National Geodetic Survey (NGS) Geodetic Control Stations, (Horizontal and/or Vertical Control), March 2009

Metadata from the RGIS Metadata Repository

Identification Information

Citation
Citation Information
Originator NOAA, National Geodetic Survey
Publication Date 2009-03-11
Publication Time 00:00:00
Title National Geodetic Survey (NGS) Geodetic Control Stations, (Horizontal and/or Vertical Control), March 2009
Geospatial Data Presentation Form vector digital data
Publication Information
Publication Place NOAA Campus, Silver Spring, MD
Publisher NOAA, National Geodetic Survey
Other Citation Details Questions concerning this data may be addressed to Craig Larrimore EMail - Craig.Larrimore@noaa.gov Phone - 301-713-3257 x152
Online Linkage https://gstore.unm.edu/apps/rgis/datasets/458f421e-1e35-4ca4-887a-8b0d0f74ab7d/nm_control.original.zip
Online Linkage https://gstore.unm.edu/apps/rgis/datasets/458f421e-1e35-4ca4-887a-8b0d0f74ab7d/metadata/FGDC-STD-001-1998.xml
Online Linkage https://gstore.unm.edu/apps/rgis/datasets/458f421e-1e35-4ca4-887a-8b0d0f74ab7d/metadata/FGDC-STD-001-1998.html
Online Linkage https://gstore.unm.edu/apps/rgis/datasets/458f421e-1e35-4ca4-887a-8b0d0f74ab7d/metadata/ISO-19115:2003.xml
Online Linkage https://gstore.unm.edu/apps/rgis/datasets/458f421e-1e35-4ca4-887a-8b0d0f74ab7d/metadata/ISO-19115:2003.html
Larger Work Citation
Description
Abstract This data contains a set of geodetic control stations maintained by the National Geodetic Survey. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both. The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.
Purpose Provide a base of reference for latitude, longitude and height throughout the United States.
Time Period of Content
Single Date/Time
Calendar Date 2009-02-12
Currentness Reference retrieval date
Status
Progress Complete
Maintenance and Update Frequency Continually
Spatial Domain
Bounding Coordinates
West Bounding Coordinate -109.056738
East Bounding Coordinate -103.002383
North Bounding Coordinate 37.0
South Bounding Coordinate 31.332258
Keywords
Theme
Thesaurus geodesy
Keyword NSRS, geodetic, horizontal control, vertical control, ellipsoid height, benchmark, orthometric height, latitude, longitude
Theme
Thesaurus ISO 19115 Topic Categories
Keyword location
Place
Thesaurus None
Keyword The geographic limits of USA including trust Territories
Access Constraints Geodetic Data are in the public domain, not restricted from access or distribution.
Use Constraints 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.
Point of Contact
Contact Information
Contact Person Primary
Contact Person Craig Larrimore
Contact Organization NOAA, National Geodetic Survey
Contact Organization Primary
Contact Organization
Contact Person
Contact Position IT Specialist
Contact Address
Address Type Mailing and Physical Address
Address SSMC2/9152 1315 East-west Highway
City Silver Spring
State or Province MD
Postal Code 20910
Country USA
Contact Voice Telephone 301-713-3257x152
Contact Facsimile Telephone 301-713-4172
Contact Electronic Mail Address Craig.Larrimore@noaa.gov
Hours of Service 8:30am to 5:00pm EST
Contact Instructions Prefer EMail
Data Set Credit NOAA, National Geodetic Survey and cooperating organizations
Security Information
Security Classification System DOD
Security Classification unclassified
Security Handling Description none
Native Data Set Environment Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.3.1.1850
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Data Quality Information

Attribute Accuracy Report
