Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC), 20070823, Coastal Bend Texas Benthic Habitat Mapping Aransas Bay (NODC Accession 0070784): NOAA's Ocean Service, Coastal Services Center (CSC), Charleston, SC.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000128
Ordinates (y-coordinates) are specified to the nearest 0.000128
Planar coordinates are specified in Meters
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000000000000000.
The flattening of the ellipsoid used is 1/298.257222096042310000.
NOAA Coastal Services Center
These data have been created as a result of the need for having geospatial data immediately available and easily accessible in order to enhance the capability of the NOAA Coastal Services Center (CSC)
Inc., Terrasurv, 20051109, REPORT OF GPS SURVEY TEXAS COASTAL AREA MAPPING.
Geomatics, Northwest, 20041111, 2004 ADS40 Digital NAIP Imagery.
Person who carried out this activity:
Horizontal accuracy of the reprocessed source imagery was verified to be better than 5 meters at 90% confidence level in accordance with National Map Accuracy Standards for a 1-meter GSD. The thematic accuracy of the habitat maps meet or exceed the minimum acceptable field/map accuracy limits which are 80% for each individual habitat type, and 85% overall for baseline benthic habitat at the SCHEME 2-digit subclass level from a "users," as well as a "producers" perspective as defined by Story and Congalton, 1986.
Accuracy assessment determined by evaluating the horizontal accuracy obtained during the aerotriangulation process for each lift for the reprocessed imagery and by field verification for the completed map product.
Compliance with the accuracy standard for the reprocessed imagery was ensured by the placement of photo identifiable ground control points and the collection of airborne GPS data. Compliance with the accuracy standard for the final map product was ensured by fieldchecks and manual editing.
For the reprocessed imagery, compliance with the accuracy standard was ensured by the placement of photoidentifiable ground control points. A total of 18 photoidentifiable ground survey points was used for the calculations. An RMS value was calculated based on the imagery reprocessed for this project by comparing the aerotriangulated X and Y coordinates. This value represents an estimate of the accuracy of the horizontal coordinate measurements in the tile expressed in meters.For the final map product Initial Map accuracy assessment was used as a tool to prioritize areas for further field examination and after field investigation to prioritize those areas where additional modeling or interpretation was needed. Error matrices showing both deterministic and fuzzy accuracies were compiled for the initial map. Based on the results compiled from the assessment, the team visit any classes exhibiting inaccuracy and addressed the classes through modeling, additional analysis or manual editing.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints: None
Users must assume responsibility to determine the usability of these data.