Working with GPS data
In this recipe, you will work with GPS data. This kind of data is typically saved in a .gpx
file. You will import a bunch of .gpx
files to PostGIS from RunKeeper, a popular social network for runners.
If you have an account on RunKeeper, you can export your .gpx
files and process them by following the instructions in this recipe. Otherwise, you can use the RunKeeper .gpx
files included in the runkeeper-gpx.zip
file located in the chp03
directory available in the code bundle for this book.
You will first create a bash
script for importing the .gpx
files to a PostGIS table, using ogr2ogr
. After the import is completed, you will try to write a couple of SQL queries and test some very useful functions, such as ST_MakeLine
to generate polylines from point geometries, ST_Length
to compute distance, and ST_Intersects
to perform a spatial join operation.
Getting ready
Extract the data/chp03/runkeeper-gpx.zip
file to working/chp03/runkeeper_gpx
. In case you haven't been through...