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Create maps with TileMill

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gsehi.com > Computing > Problems > Create maps with TileMill

You can use TileMill to create 8-bit or 24-bit color maps.
This program is easy to download, install and use.

The easiest way to create a new project is to go to the project folder and duplicate a project folder. Then you have already a stylesheet and so.

TileMill folder

In the Projects window you can choose a project.

TileMill projects

I choose the Open Streets, DC demo project.

TileMill project

Here you can click the Export button to export the tiles.

You can also click the wrench to change the settings.

Select an area.

Export the area as an MB tiles file.
This is an SQLite file which contains tiles.

Level 17 is the highest level that I find practical.
Level 18 may be required to read names on narrow streets.

TileMill export

An important setting is Format.

24-bit PNGs are nicer, but 8-bit PNGs are faster.
On a Palm computer I see no difference in quality.

TileMill project settings

The tiles are numbered from bottom to top.

Conversion

Convert the MB tiles file to PNG files with my Python script.
Python is a language which looks like BASIC.
Python is easy to download and install, but beginners will find it difficult to use.
All you need to do is open a DOS window and change the directory to the folder of your MB tiles file and type:

python convert.py mymap.mbtiles

This script creates also an index.dat file.

© 2017 Cliff Huylebroeck