elevation contour lines
A design, usually in the background, mimicking the contour lines of topographic maps used to delineate altitude changes.
The lines on topographic maps.
What is a Topographic Map? USGS
A design, usually in the background, mimicking the contour lines of topographic maps used to delineate altitude changes.
The lines on topographic maps.
What is a Topographic Map? USGS
