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Python Geospatial Development - Second Edition by Erik Westra

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Changing datums and projections

If you remember, in Chapter 2, GIS, we discussed that a datum is a mathematical model of the Earth's shape, while a projection is a way of translating points on the Earth's surface into points on a two-dimensional map. There are a large number of available datums and projections—whenever you are working with geospatial data, you must know which datum and which projection (if any) your data uses. If you are combining data from multiple sources, you will often have to change your geospatial data from one datum to another, or from one projection to another.

Task – change projections to combine shapefiles using geographic and UTM coordinates

In this recipe, we will work with two shapefiles that have different projections. ...

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