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gvSIG-Desktop 1.10. User Manual
Clipping
Introduction
This geoprocess allows you to limit the working area of a vector layer (points, lines or polygons), and to extract an area of interest from it.
To do so, you need an “input layer” (the layer you will use to extract an area) and a “clipping layer” so that the union of the geometries included in the "clipping layer" defines the working area.
The geoprocess checks all the vector elements in the “input layer” and will calculate the intersections for the vector elements contained in the working area defined by the “clipping layer”, so that in the "result layer" only the vector elements of our working area will appear. The geometry portion that lies outside the working area will be clipped. The alphanumeric schema of the input layer remains intact.
Examples of use:
Setting up a local GIS would allow you to include national or regional maps and then to delimit the city or town as the working area.
Running the Clipping geoprocess
When the "Clip" geoprocess has been selected, the following dialogue appears.
This dialogue allows you to select which layer you wish to clip, and gives you the chance to only clip the elements which are selected in the layer.
It allows you to select which layer will be used as the clipping layer and whether you wish to use the union of all the polygons in the clipping layer as the clipping polygon or just the selected elements.
Finally, as in the case of the other geoprocesses in gvSIG's geoprocessing extension, you can define how the result layer will be saved (at present you can only save it as a shp file).
As a result of running the geoprocess, you will have a new layer in which only the geometries which came under the union of the clipping geometries have been kept.
