5952: Mask Land
The Mask Land option allows you to specify whether shading should appear over any areas representing land. For gridded data, CPT creates maps by shading individual grid boxes. When the gridded data represent values such as sea-surface temperatures, the shading of near-coastal grid boxes will extend over land by default. This shading can be prevented by switching on the mask land option; after producing the basic map CPT will then shade all land areas in white so that colours appear only over the sea. The option toggles the masking of the land on and off. A tick is indicated next to the menu item when the masking option is on.