Using WFS spatial filters
Filtering alphanumerical attributes is quite a common task. However, in a GIS application, you may also want to filter features according to geometric properties.
WFS includes a few spatial relationships that you can use to create a spatial filter. From a general point of view, you need an input shape, a relationship to be checked, and some target shapes to be filtered.
In this recipe, we use the DWITHIN spatial relationship to filter countries that are within a circular buffer.
Tip
You can find the full source code for this recipe in the code bundle available from the Packt site for this book. Look for the ch01_wfsSpatialFilter.html ...
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