ngs_geodetic_ctrl_stns

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Title: ngs_geodetic_ctrl_stns
Geospatial_Data_Presentation_Form: vector digital data
Description:
Abstract:
This data contains a set of geodetic control stations maintained by the National Geodetic Survey. Downloaded from National Geodetic Survey website Feb 2025. 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.Note: This data was projected to the State's standard projection/datum of UTM Zone 4, NAD 83 HARN for use in the State's GIS database, The State posts an un-projected version of the layer on its legacy site (https://planning.hawaii.gov/gis/download-gis-data-expanded/#013), or users can visit the National Geodetic Survey site directly, at https://www.ngs.noaa.gov/cgi-bin/sf_archive.prl. For additional information, please see metadata at https://files.hawaii.gov/dbedt/op/gis/data/ngs_geodetic_ctrl_stns_summary.pdf or contact Hawaii Statewide GIS Program, Office of Planning and Sustainable Development, State of Hawaii; PO Box 2359, Honolulu, Hi. 96804; (808) 587-2846; email: gis@hawaii.gov; Website: https://planning.hawaii.gov/gis.
Purpose:
Provide a base of reference for latitude, longitude and height throughout the United States. This data contains a set of geodetic control stations maintained by the National Geodetic Survey. Downloaded from National Geodetic Survey website Feb 2025. 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. Note: This data was projected to the State's standard projection/datum of UTM Zone 4, NAD 83 HARN for use in the State's GIS database, The State posts an un-projected version of the layer on its legacy site (https://planning.hawaii.gov/gis/download-gis-data-expanded/#013), or users can visit the National Geodetic Survey site directly, at https://www.ngs.noaa.gov/cgi-bin/sf_archive.prl. For additional information, please see metadata at https://files.hawaii.gov/dbedt/op/gis/data/ngs_geodetic_ctrl_stns_summary.pdf or contact Hawaii Statewide GIS Program, Office of Planning and Sustainable Development, State of Hawaii; PO Box 2359, Honolulu, Hi. 96804; (808) 587-2846; email: gis@hawaii.gov; Website: https://planning.hawaii.gov/gis.
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -178.293929
East_Bounding_Coordinate: -154.454330
North_Bounding_Coordinate: 29.808472
South_Bounding_Coordinate: 18.089050
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: NSRS
Theme_Keyword: geodetic
Theme_Keyword: horizontal control
Theme_Keyword: vertical control
Theme_Keyword: ellipsoid height
Theme_Keyword: benchmark
Theme_Keyword: orthometric height
Theme_Keyword: latitude
Theme_Keyword: longitude
Access_Constraints: None
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.
Data_Set_Credit: NOAA, National Geodetic Survey and cooperating organizations
Native_Data_Set_Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.9.1.28388
Spatial_Data_Organization_Information:
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: 3436
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: NAD 1983 HARN UTM Zone 4N
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -159.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000.0
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.0001
Ordinate_Resolution: 0.0001
Planar_Distance_Units: meter
Geodetic_Model:
Horizontal_Datum_Name: D North American 1983 HARN
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: ngs_geodetic_ctrl_stns
Attribute:
Attribute_Label: OBJECTID
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:
Attribute_Label: DATA_DATE
Attribute:
Attribute_Label: DATA_SRCE
Attribute:
Attribute_Label: PID
Attribute:
Attribute_Label: NAME
Attribute:
Attribute_Label: HT_MOD
Attribute:
Attribute_Label: CORS_ID
Attribute:
Attribute_Label: PACS_SACS
Attribute:
Attribute_Label: STATE
Attribute:
Attribute_Label: COUNTY
Attribute:
Attribute_Label: QUAD
Attribute:
Attribute_Label: LATITUDE
Attribute:
Attribute_Label: LONGITUDE
Attribute:
Attribute_Label: DEC_LAT
Attribute:
Attribute_Label: DEC_LON
Attribute:
Attribute_Label: ELLIP_HT
Attribute:
Attribute_Label: POS_DATUM
Attribute:
Attribute_Label: DATUM_TAG
Attribute:
Attribute_Label: POS_EPOCH
Attribute:
Attribute_Label: POS_SRCE
Attribute:
Attribute_Label: ORTHO_HT
Attribute:
Attribute_Label: VERT_DATUM
