Personal tools
You are here: Home gvSIG Projects gvSIG Desktop Documentation User documentation gvSIG-Desktop 1.9. User manual Manual de usuario gvSIG 1.9
gvSIG Desktop
gvSIG Desktop

Cached time 11/22/13 04:24:37 Clear cache and reload

 
Document Actions

Manual de usuario gvSIG 1.9

by Grupo gvSIG last modified 2011-04-19 16:42

The “Difference” geoprocess works with two layers, the “input layer” and the “overlay layer”. It is known as “Spatial NOT” and allows you to obtain the areas in a layer which are not present in the other layer. The geometries in both the “input layer” and the “overlay layer" must be polygons, lines or points. The alphanumerical schema of the “input layer” will remain intact in the "result layer", as in the end it gives more information about it.

diferencia-en.img/diferenciaNuevoAcceso_en.png

This geoprocess is very useful in numerous situations. For example, it can be used to complement the "Clip" geoprocess. If “Clip” allows you to exclude everything that does not belong to a geographical area under study, "Difference" allows you to do exactly the opposite; exclude a specific area from our working layer.

A useful example:

Transferring territorial jurisdiction between different governing bodies. Thus, if the national government transfers certain jurisdiction to a regional authority, it can decide to exclude the geographical area of the transfer in question from its data bases.

Get freemind document

View source document Get permanent link


Powered by Plone CMS, the Open Source Content Management System

This site conforms to the following standards: