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Python Geospatial Analysis Cookbook by Michael Diener

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Union polygons with merging (dissolving)

To demonstrate what merging is all about, we will take an example out of the NOAA weather data. It provides an awesome minute-by-minute update of Shapefiles to satisfy your desire to download data. We will look at a week's collection of weather warnings and union these warnings together, giving us the total warning area issued in this week.

A conceptual visualization of our desired results is shown here:

Union polygons with merging (dissolving)

Most of the data is located around Florida, but has some polygons near Hawaii and California. To see the original data or find new data, check out these links:

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