Alamo Mountain Ne, NM, NE Quarter

Metadata
UUID ceca9f52-95de-4d24-9401-9b4c64192051
Application RGIS
Taxonomy geoimage
Format tif
Visibility Public
Description Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquadrangle (DOQ) is a 1-meter ground resolution, quarter-quadrangle (3.75 minutes of latitude by 3.75 minutes of longitude) image cast on the Universal Transverse Mercator projection (UTM) on the North American Datum of 1983 (NAD83). The geographic extent of the DOQ is equivalent to a quarter-quadrangle plus the overedge ranges from a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary and secondary corner points.
Location
Spatial Info
EPSG26913
Temporal Extent
Start Date2003-03-13
Map Preview
File Info
Size 142.6 MB
Added2026-03-16 15:31
Updated2026-03-16 15:31
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Source: FGDC

data_object Unified JSON code FGDC CSDGM code Dublin Core code ISO 19115
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Keywords

Theme: imageryBaseMapsEarthCover DOQ digital image map digital orthophotoquad DOQQ quarter-quadrangle orthophoto rectified photograph orthophoto 1-meter orthophoto 3.75 x 3.75 minute orthophoto aerial photograph digital orthophoto

Place: EPSG:4267 EPSG:7008 EPSG:26713 EPSG:4269 EPSG:7019 EPSG:26713 US NM ALAMO MOUNTAIN NE

Contacts
RoleNameOrganizationEmail
originator — U.S. Geological Survey (USGS) EROS Data Center (EDC) —
pointOfContact Customer Services Representative U.S. Geological Survey EROS Data Center custserv@usgs.gov
processor — Earth Data Analysis Center clearinghouse@edac.unm.edu
Constraints
Accessnone
UseNone. Acknowledgement of the U.S. Geological Survey and RGIS is appreciated in products derived from these data.
Data Quality

Logical Consistency: All DOQ header data and image file sizes are validated by Tape Validation System (TVS) software prior to archiving in the Sales Data Base. This validation procedure assures correct physical format and field values for header record elements. Logical relationships between header record elements are tested.

Completeness: All DOQ images are visually inspected for completeness to ensure that no gaps or image misplacement exists in the image area or in overedge coverage. The DOQ images may be derived by mosaicking multiple images, in order to ensure complete coverage. All DOQs are cloud free. Some clouds may (very infrequently) be encountered only in the overedge coverage. Source photography is leaf-off in deciduous vegetation regions. Void areas may exist, having a radiometric value of zero and appearing black. These voids are areas for which no photographic source is available or are the result of image transformation from other planimetric systems to the UTM projection. In the latter case, the void sliver areas are on the outside edges of the overedge area. The data set field content of each DOQ header record element is validated to assure completeness prior to archiving in the Sales Data Base.

Processing Steps:
  1. To produce a DOQ requires (1) a minimum of three ground positions that can be identified on the photograph to be rectified, (2) camera calibration parameters, such as the calibrated focal length and the coordinates of the camera fiducials, (3) a digital elevation model (DEM), and (4) a digital image produced by scanning an aerial photograph with a precise, high-resolution scanner. The digital image is rectified to generate an orthophoto by processing requirements 1 through 3 above for each image picture element (pixel), using rigorous photogrammetric equations on a computer. The finished product is a spatially accurate image with planimetric features represented in their true geographic positions.
  2. The georeferenced images were compressed using Lizard Tech MrSid software with a 1:40 compression ratio or ER Mapper Image Compressor 7.2 with a 1:15 compression ratio.