User:Moresby/Understanding Mapnik

Understanding Mapnik

A Mapnik tutorial

• Contents

Starting with Python

• Setting a background colour
• Plotting points
• Placing images at points
• Plotting lines
• Specifying line colour and width
• Specifying line styles
• Using layers to draw points and lines
• Using filters to represent data
• Adding text to the map

Using XML and CSS

• Representing map designs in XML
• Revisiting our examples in XML
• CSS styling with Cascadenik

CartoCSS and PostGIS

• Using CartoCSS
• Specifying the drawing order
• Using PostgreSQL and PostGIS
• Specifying geometry types
• The Google Maps projection
• Specifying geometry constraints

Starting with Python

Setting a background colour The absolute basics. If this works, you're ready to start. More>>
Plotting points We start by plotting some points on a map - in this case towns and cities. There's a fair bit to take in here, but it's all important. More>>
Placing images at points Now we choose a symbol to go at each point. More>>
Plotting lines We now plot some lines - in this case roads and railways. More>>
Specifying line colour and width How to specify the look of a line: colour and width. More>>
Specifying line styles For more flexibility, we can choose dotted or dashed lines. More>>
Using layers to draw points and lines Now we put the points and lines on the same map. More>>
Using filters to represent data We can choose how individual points and lines are shown, based on information about what they represent. More>>
Adding text to the map Now we can label some of the features we've added. More>>

Using XML and CSS

Representing map designs in XML Now we can label some of the features we've added. More>>

Revisiting our examples in XML Now we can label some of the features we've added. More>>

CSS styling with Cascadenik Now we can label some of the features we've added. More>>

CartoCSS and PostGIS

Using CartoCSS Now we can label some of the features we've added. More>>

Specifying the drawing order Now we can label some of the features we've added. More>>

Using PostgreSQL and PostGIS Now we can label some of the features we've added. More>>

Specifying geometry types Now we can label some of the features we've added. More>>

The Google Maps projection Now we can label some of the features we've added. More>>

Specifying geometry constraints Now we can label some of the features we've added. More>>