Creating a new vector-mask layer

A vector-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 reuse.

To create a new vector-mask layer

In the DEM Editing window, on the Edit via Polygons toolbar, click Create Polygon Layer.
Use the editing tools to create or modify one or more polygons.
For more information, see Editing vectors.
To save the DEM Editing Polygons layer, if necessary, click Save Polygon Layer.
By default, Focus creates a temporary layer as a container for the DEM editing mask. To save a polygon mask or masks created while editing, you must save them to a new layer in a file. For more information, see Saving a mask layer.