Learning Geospatial Analysis with Python - Second Edition

Measuring the elevation

Using the excellent Google Chart API, we can quickly build a nice elevation profile chart showing how the elevation changes across the route:

# Build the elevation chart using the Google Charts API log.info("Creating elevation profile chart") chart = SimpleLineChart(600, 300, y_range=[min(elvs), max(elvs)]) # API quirk - you need 3 lines of data to color # in the plot so we add a line at the minimum value # twice. chart.add_data([min(elvs)]*2) chart.add_data(elvs) chart.add_data([min(elvs)]*2) # Black lines chart.set_colours(['000000']) # fill in the elevation area with a hex color chart.add_fill_range('80C65A', 1, 2) # Set up labels for the minimum elevation, halfway value, and max value elv_labels = int(round(min(elvs))), ...