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starting cleanup pass

springmeyer 2012-01-09 11:31:49 -08:00
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World-population-tutorial.md

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# Tutorial 3 -- Thematic map of world population
## Step 2
## Overview
### World Population XML
This tutorial is designed to introduce a few more advanced Mapnik styling features, mainly `Rules` and `Filters`.
Note: you will need to download the [modified world borders shapefile](http://trac.mapnik.org/attachment/wiki/XMLGettingStarted/world_borders.zip).
## Step 1: data
* Note: this file is originally from [Thematic Mapping Blog](http://thematicmapping.org/downloads/world_borders.php). The version attached here is the simpler shapefile provided there with some modification made to avoid problems that occur when displaying the map in projections such as 900913/3785 (this tutorial does not use this projection so you can use the original shapefiles as well). See [ticket 308](https://github.com/mapnik/mapnik/issues/308) for details.
For this tutorial we'll use the same world borders shapefile from natural earth used for the first two tutorials. Refer to either (Tutorial 1)[GettingStartedInPython] or (Tutorial 2)[XMLGettingStarted] for details.
This script should result in a graphic like this:
[[/images/world_population_minimized.png]]
```python
#!/usr/bin/env python
import mapnik
mapfile = "population.xml"
m = mapnik.Map(1400, 600)
mapnik.load_map(m, mapfile)
bbox = mapnik.Envelope(mapnik.Coord(-180.0, -75.0), mapnik.Coord(180.0, 90.0))
m.zoom_to_box(bbox)
mapnik.render_to_file(m, 'world_population.png', 'png')
#!/usr/bin/env python
import mapnik
mapfile = "population.xml"
m = mapnik.Map(1400, 600)
mapnik.load_map(m, mapfile)
bbox = mapnik.Envelope(mapnik.Coord(-180.0, -75.0), mapnik.Coord(180.0, 90.0))
m.zoom_to_box(bbox)
mapnik.render_to_file(m, 'world_population.png', 'png')
```
And here is the xml file: