October 2013
Beginner to intermediate
364 pages
8h 8m
English
Content preview from Learning Geospatial Analysis with PythonBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Performing selections
The previous subsetting example is one way to select data. There are many other ways to subset data for further analysis. In this section we'll examine some of them.
Point in polygon formula
We briefly discussed the point in polygon formula in Chapter 1, Learning Geospatial Analysis with Python as a common type of geospatial operation. You'll find it is one of the most useful formulas out there. The formula is relatively straightforward. The following function performs this check using the Ray Casting method. This method draws a line from the test point all the way through the polygon and counts the number of times it crosses the polygon boundary. If the count is even, the point is outside the polygon. If it is odd, then it's ...
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