I have data:
where postal code is a postal code in Poland, and value is a number (it can be number of people, density, temperature etc.).
I want to create a map for this data. So I need a map with areas coloured depending of a value. Something like this here. So such data exists somewhere.
- How can I get data that I can use to draw the map of Poland divided into areas with their postal code? Where can I find it?
- What software can I use to do this?
- If this is not a proper place for such question, where can I ask?