Report Horizontal control stations (those with precise Latitude, Longitude) were established in accordance with FGDC publications "Standards and Specifications for Geodetic Accuracy Standards" and "Geometric Geodetic Accuracy Standards and Specifications for Using GPS Relative Positioning Techniques" The final Latitude, Longitude of these stations were determined by a least squares adjustments of the horizontal observations. Horizontal control station have Latitude, Longitudes displayed to 5 places and are identified by attribute POS_SRCE = 'ADJUSTED' Lesser quality Latitude, Longitudes may also be preset in the dataset. These are identified by a POS_SRCE attributes HD_HELD1, HD_HELD2, or SCALED. These lesser quality positions are described at: http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED Vertical control stations (those with precise Orthometric Heights) were established in accordance with FGDC publications "Standards and Specifications for Geodetic Accuracy Standards" The final Orthometric Height of these stations were in most cases determined by a least squares adjustments of the vertical observations but in some cases may have been keyed from old survey documents. Vertical control stations have Orthometric Heights displayed to 2 or 3 places and are identified by attribute ELEV_SRCE of ADJUSTED, ADJ UNCH, POSTED,READJUST,N HEIGHT,RESET,COMPUTED Lesser quality Orthometric Heights may also be preset in the dataset. These are identified by a ELEV_SRCE attributes GPS_OBS, VERT_ANG, H_LEVEL, VERTCON, SCALED. These lesser quality orthometric heights are described at: http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED IMPORTANT - Control stations do not always have both precise Latitude, Longitude AND precise Orthometric Height. A horizontal control station may have a orthometric height associated with it which is of non geodetic quality. These types of heights are displayed to 0, 1, or 2 decimal places. Worst case being off by +/- 1 meter. LIKEWISE - A Vertical control station may have a Latitude, Longitude associated with it which is of non geodetic quality. These types of Latitude, Longitudes are displayed to 0, 1 or 2 decimal places. Worst case being off by +/- 180 meter. Refer to http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALED for a description of the various type of methods used in determining the Latitude, Longitude, and Orthometric Height. Attribute POS_CHECK and ELEV_CHECK indicate whether or not an observational check was made to the position and/or orthometric height. Care should be taken when using "No Check" coordinates. If attribute ELEV_SRCE = 'VERTCON' then the Orthometric Height was determined by applying NGS program VERTCON to an Old NGVD 29 height. In most areas VERTCON gives results to +/- 2 cm. See http://www.ngs.noaa.gov/TOOLS/Vertcon/vertcon.html for a more detailed explanation of VERTCON accuracy. Ellipsoid Heights are also present in the dataset. The ellipsoid heights consist of those determined using a precise geoid model, which are displayed to 2 decimal places and are considered good to +/- .005 meters, and those displayed to 1 decimal place and are considered only good to +/- .5 meters
Quantitative Attribute Accuracy Assessment
Attribute Accuracy Value 95 percent confidence level for geodetic quality data.
Attribute Accuracy Explanation Geodetic Data are continuously being processed; their standards and specifications are being reviewed for next publication release. "Standards and Specifications for Geodetic Control Networks", 1984 and "Geometric Geodetic Accuracy Standards and Specifications for Using GPS Relative Positioning Techniques," FGCS (formally FGCC) publication version 5.0 1989, are most current published documents.
Horizontal Positional Accuracy Report
Report The description of tests are explained in "Geometric Geodetic Accuracy Standards and Specifications For Using GPS Relative Positioning Techniques," FGCS (formally FGCC) publication version 5.0, 1989. .05 meters for highest order of accuracy.