Attribute:
Attribute_Label: VERT_EPOCH
Attribute:
Attribute_Label: VERT_SRCE
Attribute:
Attribute_Label: GEOID_HT
Attribute:
Attribute_Label: GEOID_MOD
Attribute:
Attribute_Label: DYNAMIC_HT
Attribute:
Attribute_Label: MODEL_GRAV
Attribute:
Attribute_Label: N_ACC_HZ
Attribute:
Attribute_Label: N_ACC_EH
Attribute:
Attribute_Label: N_ACC_STDN
Attribute:
Attribute_Label: N_ACC_STDE
Attribute:
Attribute_Label: N_ACC_STDH
Attribute:
Attribute_Label: N_ACC_CORR
Attribute:
Attribute_Label: POS_ORDER
Attribute:
Attribute_Label: VERT_ORDER
Attribute:
Attribute_Label: VERT_CLASS
Attribute:
Attribute_Label: ECEF_X
Attribute:
Attribute_Label: ECEF_Y
Attribute:
Attribute_Label: ECEF_Z
Attribute:
Attribute_Label: SPC_ZONE
Attribute:
Attribute_Label: SPC_NORTH
Attribute:
Attribute_Label: SPC_EAST
Attribute:
Attribute_Label: SPC_CONV
Attribute:
Attribute_Label: SPC_CSF
Attribute:
Attribute_Label: UTM_ZONE
Attribute:
Attribute_Label: UTM_NORTH
Attribute:
Attribute_Label: UTM_EAST
Attribute:
Attribute_Label: UTM_CONV
Attribute:
Attribute_Label: UTM_CSF
Attribute:
Attribute_Label: STABILITY
Attribute:
Attribute_Label: FIRST_RECV
Attribute:
Attribute_Label: LAST_RECV
Attribute:
Attribute_Label: LAST_COND
Attribute:
Attribute_Label: LAST_RECBY
Attribute:
Attribute_Label: SAT_USE
Attribute:
Attribute_Label: MARKER
Attribute:
Attribute_Label: SETTING
Attribute:
Attribute_Label: STAMPING
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.)
ORTHO_HT- Present if available. The Orthometric Height in METERS indicating the height above the Geoid.
VERT_DATUM- Datum of the ORTHO_HT
VERT_SRCE- Vertical Source for the ORTHO_HT
ADJUSTED = Direct Digital Output from Least Squares Adjustment of Precise Leveling. (Rounded to 3 decimal places.)
ADJ UNCH = Manually Entered (and NOT verified) Output of Least Squares Adjustment of Precise Leveling. (Rounded to 3 decimal places.)
POSTED = Pre-1991 Precise Leveling Adjusted to the NAVD 88 Network After Completion of the NAVD 88 General Adjustment of 1991. (Rounded to 3 decimal places.)
READJUST = Precise Leveling Readjusted as Required by Crustal Motion or Other Cause. (Rounded to 2 decimal places.)
N HEIGHT = Computed from Precise Leveling Connected at Only One Published Bench Mark. (Rounded to 2 decimal places.)
RESET = Reset Computation of Precise Leveling. (Rounded to 2 decimal places.)
COMPUTED = Computed from Precise Leveling Using Non-rigorous Adjustment Technique. (Rounded to 2 decimal places.)
LEVELING = Precise Leveling Performed by Horizontal Field Party. (Rounded to 2 decimal places.)
H LEVEL = Level between control points not connected to bench mark. (Rounded to 1 decimal places.)
GPS OBS = Computed from GPS Observations. (Rounded to 1 decimal places.)
VERT ANG = Computed from Vertical Angle Observations. (Rounded to 1 decimal place; If No Check, to 0 decimal places.)
SCALED = Scaled from a Topographic Map. (Rounded to 0 decimal places.)
U HEIGHT = Unvalidated height from precise leveling connected at only one NSRS point. (Rounded to 2 decimal places.)
VERTCON = The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height. (Rounded to 0 decimal places.)
ELLIP_HT- Present if available. The ellipsoid height in METERS referenced to GRS80 ellipsoid.
POS_ORDER- Order of accuracy for the LATITUDE,LONGITUDE Should be one of the following- A,B,1,2,3
Order and class for Orders 1, 2, and 3 are defined in the Federal Geodetic Control Committee publication "Standards and Specifications for Geodetic Control Networks".
In addition- Order A stations have a relative accuracy of 5 mm +/- 1-10,000,000 relative to other A-order stations.
Order B stations have a relative accuracy of 8 mm +/- 1- 1,000,000 relative to other A- and B-order stations.
VERT_ORDER- Order of accuracy for the ORTHO_HT Should be 1,2, or 3 for Vertical Control Stations. Will be blank for stations used for Horizontal Control only.
Also see attribute DIST_RATE which is used for some vertical control stations.
Vertical order and class for 1, 2, and 3 are defined in the Federal Geodetic Control Committee publication "Standards and Specifications for Geodetic Control Networks". In addition-
Vertical control which were determined only for the purpose of supplying a height for Horizontal Distance Reductions are assigned an order of 3.
