DRG

A Digital Raster Graphic (DRG) is a digital raster image produced by scanning a traditional paper topographic map and georeferencing it to real-world geographic coordinates. This process enables the map to be accurately displayed, analyzed, and integrated within Geographic Information Systems (GIS). DRGs maintain the original visual details of printed maps while providing the benefits of digital mapping and spatial analysis.

These raster maps commonly include important geographic features such as roads, rivers, elevation contours, terrain information, land cover, and administrative boundaries. Because they are georeferenced, DRGs can be combined with other GIS layers, including vector datasets, satellite imagery, and aerial photographs, to support detailed spatial analysis.

DRGs are widely used in various fields, including navigation, land-use planning, environmental monitoring, emergency response, natural resource management, and geographic visualization. Their compatibility with popular GIS software makes them valuable reference layers for understanding landscapes, comparing geographic changes, and improving decision-making. By bridging the gap between traditional cartographic maps and modern digital workflows, DRGs continue to play an important role in geospatial applications.