Quantitative Horizontal Positional Accuracy Assessment
Horizontal Positional Accuracy Value .05
Horizontal Positional Accuracy Explanation Horizontal positional accuracy statements pertain to horizontal control stations only. i.e. Those with geodetic quality Latitude, Longitudes. Positional 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). with the exception of Order A and Order B which have an accuracy of as described at: http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=HORZ%20ORDER
Vertical Positional Accuracy Report
Report The description of tests are explained 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). .05 meters for highest order of accuracy
Quantitative Vertical Positional Accuracy Assessment
Vertical Positional Accuracy Value .05
Vertical Positional Accuracy Explanation Vertical positional accuracy statements pertain to vertical control stations only. i.e. Those with geodetic quality Orthometric Heights. Orthometric Height accuracy explanation is contained in FGDC publication "Standards and Specifications for Geodetic Control Networks" with the exception of vertical control of class 0 POSTED and READJUSTED Heights which are described at: http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=VERT%20ORDER 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). The accuracies for ellipsoid heights are described at: http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=ELLP%20ORDER
Logical Consistency Report FGCS sponsored testing in cooperation with equipment manufacturers and National Institutes of Standards and Technology, Gaithersburg, MD 20850
Completeness Report This dataset DOES NOT include destroyed marks. All other non-publishable marks are NOT included. Non-publishable criteria is available at http://www.ngs.noaa.gov/cgi-bin/craigs_lib.prl?HELP_NONPUB=1
Lineage
Source Information
Source Citation
Citation Information
Originator NOAA, National Geodetic Survey
Publication Date 2009-02-12
Publication Time
Title "Input Formats and Specifications of the National Geodetic Survey Data Base" published by FGCS (formally FGCC)
Geospatial Data Presentation Form diagram
Publication Information
Publication Place NOAA Campus, Silver Spring, MD
Publisher NOAA, National Geodetic Survey
Other Citation Details N/A
Online Linkage http://www.ngs.noaa.gov/FGCS/BlueBook/
Source Scale Denominator
Type of Source Media paper, Web
Source Time Period of Content
Source Currentness Reference publication date
Source Citation Abbreviation Blue Book
Source Contribution The geodetic data must be submitted in the digital formats specified in the FGCS (formally FGCC) publication "Input Formats and Specifications of the National Geodetic Survey Data Base" which describes the formats and procedures for submission of data for adjustment and assimilation into the National Geodetic Survey Data Base. Separate volumes of this publication refer to horizontal (volume 1), vertical (volume 2), and gravity (volume 3) control, and are available from NOAA, National Geodetic Survey, 1315 East-West Hwy, Code N/CGS1, Silver Spring, MD, 20910 (1-301-713-3242). Note guidelines for submission of three-dimensional Global Positioning System (GPS) relative positioning data are contained in annex L to volume 1.
Process Step
Process Description The National Geodetic Survey produces geodetic data. Geodetic data comprise the results of geodetic surveys to determine, among other things, latitude, longitude, height, scale, and orientation control. The National 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 surveys provide information valuable for a variety of uses in the mapping, charting and surveying community. The NGS' final product is the geodetic data sheet. Geodetic data sheets are comprehensive summaries of all published information for a given geodetic reference point, including: the geographic position and/or height based on the current reference datum, condition of the survey mark when it was last visited, a description of where the point is located and how to reach it, and an explanation of the terms used in the data sheet. In support of these geodetic data, the NGS provides software, publications, and various user services, including geodetic advisor program, instrument calibration, surveying standards, and technical workshops. This dataset contains certain information extracted from the above mentioned data sheet.
Source Used Citation Abbreviation Blue Book
Process Date Not complete
Process Time
Process Contact
Contact Information
Contact Person Primary
Contact Person Craig Larrimore
Contact Organization NOAA, National Geodetic Survey
Contact Organization Primary
Contact Organization
Contact Person
Contact Position IT Specialist
Contact Address
Address Type Mailing and Physical Address
Address SSMC2/9152 1315 East-west Highway
City Silver Spring
State or Province MD
Postal Code 20910
Country USA
Contact Voice Telephone 301-713-3257x152
Contact Facsimile Telephone 301-713-4172
Contact Electronic Mail Address Craig.Larrimore@noaa.gov
Hours of Service 8:30am to 5:00pm EST
Contact Instructions Prefer EMail
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Spatial Data Organization Information

Indirect Spatial Reference Method New Mexico (35)
Direct Spatial Reference Method Vector
Point and Vector Object Information
SDTS Terms Description
SDTS Point and Vector Object Type Entity point
Point and Vector Object Count 14899
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Spatial Reference Information

Spatial Reference
Name D_North_American_1983_HARN
Code EPSG:6152
URL http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::6152
Spatial Reference
Name Geodetic Reference System 80
Code EPSG:7019
URL http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:ellipsoid:EPSG::7019
Spatial Reference
Name North American Vertical Datum of 1988 (NAVD 88), including Ellipsoidal and Orthometric Heights.
