RGIS::458f421e-1e35-4ca4-887a-8b0d0f74ab7d::ISO-19115:2003
eng; USA
IT Specialist
301-713-3257x152
301-713-4172
SSMC2/9152
1315 East-west Highway
Silver Spring
MD
20910
USA
Craig.Larrimore@noaa.gov
8:30am to 5:00pm EST
Prefer EMail
pointOfContact
2024-03-29
ISO 19115 Geographic Information - Metadata
ISO 19115
14899
New Mexico (35)
D_North_American_1983_HARN
revision
http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::6152
resourceProvider
6152
Geodetic Reference System 80
revision
http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:ellipsoid:EPSG::7019
resourceProvider
7019
North American Vertical Datum of 1988 (NAVD 88), including Ellipsoidal
and Orthometric Heights.
revision
http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:datum:EPSG::5103
resourceProvider
5103
National Geodetic Survey (NGS) Geodetic Control Stations, (Horizontal and/or Vertical Control), March 2009
2009-03-11T00:00:00
publication
Downloadable Data
NOAA, National Geodetic Survey
originator
NOAA, National Geodetic Survey
NOAA Campus
Silver Spring, MD
publisher
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.
Provide a base of reference for latitude, longitude and height throughout the
United States.
NOAA, National Geodetic Survey and cooperating organizations
IT Specialist
301-713-3257x152
301-713-4172
SSMC2/9152
1315 East-west Highway
Silver Spring
MD
20910
USA
Craig.Larrimore@noaa.gov
8:30am to 5:00pm EST
Prefer EMail
NSRS, geodetic, horizontal control, vertical control, ellipsoid height,
benchmark, orthometric height, latitude, longitude
geodesy
The geographic limits of USA including trust Territories
None
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.
eng; USA
location
Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog
9.3.1.1850
-109.056738
-103.002383
31.332258
37.0
retrieval date
2009-02-12
true
Entity and Attribute Information
http
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 All values were obtained from the NGA Datasheet available at
http://www.ngs.noaa.gov/cgi-bin/datasheet.prl
Earth Data Analysis Center
Clearinghouse Manager
505-277-3622 ext. 230
505-277-3614
MSC01 1110
1 University of New Mexico
Albuquerque
NM
87131-0001
USA
clearinghouse@edac.unm.edu
0800 - 1700 MT, M-F -7 hours GMT
distributor
None. The files are available to download from Resource Geographic Information System (RGIS) (http://rgis.unm.edu).
Contact Earth Data Analysis Center at clearinghouse@edac.unm.edu
ZIP
2
https://gstore.unm.edu/apps/rgis/datasets/458f421e-1e35-4ca4-887a-8b0d0f74ab7d/nm_control.original.zip
https://gstore.unm.edu/apps/rgis/datasets/458f421e-1e35-4ca4-887a-8b0d0f74ab7d/nm_control.original.zip
https://gstore.unm.edu/apps/rgis/datasets/458f421e-1e35-4ca4-887a-8b0d0f74ab7d/metadata/FGDC-STD-001-1998.xml
https://gstore.unm.edu/apps/rgis/datasets/458f421e-1e35-4ca4-887a-8b0d0f74ab7d/metadata/FGDC-STD-001-1998.html
https://gstore.unm.edu/apps/rgis/datasets/458f421e-1e35-4ca4-887a-8b0d0f74ab7d/metadata/ISO-19115:2003.xml
https://gstore.unm.edu/apps/rgis/datasets/458f421e-1e35-4ca4-887a-8b0d0f74ab7d/metadata/ISO-19115:2003.html
Horizontal Positional Accuracy
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
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.
.05
Vertical Positional Accuracy
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
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
.05
FGCS sponsored testing in cooperation with equipment manufacturers and National
Institutes of Standards and Technology, Gaithersburg, MD 20850
Quantitative Attribute Accuracy Assessment
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 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
95 percent confidence level for geodetic quality data.
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.
IT Specialist
301-713-3257x152
301-713-4172
SSMC2/9152
1315 East-west Highway
Silver Spring
MD
20910
USA
Craig.Larrimore@noaa.gov
8:30am to 5:00pm EST
Prefer EMail
Blue Book
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.
"Input Formats and Specifications of the National Geodetic Survey
Data Base" published by FGCS (formally FGCC)
Blue Book
2009-02-12T00:00:00
NOAA, National Geodetic Survey
publication date
1994-01-01
Earth Data Analysis Center
Clearinghouse Manager
505-277-3622 ext. 230
505-277-3614
MSC01 1110
1 University of New Mexico
Albuquerque
NM
87131-0001
USA
clearinghouse@edac.unm.edu
0800 - 1700 MT, M-F -7 hours GMT
custodian