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How to crop large polygons in QGis

A step-by-step tutorial on how to crop large polygons to make a smaller one using the open-source GIS product, QGIS.

Using OGR2OGR to re-project a shape file

OGR2OGR is a great command line tool for GIS format conversions providing support for all the 'mainstream' formats as well as plenty of more obscure ones. It is also useful for changing the projection & coordinate system of a map layer.

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