DLG

https://www.e-education.psu.edu/natureofgeoinfo/c7_p7.html

DLG stands for Digital Line Graph.  The map above is a DLG in Pennsylvania that shows different transportation routes.  The map shows the terrain and elevation of the region which are labeled as the orange lines.  The red lines indicate land routes one can take like trails, roads, paths, and railroads. The blue lines mean flowing water of a river or a lake