- Those lines defining the geographic limits of the map or chart detail.
Military dictionary. 2000.
Look at other dictionaries:
Topographic map — A topographic map with contour lines … Wikipedia
border break — A cartographic technique used when it is required to extend a portion of the cartographic detail of a map or chart beyond the sheetlines into the margin … Military dictionary
sheetline — noun The edges of a map, as shown in a map index, used to define each sheets extent. The sheetlines were chosen to ensure coverage of the National Park on one sheet. See Also: neatline … Wiktionary