Digital Raster Graphic (DRG) image of U.S. Geological Survey standard series topographic map of Rincon, Puerto Rico (rincon_drg.tif)

The Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic map including the collar information, georeferenced to the UTM grid. This version of...数字栅格地图（Digital Raster Graphic，DRG）是经扫描获取的美国地质调查局（United States Geological Survey，USGS）地形图的栅格影像，包含图廓整饰信息，且已完成地理配准至通用横轴墨卡托（Universal Transverse Mercator，UTM）网格。该版本的……