Class 0 is used for special cases of orthometric vertical control as follows-
Vertical Order/Class Tolerance Factor -------------------- ---------------- 1 class 0 2.0 mm or less 2 class 0 8.4 mm or less 3 class 0 12.0 mm or less
VERT_CLASS- Should be 0, 1, or 2 See details under ELEV_ORDER
DIST_RATE- Distribution rate for POSTED and READJUSTED benchmarks which do not have an Order and Class are as follows "Posted bench marks" are vertical control points in the NGS data base which were excluded from the NAVD 88 general adjustment. Some of the bench marks were excluded due to large adjustment residuals, possibly caused by vertical movement of the bench marks during the time interval between different leveling epochs. Adjusted NAVD 88 are computed for posted bench marks by supplemental adjustments.
A range of mean distribution rate corrections is listed for each posted bench mark in the data portion of the publication. A summary table of the mean distribution rates and their codes is listed below. The mean distribution rate corrections which were applied to the original leveling observations is a good indication of the usefulness of the posted bench marks' adjusted NAVD 88 heights.
Distribution Distribution Rate Code Rate Correction ------------ --------------- "a" 0.0 thru 1.0 mm/km "b" 1.1 thru 2.0 " "c" 2.1 thru 3.0 " "d" 3.1 thru 4.0 " "e" 4.1 thru 8.0 " "f" greater than 8.0 mm/km
POSTED BENCH MARKS SHOULD BE USED WITH CAUTION. As is the case for all leveling projects, the mandatory FGCS check leveling two-mark or three-mark tie procedure will usually detect any isolated movement (or other problem) at an individual bench mark. Of course, regional movement affecting all the marks equally is not detected by the two- or three-mark tie procedure.
FIRST_RECV- Date when the station was first monumented or in the case of landmarks, first observed.
LAST_RECV- Date when the station was last recovered.
LAST_COND- Last recovered condition of the mark. Should be one of the following- MONUMENTED FIRST OBSERVED GOOD POOR MARK NOT FOUND SEE DESCRIPTION DESTROYED
LAST_RECBY- Agency who reported the last condition of the mark.
STABILITY- The stability of the mark may have 1 of 4 codes as indicated below- A = MOST RELIABLE AND EXPECTED TO HOLD POSITION/ELEVATION WELL B = PROBABLY HOLD POSITION/ELEVATION WELL C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO SURFACE MOTION - E.G. FROST HEAVE, ETC D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
HT_MOD- Designates if this site is a Height Modernization site. Y - Yes.
CORS_ID- Continuously Operating Reference Stations (CORS) site ID.
PACS_SACS- Designates whether this is a Primary Airport Control Station (PACS) or Secondary Airport Control Station (SACS).
GEOID_HT- Present if available. The geoid height in METERS referenced to the geoid model attribute.
N_ACC_HZ- Horizontal network accuracy at the 95 percent confidence level (cm).
N_ACC_EL- Ellipsoid height network accuracy at the 95 percent confidence level (cm).
N_ACC_STD_N- North component of coordinate standard deviation (latitude), used to compute horizontal network accuracy (cm).
N_ACC_STD_E- East component of coordinate standard deviation (longitude), used to compute horizontal network accuracy (cm).
N_ACC_STD_H- Up component of coordinate standard deviation (ellipsoid height), used to compute ellipsoid height network accuracy (cm).
N_ACC_CORR- Correlation coefficient between north and east components of coordinate standard deviation (latitude and longitude), used to compute horizontal network accuracy (unitless).
ECEF_X- The computed Earth-Centered, Earth-Fixed X position.
ECEF_Y- The computed Earth-Centered, Earth-Fixed Y position.
ECEF_Z- The computed Earth-Centered, Earth-Fixed Z position.
SPC_ZONE- The State Plane Coordinate Zone.
SPC_NORTH- The State Plane Coordinate Northing.
SPC_EAST- The State Plane Coordinate Easting.
SPC_CONV- The State Plane Coordinate Convergence Angle.
SPC_CSF- The State Plane Coordinate Combined Scale Factor.
UTM_ZONE- The Universal Transverse Mercator Zone.
UTM_NORTH- The Universal Transverse Mercator Northing.
UTM_EAST- The Universal Transverse Mercator Easting.
UTM_CONV- The Universal Transverse Mercator Convergence Angle.
UTM_CSF- The Universal Transverse Mercator Combined Scale Factor.
DYNAMIC_HT- The computed dynamic height at a bench mark using the orthometric height referenced the NAVD 88 and a gravity value.
MODELEDGRAV- The interpolated gravity value which was used in the NAVD 88 general adjustment.
MARKER- Identifies the type of marker.
SETTING- Identifies the type of setting.
STAMPING- Identifies the stamping on the disk.
Entity_and_Attribute_Detail_Citation:
All values were obtained from the NGA Datasheet available at <http://www.ngs.noaa.gov/cgi-bin/datasheet.prl>
Metadata_Reference_Information:
Metadata_Date: 20250329
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Generated by mp version 2.9.12 on Mon Mar 31 18:15:08 2025