Geodetic Control Information on Passive Marks: Horizontal and Vertical Geodetic Control Data for the United States - National
Geospatial Data Asset (NGDA) Geodetic Control Information on Passive Marks
Dataset Identification:
Resource 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.
Citation
Title Geodetic Control Information on Passive Marks: Horizontal and Vertical Geodetic Control Data for the United States - National
Geospatial Data Asset (NGDA) Geodetic Control Information on Passive Marks
publication Date
2004-01-01
Edition latest available
presentationForm
documentDigital
other Citation Details
Questions concerning this data may be addressed to the NGS Information Center (ngs.infocenter@noaa.gov)
cited responsible party
-
publisher
organisation Name
NOAA's Ocean Service, National Geodetic Survey (NGS)
Contact information
Address
, NOAA Campus, Silver Spring, MD
cited responsible party
-
originator
organisation Name
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National
Geodetic Survey (NGS)
Provide a base of reference for latitude, longitude and height throughout the United States.
Resource language:
eng; USA
Resource progress code:
completed
Resource Maintenance Information
maintenance or update frequency:
continual
Constraints on resource usage:
Constraints
Use limitation statement:
The distributor does not assume liability
Constraints on resource usage:
Legal Constraints
use constraint:
otherRestrictions
Other constraints
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.
Constraints on resource usage:
Legal Constraints
Access Constraints
otherRestrictions
Other constraints
Access Constraints: Geodetic Data are in the public domain, not restricted from access or distribution.
Constraints on resource usage:
Security Constraints
Classification
unclassified
Classification
System DOD
Handling
Description none
Spatial representation type code:
vector
Processing environment:
Native Dataset Environment: The data was extracted from NGS datasheets which are available at http://www.ngs.noaa.gov/cgi-bin/datasheet.prl
The NGS datasheet is a text document which summarizes key geodetic information stored in the NGS database.
Resource extent
Geographic Extent
Geographic Bounding Box
westBoundLongitude
-180
eastBoundLongitude
-60.953117
northBoundLatitude
71.386726
southBoundLatitude
5.330196
Temporal Extent
Credits:
NOAA, National Geodetic Survey and cooperating organizations
point of contact
-
pointOfContact
organisation Name
National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS)
position Name Chief, Information Services Branch
Contact information
Telephone
Voice (301) 713-3242
Address
1315 East West Highway, N/NGS12, Silver Spring, MD, 20910-3282
Country USA
source description
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.Source
Type: paper, Web
source citation
Title "Input Formats and Specifications of the National Geodetic Survey Data Base" published by FGCS (formally FGCC)
name Of Measure Horizontal Positional Accuracy Report
evaluation Method Description
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.
AbsoluteExternalPositionalAccuracy
name Of Measure Horizontal Positional Accuracy
measure Description
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
Horizontal Positional Accuracy Value: .05 meters for highest order of accuracy
Quantitative Result
result value .05
value Units
AbsoluteExternalPositionalAccuracy
name Of Measure Vertical Positional Accuracy Report
evaluation Method Description
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).
AbsoluteExternalPositionalAccuracy
name Of Measure Vertical Positional Accuracy
measure Description
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%20ORDEREllipsoid
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 Vertical Positional Accuracy Value:
.05 meter for highest order of accuracy
Quantitative Result
result value .05
value Units
Completeness Commission
evaluation Method Description
This dataset DOESN' T include destroyed marks. All other non-publishable marks are NOT included. Non-publishable criteria
is available athttp://www.ngs.noaa.gov/cgi-bin/craigs_lib.prl?HELP_NONPUB=1
ConceptualConsistency
measure Description
FGCS sponsored testing in cooperation with equipment manufacturers and National Institutes of Standards and Technology, Gaithersburg,
MD 20850
QuantitativeAttributeAccuracy
name Of Measure Quantitative Attribute Accuracy Assessment
measure Description
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.
evaluation Method Description
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 attributesHD_HELD1, HD_HELD2, or SCALED.These lesser quality positions are described at:http://www.ngs.noaa.gov/cgi-bin/ds_lookup.prl?Item=SCALEDVertical
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,COMPUTEDLesser quality Orthometric Heights may also be preset in the dataset.These
are identified by a ELEV_SRCE attributesGPS_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=SCALEDIMPORTANT - 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=SCALEDfor a description of the various type
of methods used in determiningthe 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 moredetailed 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 Result
result value 95 percent confidence level for geodetic quality data.
notes: This metadata was automatically generated from the FGDC Content Standards for Digital Geospatial Metadata standard (version
FGDC-STD-001-1998) using the 2015-07-24 version of the FGDC RSE to ISO 19115-2 transform.
notes: Translated from FGDC 2015-09-11T09:32:22.095-04:00
Metadata Constraints
Legal Constraints
Access Constraints
otherRestrictions
Other constraints
Metadata Access Constraints: None
Metadata Constraints
Legal Constraints
Access Constraints
otherRestrictions
Other constraints
Metadata Use Constraints: None
Metadata Constraints
Security Constraints
Classification
unclassified
Classification
System DOD
Metadata contact
-
pointOfContact
organisation Name
National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS)
position Name Chief, Information Services Branch
Contact information
Telephone
Voice (301) 713-3242
Address
1315 East West Highway, N/NGS12, Silver Spring, MD, 20910-3282
Country USA