WhiteStar's Digital Raster Graphs are digitally scanned 7.5' USGS 1:24,000 topographic maps. These images can be tiled and projected into user-specified coordinate systems, making them ideal for base maps and for revising and interpreting vector cartographic features.

Data Source
WhiteStar's Digital Raster Graphs (DRG) are digitally scanned from 7.5' USGS 1:24,000 topographic maps. We also offer scanned USGS maps at 1:100,000 and 1:250,000 scales.

Enhancement
WhiteStar offers Digital Raster Graph images in MrSID® format using Lizardtech image compression technology. This process can reduce file size by 20:1 from the original GeoTIFF format, creating more manageable files without sacrificing image quality. The images can be tiled for seamless coverage and reprojected into user-specified coordinate systems.

Content
Digital Raster Graphs are delivered as geo-referenced raster images with uniform scale, map projection, and associated coordinate system.

Format
Digital Raster Graphs are currently available in the following formats:

Coverage
Nationwide coverage, available by 7.5' quadrangle.

Application
Land and parcel mapping, oil and gas exploration, pipeline mapping, telecommunications, engineering, building and development, agriculture, forestry, transportation and other government functions.