Digital Raster Graphic (DRG) or "raster" for short, is a
powerful feature of GIS Pro. Technically speaking the basemap
qualifies as raster data but for the purposes of this
documentation it refers to bitmap images that are drawn over the
top of the map. Currently the most popular bitmap image formats
are supported, namely PNG, JPEG, BMP, and TIFF. In order to
properly draw raster overlays they must be geolocated. This is
done upon import and remains with the image in the form of three
or more tie points that link specific points on the image to
points on the map. There are currently four ways to geolocate an
image in GIS Pro: World file - A World file is a plain text file
that accompanies an image and is named by a naming convention to
associate it to the image. There are two naming conventions that
are supported: 1) append a "w" to the image file's extension
(example: house.jpg+house.jpgw), and 2) replace the second
letter of the image file's extension with a "w" (example:
house.jpg+house.jwg). The latter is