The following are the products that we use in the mapmaking process.
- Topographic Maps (paper)
primary series topographic quadrangle maps (7.5 minute - 1:24,000,
1:25,000, 1:20,000; 7.5 x 15 minute - 1:25,000; and 1:63,360 scales)
- Topographic Maps (DRG)
A digital raster graphic (DRG) is a scanned image
of a U.S. Geological Survey (USGS) standard series topographic map, including all map collar information. The image
inside the map neatline is georeferenced to the surface of the earth
and fit to the Universal Transverse Mercator projection. The
horizontal positional accuracy and datum of the DRG matches the
accuracy and datum of the source map. The map is scanned at a minimum
resolution of 250 dots per inch. If needed, we remove the collar
information and mosaic (make seamless) all DRG's used.
- Digital Orthophoto Quadrangle (DOQ)
A digital orthophoto quadrangle (DOQ) is a computer-generated
image of an aerial photograph that has been orthorectified -- altered
so that it has the geometric properties of a map. If needed, we
mosaic (make seamless) all DOQ's used.