Identify new vegetation growth
- Start gvSIG OADE. Open a map view. Load and display two polygon layers e.g. vegetation2001.shp and vegetation2011.shp.
- Select View | Geoprocessing tools.
The Geoprocessing tools dialog appears. - Expand the nodes Geoprocessing tools | Analysis | Overlay. Select Difference. Click Open Tool.
The Analysis tools dialog box appears. - In the Input layer field, choose vegetation2011.
- In the Overlay layer field, choose vegetation2001.
- In the Output layer field, type in the output file name, e.g. C:\temp\new_growth.shp.
- Click OK.
The polygons representing the new vegetation growth is created.
Identify the loss in vegetation cover
- If the Geoprocessing tools dialog is not opened, then select View | Geoprocessing tools.
The Geoprocessing tools dialog is displayed. - Expand the nodes Geoprocessing tools | Analysis | Overlay. Select Difference.
- Click Open tool.
The Analysis tools dialog box appears. - In the Input layer field, choose vegetation2001.
- In the Overlay layer field, choose vegetation2011.
- In the Output layer field, type in the output file name e.g. C:\temp\loss_of_vegetation.shp.
- Click OK.
The polygons representing the loss in vegetation cover are created.
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