TCEQ Spatial Data Dictionary (Point)
Required fields for Point Spatial Data sets.
- LAT_DD - Latitude in Decimal Degrees
- Numeric (9,6) - Required Field
Value for latitude coordinate in decimal degrees. Total range is between -90 and +90. Value shall be positive for locations in the Northern Hemisphere and negative for locations in the Southern Hemisphere.
Important: Decimals must be carried out to enough places to correctly reflect the reported accuracy. Coordinates for positions meeting the agency 25-meter standard should be carried out to at least 4 decimal places.
- LONG_DD - Longitude in Decimal Degrees
- Numeric (11,6) - Required Field
Value for longitude coordinate in decimal degrees. Total range is between -180 and +180. Value shall be negative for locations in the Western Hemisphere and positive for locations in the Eastern Hemisphere.
Important: Decimals must be carried out to enough places to correctly reflect the reported accuracy. Coordinates for positions meeting the agency 25-meter standard should be carried out to at least 4 decimal places.
- HORZ_METH - Horizontal Collection Method
- String - Required Field
A code defining the method used to obtain the reported coordinates. This list will be expanded by the GIS Subcommittee as needed. Valid values include:
MAP_DIG Map Interpolation - Digital MAP_MAN Map Interpolation - Manual CEN90_BLK Census 1990 - Block Centroid CEN00_BLK Census 2000 - Block Centroid ADDMAT_INT Address Matching - Intersection ADDMAT_NUM Address Matching - House Number ADDMAT_MID Address Matching - Midpoint of Line ADDMAT_CL Address Matching - Center Line DOQ Digital Orthophoto Quarter Quads DRG Digital 7.5' USGS Topo Maps GPS_DIFF GPS - Differential Correction GPS_SURV GPS - Survey Grade Receiver SAT_LAND Satellite Imagery - LANDSAT SAT_SPOT Satellite Imagery - SPOT UNKNOWN Method Unknown
- HORZ_ACC - Horizontal Accuracy
- Numeric (7,1) - Required Field
Assessment of the horizontal accuracy of the reported latitude/longitude coordinate expressed in meters. Accuracy will depend on the method of collection, procedures and equipment used, and/or the results of any statistically valid test of similar points. Any method used to determine accuracy should be described in the metadata. A value of -9999 should be entered if accuracy cannot be determined.
- HORZ_REF - Horizontal Reference
- String - Required Field
A code that specifically describes the precise location of the coordinate within the facility. This field is especially important for facilities of large spatial extent. If the appropriate code cannot be found in the following list, the code OTHER should be entered and the HORZ_DESC field should be used to describe the location of the coordinate. Valid values include:
FAC_CEN Center of Facility FAC_NW Northwest Corner of Facility FAC_NE Northeast Corner of Facility FAC_SW Southwest Corner of Facility FAC_SE Southeast Corner of Facility FAC_ENTR Main Entrance of Facility STRUC_CEN Center of Structure/Building STRUC_NW Northwest Corner of Structure/Building STRUC_NE Northeast Corner of Structure/Building STRUC_SW Southwest Corner of Structure/Building STRUC_SE Southeast Corner of Structure/Building STRUC_ENTR Main Entrance of Structure/Building OTHER Other
- HORZ_DESC - Horizontal Description
- String(free text, 150) Optional Field
If the appropriate value cannot be found in the table of codes provided for the Horizontal Reference field, this field is to be used to describe the precise location of the coordinate within the facility.
- HORZ_DATE - Horizontal Date
- String (YYYYMMDD)
The date on which the horizontal coordinate was collected.
- HORZ_ORG - Horizontal Organization
- String - Required Field
Code representing the organization that measured the latitude/longitude. Please refer to the list of valid values to be used for this field.
- HORZ_DATUM - Horizontal Datum
- String - Required Field
Horizontal Reference Datum of the coordinates represented by the LATDD and LONGDD fields. Valid values include:
NAD27 North American Datum of 1927 NAD83 North American Datum of 1983 WGS84 World Geodetic System of 1984 UNKNOWN Horizontal Datum Unknown
- ELEVATION - Elevation
- Numeric (6,1) Optional Field
A value indicating the measured height above (or depression below) mean sea level in measured in meters. This would only be included for those locations for which the agency tracks elevation values.
- ELEV_METH - Elevation Collection Method
- String - Optional Field
A code defining the method used to obtain the reported vertical coordinates. This would only be included for those locations for which the agency tracks elevation values. Examples of valid values:
DEM_10 Digital Elevation Model - 10 Meter DEM_30 Digital Elevation Model - 30 Meter DEM_60 Digital Elevation Model - 60 Meter DEM_90 Digital Elevation Model - 90 Meter TOPO USGS 7.5-Minute Topographic Maps SURVEY Ground Survey GPS_SURV GPS - Survey Grade Receiver
Note: Elevations measured using non- survey grade
receivers are not acceptable.
- ELEV_ACC - Elevation Accuracy
- Numeric (4,1) Optional Field
Assessment of the vertical accuracy of the reported elevation expressed in meters. Accuracy will depend on the method of collection, procedures and equipment used, and/or the results of any statistically valid test of similar points. This would only be included for those locations for which the agency tracks elevation values.
- ELEV_DATUM - Elevation Datum
- String - Optional Field
Vertical Reference Datum for the elevation represented by the LATDD and LONGDD fields. This would only be included for those locations for which the agency tracks elevation values. Valid values include:
NGVD_29 National Geodetic Vertical Datum of 1929 NAVD_88 North American Vertical Datum of 1988 UNKNOWN Vertical Datum Unknown
- ELEV_ORG - Elevation Organization
- String - Optional Field
Code representing the organization that measured the elevation. This would only be included for those locations for which the agency tracks elevation values. Please refer to the list of valid values to be used for this field.
- ELEV_DATE - Elevation Date
- String (YYYYMMDD) - Optional Field
The date on which the elevation was collected. This would only be included for those locations for which the agency tracks elevation values.