AND EXPECTED TO HOLD POSITION/ELEVATION WELL
|
|
B = PROBABLY HOLD POSITION/ELEVATION WELL
|
|
C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO SURFACE MOTION
|
|
- E.G. FROST HEAVE, ETC
|
|
D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
|
|
|
|
HT_MOD-
|
|
Designates if this site is a Height Modernization site. Y - Yes.
|
|
|
|
CORS_ID-
|
|
Continuously Operating Reference Stations (CORS) site ID.
|
|
|
|
PACS_SACS-
|
|
Designates whether this is a Primary Airport Control
|
|
Station (PACS) or Secondary Airport Control Station (SACS).
|
|
|
|
GEOID_HT-
|
|
Present if available. The geoid height in METERS referenced
|
|
to the geoid model attribute.
|
|
|
|
N_ACC_HZ-
|
|
Horizontal network accuracy at the 95 percent confidence level (cm).
|
|
|
|
N_ACC_EL-
|
|
Ellipsoid height network accuracy at the 95 percent confidence level (cm).
|
|
|
|
N_ACC_STD_N-
|
|
North component of coordinate standard deviation (latitude), used to compute horizontal network accuracy (cm).
|
|
|
|
N_ACC_STD_E-
|
|
East component of coordinate standard deviation (longitude), used to compute horizontal network accuracy (cm).
|
|
|
|
N_ACC_STD_H-
|
|
Up component of coordinate standard deviation (ellipsoid height), used to compute ellipsoid height network accuracy (cm).
|
|
|
|
N_ACC_CORR-
|
|
Correlation coefficient between north and east components of coordinate standard deviation (latitude and longitude), used to compute horizontal network accuracy (unitless).
|
|
|
|
ECEF_X-
|
|
The computed Earth-Centered, Earth-Fixed X position.
|
|
|
|
ECEF_Y-
|
|
The computed Earth-Centered, Earth-Fixed Y position.
|
|
|
|
ECEF_Z-
|
|
The computed Earth-Centered, Earth-Fixed Z position.
|
|
|
|
SPC_ZONE-
|
|
The State Plane Coordinate Zone.
|
|
|
|
SPC_NORTH-
|
|
The State Plane Coordinate Northing.
|
|
|
|
SPC_EAST-
|
|
The State Plane Coordinate Easting.
|
|
|
|
SPC_CONV-
|
|
The State Plane Coordinate Convergence Angle.
|
|
|
|
SPC_CSF-
|
|
The State Plane Coordinate Combined Scale Factor.
|
|
|
|
UTM_ZONE-
|
|
The Universal Transverse Mercator Zone.
|
|
|
|
UTM_NORTH-
|
|
The Universal Transverse Mercator Northing.
|
|
|
|
UTM_EAST-
|
|
The Universal Transverse Mercator Easting.
|
|
|
|
UTM_CONV-
|
|
The Universal Transverse Mercator Convergence Angle.
|
|
|
|
UTM_CSF-
|
|
The Universal Transverse Mercator Combined Scale Factor.
|
|
|
|
DYNAMIC_HT-
|
|
The computed dynamic height at a bench mark using the
|
|
orthometric height referenced the NAVD 88 and a gravity value.
|
|
|
|
MODELEDGRAV-
|
|
The interpolated gravity value which was used in the
|
|
NAVD 88 general adjustment.
|
|
|
|
MARKER-
|
|
Identifies the type of marker.
|
|
|
|
SETTING-
|
|
Identifies the type of setting.
|
|
|
|
STAMPING-
|
|
Identifies the stamping on the disk.
|
|
</eaover>
|
|
<eadetcit>
|
|
All values were obtained from the NGA Datasheet
|
|
available at <http://www.ngs.noaa.gov/cgi-bin/datasheet.prl>
|
|
</eadetcit>
|
|
</overview>
|
|
</eainfo>
|
|
<distinfo>
|
|
<distrib>
|
|
<cntinfo>
|
|
<cntperp>
|
|
<cntper>NGS Information Services Branch</cntper>
|
|
<cntorg>NOAA, National Geodetic Survey</cntorg>
|
|
</cntperp>
|
|
<cntpos>Information Specialist</cntpos>
|
|
<cntaddr>
|
|
<addrtype>Mailing and Physical Address</addrtype>
|
|
<address>
|
|
SSMC3/9202
|
|
1315 East-west Highway
|
|
</address>
|
|
<city>Silver Spring</city>
|
|
<state>MD</state>
|
|
<postal>20910</postal>
|
|
<country>USA</country>
|
|
</cntaddr>
|
|
<cntvoice>301-713-3242</cntvoice>
|
|
<cntfax>301-713-4172</cntfax>
|
|
<cntemail>ngs.infocenter@noaa.gov</cntemail>
|
|
<hours>9:00am to 4:30pm EST</hours>
|
|
<cntinst>Prefer EMail</cntinst>
|
|
</cntinfo>
|
|
</distrib>
|
|
<resdesc>Datasheet Shapefile</resdesc>
|
|
<distliab>The distributor does not assume liability</distliab>
|
|
<stdorder>
|
|
<digform>
|
|
<digtinfo>
|
|
<formname>ShapeFile</formname>
|
|
<formvern>1.0</formvern>
|
|
<formverd>2013</formverd>
|
|
<filedec>Download options include PC Zip and Unix compressed tar</filedec>
|
|
</digtinfo>
|
|
<digtopt>
|
|
<onlinopt>
|
|
<computer>
|
|
<networka>
|
|
<networkr><http://www.ngs.noaa.gov/cgi-bin/datasheet.prl?Explain=ShapeFiles></networkr>
|
|
</networka>
|
|
</computer>
|
|
<accinstr>Distributed through http://www.ngs.noaa.gov/cgi-bin/datasheet.prl</accinstr>
|
|
<oncomp>SUN Solaris</oncomp>
|
|
</onlinopt>
|
|
</digtopt>
|
|
</digform>
|
|
<fees>free if you retrieve it yourself</fees>
|
|
</stdorder>
|
|
</distinfo>
|
|
<metainfo>
|
|
<metd>20130513</metd>
|
|
<metc>
|
|
<cntinfo>
|
|
<cntperp>
|
|
<cntper>NGS Information Services Branch</cntper>
|
|
<cntorg>NOAA, National Geodetic Survey</cntorg>
|
|
</cntperp>
|
|
<cntpos>Information Specialist</cntpos>
|
|
<cntaddr>
|
|
<addrtype>Mailing and Physical Address</addrtype>
|
|
<address>
|
|
SSMC3/9202
|
|
1315 East-west Highway
|
|
</address>
|
|
<city>Silver Spring</city>
|
|
<state>MD</state>
|
|
<postal>20910</postal>
|
|
<country>USA</country>
|
|
</cntaddr>
|
|
<cntvoice>301-713-3242</cntvoice>
|
|
<cntfax>301-713-4172</cntfax>
|
|
<cntemail>ngs.software@noaa.gov</cntemail>
|
|
<hours>9:00am to 4:30pm EST</hours>
|
|
<cntinst>Prefer EMail</cntinst>
|
|
</cntinfo>
|
|
</metc>
|
|
<metstdn>FGDC Content Standards for Digital Geospatial Metadata</metstdn>
|
|
<metstdv>FGDC-STD-001-1998</metstdv>
|
|
<mettc>local time</mettc>
|
|
<metac>
|
|
Geodetic Data are in the public domain, not restricted
|
|
from access or distribution.
|
|
</metac>
|
|
<metuc>
|
|
not restricted;
|
|
Geodetic Data, including software were developed
|
|
and compiled with U.S. Government funding; no
|
|
proprietary rights may be attached to them nor may
|
|
they be sold to the U.S. Government as part of any
|
|
procurement of ADP products or services.
|
|
</metuc>
|
|
<metsi>
|
|
<metscs>DOD</metscs>
|
|
<metsc>unclassified</metsc>
|
|
<metshd>none</metshd>
|
|
</metsi>
|
|
<metextns>
|
|
<onlink>N/A</onlink>
|
|
<metprof>N/A</metprof>
|
|
</metextns>
|
|
</metainfo>
|
|
</metadata>
|