Code EPSG:5103
URL http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:datum:EPSG::5103
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Entity and Attribute Information

Detailed Description
Entity Type
Entity Type Labelnm
Entity Type Definition xxx
Entity Type Definition Source xxx
Attribute
Attribute Label FID
Attribute Definition Internal feature number.
Attribute Definition Source ESRI
Attribute Domain Values
Unrepresentable Domain Sequential unique whole numbers that are automatically generated.
Attribute
Attribute Label Shape
Attribute Definition Feature geometry.
Attribute Definition Source ESRI
Attribute Domain Values
Unrepresentable Domain Coordinates defining the features.
Attribute
Attribute Label FeatureId
Attribute Definition Temporary unique ID assigned to this station.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain Unique number
Attribute
Attribute Label DATA_DATE
Attribute Definition The date when this information was retrieved from the NGS database.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain date
Attribute
Attribute Label DATA_SRCE
Attribute Definition 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.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain Data source
Attribute
Attribute Label DEC_LONG
Attribute Definition ecimal equivalent of the LONGITUDE Always displayed to 10 decimal places, but you should see POS_SRCE and POS_ORDER to determine the true accuracy.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain longitude
Attribute
Attribute Label DEC_LAT
Attribute Definition Decimal equivalent of the LATITUDE.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain Latitude
Attribute
Attribute Label PID
Attribute Definition Permanent Identifier assigned by NGS to each mark
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain Permanent Identifier assigned by NGS to each mark
Attribute
Attribute Label NAME
Attribute Definition Station Name (a.k.a. Designation)
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain Name
Attribute
Attribute Label STATE
Attribute Definition State Code
Attribute Definition Source NOAA
Attribute Domain Values
Codeset Domain
Codeset Name FIPS Code
Codeset Source FIPS
Attribute
Attribute Label COUNTY
Attribute Definition County Name
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain County Name
Attribute
Attribute Label QUAD
Attribute Definition USGS Topographic Quad Map Name
Attribute Definition Source USGS
Attribute Domain Values
Unrepresentable Domain Map Name
Attribute
Attribute Label LATITUDE
Attribute Definition Latitude in Deg-Min-Sec format
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain DMS Latitude
Attribute
Attribute Label LONGITUDE
Attribute Definition ongitude in Deg-Min-Sec format
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain DMS Longitude
Attribute
Attribute Label POS_DATUM
Attribute Definition Datum of the LATITUDE,LONGITUDE Should always be NAD83
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain datum
Attribute
Attribute Label DATUM_TAG
Attribute Definition Datum Tag of the LATITUDE,LONGITUDE
Attribute Definition Source NOAA
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value NAD83 (1986)
Enumerated Domain Value Definition indicates positions on the NAD83 datum for the North American Adjustment, completed in 1986
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value NAD83 (nnnn)
Enumerated Domain Value Definition 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)
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value NAD83 (CORS)
Enumerated Domain Value Definition indicates positions which are part of the CORS network.
Enumerated Domain Value Definition Source NOAA
Attribute
Attribute Label POS_SRCE
Attribute Definition Position Source for the LATITUDE,LONGITUDE
Attribute Definition Source NOAA
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value ADJUSTED
Enumerated Domain Value Definition Least squares adjustment - Lat,Lon Rounded to 5 decimal places
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value HD_HELD1
Enumerated Domain Value Definition Differentially corrected hand held GPS observations. (Lat,Lon Rounded to 2 decimal places.)
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value HD_HELD2
Enumerated Domain Value Definition Autonomous hand held GPS observations. (Lat,Lon Rounded to 1 decimal places.)
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value SCALED
Enumerated Domain Value Definition Scaled from a topographic map. (Lat,Lon Rounded to 0 decimal places.)
