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gvSIG-Desktop 1.1. Manual de usuario.
Manual de usuario - Extensión JCRS (gestión de Sistemas de Referencia de Coordenadas) - Transformaciones - Transformacion EPSG
These are the official seven-parameter transformation operations defined in the EPSG repository and are used when the view’s and the layer’s CRS belong to this repository. The panel for this type of transformation shows the transformations which can be applied. The source CRS is taken to be the one chosen for the layer and the target CRS is the one set in the view.
It must be taken into account that transformation operations of this kind are always carried out on base CRSs, that is to say non-projected CRSs. Consequently, if the CRS of the view or the layer is projected, the corresponding CRS base will appear in the CRS source and CRS target fields.
