I have a map with two main components:
- a polygon containing a number of shapefiles; and
- a colored basemap (from ArcGIS) that covers the entirety of the polygon and beyond.
Is there a way to "gray out" the portions of the basemap that are outside the boundary of the polygon and retain the colors of the basemap within the polygon area?
My end goal is to highlight and draw the viewer's attention to the polygon.