Enumerated Domain Value Definition Source NOAA
Attribute
Attribute Label ELEVATION
Attribute Definition Present if available. The Orthometric Height in METERS indicating the height above the Geoid.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain Elevation
Attribute
Attribute Label ELEV_DATUM
Attribute Definition Datum of the ELEVATION
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain Datum of elevation
Attribute
Attribute Label ELEV_SRCE
Attribute Definition Elevation Source for the ELEVATION
Attribute Definition Source NOAA
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value ADJUSTED
Enumerated Domain Value Definition Direct Digital Output from Least Squares Adjustment of Precise Leveling. (Rounded to 3 decimal places.)
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value ADJ UNCH
Enumerated Domain Value Definition Manually Entered (and NOT verified) Output of Least Squares Adjustment of Precise Leveling. (Rounded to 3 decimal places.)
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value POSTED
Enumerated Domain Value Definition 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.)
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value READJUST
Enumerated Domain Value Definition Precise Leveling Readjusted as Required by Crustal Motion or Other Cause. (Rounded to 2 decimal places.)
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value N HEIGHT
Enumerated Domain Value Definition Computed from Precise Leveling Connected at Only One Published Bench Mark. (Rounded to 2 decimal places.)
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value RESET
Enumerated Domain Value Definition Reset Computation of Precise Leveling. (Rounded to 2 decimal places.)
Enumerated Domain Value Definition Source NOAA
Attribute
Attribute Label ELLIP_HT
Attribute Definition Present if available. The ellipsoid height in METERS referenced to GRS80 ellipsoid.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain ellipsoid height
Attribute
Attribute Label ELLIP_SRCE
Attribute Definition Ellipsoid Ht Source for the ELLIP_HT Should always be GPS_OBS when present.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain Ellipsoid height soruce
Attribute
Attribute Label POS_ORDER
Attribute Definition Order of accuracy for the LATITUDE,LONGITUDE Should be one of the following- A,B,1,2,3
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain order of accuracy
Attribute
Attribute Label POS_CHECK
Attribute Definition Pos check
Attribute Definition Source NOAA
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value Y
Enumerated Domain Value Definition Observational Check was made for the position
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value N
Enumerated Domain Value Definition NO Observational Check was made for the positions
Enumerated Domain Value Definition Source NOAA
Attribute
Attribute Label ELEV_ORDER
Attribute Definition Elevation order of accuracy
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain Order of accuracy for the ELEVATION Should be 1,2, or 3 for Vertical Control Stations. Will be blank for stations used for Horizontal Control only.
Attribute
Attribute Label ELEV_CLASS
Attribute Definition Should be 0, 1, or 2 See details under ELEV_ORDER
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain Should be 0, 1, or 2 for Vertical Control Stations. Will be blank for stations used for Horizontal Control only.
Attribute
Attribute Label ELEV_CHECK
Attribute Definition Elevation observational check
Attribute Definition Source NOAA
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value Y
Enumerated Domain Value Definition Observational Check was made for the orthometric height
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value N
Enumerated Domain Value Definition NO Observational Check was made for the orthometric heights
Enumerated Domain Value Definition Source NOAA
Attribute
Attribute Label DIST_RATE
Attribute Definition 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.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain see definition
Attribute
Attribute Label ELLP_ORDER
Attribute Definition Order of accuracy for the ELLIP_HT Should be 1,2,3,4, or 5 if present. The following ellipsoid height order and class relative accuracy standards have not yet been adopted by the Federal Geodetic Control Subcommittee, but are currently in use by NGS- Ellipsoid Height Maximum Height Classification Difference Accuracy ------------------ ------------------- 1 class 1 0.5 (mm)/sqrt(km) 1 class 2 0.7 2 class 1 1.0 2 class 2 1.3 3 class 1 2.0 3 class 2 3.0 4 class 1 6.0 4 class 2 15.0 5 class 1 30.0 5 class 2 60.0 The ellipsoid height difference accuracy (b) is computed from a a minimally constrained correctly weighted least squares adjustment by- b = s / sqrt(d) where b = height difference accuracy s = propagated standard deviation of ellipsoid height difference in millimeters between control points obtained from the least squares adjustment. d = horizontal distance between control points in kilometers
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain see definition
Attribute
Attribute Label ELLP_CLASS
Attribute Definition Class of accuracy for ELLIP_HT Should be 1 or 2 See details under ELLP_ORDER
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain 1 or 2 See details under ELLP_ORDER
Attribute
Attribute Label FIRST_RECV
Attribute Definition Date when the station was first monumented or in the case of landmarks, first observed.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain date first monumented
Attribute
Attribute Label LAST_RECV
Attribute Definition Date when the station was last recovered.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain date last recovered
Attribute
Attribute Label LAST_COND
Attribute Definition Last recovered condition of the mark. Should be one of the following- MONUMENTED FIRST OBSERVED GOOD POOR MARK NOT FOUND SEE DESCRIPTION DESTROYED
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain last recovered condition
Attribute
Attribute Label LAST_RECBY
Attribute Definition Agency who reported the last condition of the mark.
