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EC: Contour__Grid blank
The Grid blank command is used to remove grid node data from a grid in areas not supported by original data or in areas where you do not want to display contours on a map. It assigns a no data value (-99999 is default value) to specified groups of grid nodes in a blanked grid file. Blanked grids contain the same number of grid nodes and the same grid limits as the original grid file. The grid nodes in the blanked grid are identical to the values in the original grid except in those locations where the blanking values are assigned.
1. Add a contour map and a polygon.
2. Click [Contour], then click [Grid blank].
3. Pop up [Grid blank].
4. The Grid blank command results in the creation of a new contour map.