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
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- 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
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- 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
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- Enumerated Domain
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- 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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are not responsible for any inaccuracies herein contained. No responsibility is assumed for damages or other liabilities due
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- Contact Organization Primary
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- Contact Organization Earth Data Analysis Center
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