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Table Of Contents
Python Geospatial Development - Second Edition - Second Edition
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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.
In this recipe, we will work with two shapefiles that have different projections. We haven't yet encountered any geospatial data that uses a projection—all the data we've seen so far uses geographic (unprojected) latitude and longitude values. So let's start by downloading some geospatial data in Universal Transverse Mercator...
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