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context help for projection selector
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|<h3>Coordinate Reference System Selector</h3>|
|The Coordinate Reference System Selector allows you to set the projection for|
|the current layer.|
|You can find a coordinate system by entering its name, EPSG code or the QGIS ID|
|and clicking the <label>Find</label> button. The list of recently used|
|coordinate systems will be available on the bottom for quick access.|
|When operating across layers, for example, computing intersections between|
|two layers, it is important that both layers have the same CRS. To change the|
|projection of an existing layer, it is insufficient to simply change the CRS|
|in that layer's properties. Instead you must save the layer as a new layer,|
|and choose the desired CRS for the new layer.|