Creating a new bitmap-mask layer

A bitmap-mask layer is a polygon layer that identifies specific areas to edit. You can apply various operations to update the values of the digital elevation model (DEM) covered by the mask. In the DEM Editing window, you can save the working-mask layer for later re-use.

To create a new bitmap-mask layer

In the DEM Editing window, on the Edit via Bitmap toolbar, click Create Mask Layer.
Focus displays the new mask layer.
Use the Edit Mask Layer tools to digitize areas of the DEM that you want to edit.
To save the bitmap-mask layer, click Save.
By default, Focus creates a temporary layer to hold the DEM editing mask. To save the masks created while editing, you must save them to a new layer in a file. For more information, see Saving a mask layer.