Global Mapper SDK
The GM_CropLayerCollar function allows users to enable and disable the automatic cropping of the collar off of previously loaded USGS DRG and DOQQ quads.
This function is deprecated. You should use the GM_GetRasterDisplayOptions and GM_SetRasterDisplayOptions functions as they offer the collar cropping option as well as several additional display options.
Syntax
C++
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GM_Error_t32 GM_CropLayerCollar
(
GM_LayerHandle_t32 aLayer, // Layer to crop collar from
boolean aCropCollar // Crop the collar? (TRUE or FALSE)
);