Split an area polygon with gvSIG

gvSIG's data editing functions are among the best I have ever encountered in a free and open source GIS software application. One of the useful command is the Split command. Here is how it works.

1. Start up gvSIG OADE 2010. Add in a polygon shape file layer, e.g. polygons.shp.
   
   The layer is displayed in the View.
   
2. In the legend, click the polygon layer.
   
   The layer is selected.
3. Select Layer | Start Editing.
   
   The legend name is highlighted in red and the command pane appears.
   
4. Select Geometry | Select. Click on the polygon.
   
   The polygon fill color changes to red and the vertex handles appear.
   
5. Select Geometry | Modify | Split.
   
   The prompt Insert first point appears in the Command pane.
6. Click a few points to digitize the splitting line.
   
   
7. To complete, type in e in the Command pane prompt. Press RETURN.
   
   The polygon is split.
   
8. Select Layer | Stop editing.
   
   You are prompted to save the edits.
9. Click Yes.
   
   The changes are saved.