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain agency who reported last condition
Attribute
Attribute Label SAT_USE
Attribute Definition Unknown
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain contact originator
Attribute
Attribute Label SAT_DATE
Attribute Definition Date
Attribute Definition Source NOAA
Attribute Domain Values
Unrepresentable Domain contact originator
Attribute
Attribute Label STABILITY
Attribute Definition The stability of the mark may have 1 of 4 codes as indicated below-
Attribute Definition Source NOAA
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value A
Enumerated Domain Value Definition MOST RELIABLE AND EXPECTED TO HOLD POSITION/ELEVATION WELL
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value B
Enumerated Domain Value Definition PROBABLY HOLD POSITION/ELEVATION WELL
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value C
Enumerated Domain Value Definition MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO SURFACE MOTION - E.G. FROST HEAVE, ETC
Enumerated Domain Value Definition Source NOAA
Enumerated Domain Value D
Enumerated Domain Value Definition MARK OF QUESTIONABLE OR UNKNOWN STABILITY
Enumerated Domain Value Definition Source NOAA
Overview Description
Entity and Attribute Overview 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.) ELEVATION- Present if available. The Orthometric Height in METERS indicating the height above the Geoid. ELEV_DATUM- Datum of the ELEVATION ELEV_SRCE- Elevation Source for the ELEVATION 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. ELLIP_SRCE- Ellipsoid Ht Source for the ELLIP_HT Should always be GPS_OBS when present. 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. POS_CHECK- Y=Observational Check was made for the position, N=NO Observational Check was made for the positions ELEV_ORDER- Order of accuracy for the ELEVATION 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. Elevation 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 ELEV_CLASS- Should be 0, 1, or 2 See details under ELEV_ORDER ELEV_CHECK- Y=Observational Check was made for the orthometric height, N=NO Observational Check was made for the orthometric heights VERTCONED- Y=Orthometric Height was determined by applying VERTCON to an old NGVD 29 height. N=Orthometric Height determined by observations. 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. ELLP_ORDER- Order of accuracy for the ELLIP_HT Should be 1,2,3,4, or 5 if present. The following ellipsoid height order and class relative accuracy standards have not yet been adopted by the Federal Geodetic Control Subcommittee, but are currently in use by NGS- Ellipsoid Height Maximum Height Classification Difference Accuracy ------------------ ------------------- 1 class 1 0.5 (mm)/sqrt(km) 1 class 2 0.7 2 class 1 1.0 2 class 2 1.3 3 class 1 2.0 3 class 2 3.0 4 class 1 6.0 4 class 2 15.0 5 class 1 30.0 5 class 2 60.0 The ellipsoid height difference accuracy (b) is computed from a a minimally constrained correctly weighted least squares adjustment by- b = s / sqrt(d) where b = height difference accuracy s = propagated standard deviation of ellipsoid height difference in millimeters between control points obtained from the least squares adjustment. d = horizontal distance between control points in kilometers ELLP_class- Class of accuracy for ELLIP_HT Should be 1 or 2 See details under ELLP_ORDER 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
Entity and Attribute Detail Citation All values were obtained from the NGA Datasheet available at http://www.ngs.noaa.gov/cgi-bin/datasheet.prl
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