Useful links for navigation based on raster maps

Raster based GPS programs

When surfing around on the internet to collect information about creating and customizing raster maps I often used the following sites:

The application QGIS (www.qgis.org) is a very powerful GIS program. In the context of this website I used it to retrieve the calibration information in GeoPDF and GeoTIFF maps. I also used it to find projection and coordinate reference information.
The website Sawback offers a lot of information to build your own map (sawback.com).

CRS-EU (\www.crs-geo.eu) is an European library for projection and coordinate reference information.
epsg.io (www.epsg.io) is a international library for projection and coordinate reference information.

For editing maps I use of the following programs:

For stitching map tiles I often use Photofiltre 6.5.3®. The maximum size of a picture that can be edited is 10,000 by 10,000 pixels. This older version of PhotoFiltre® works without a layer structure. The program works smoothly with images up to 8000 at 8000 pixels. Above this "border" you need patience and the save function can become unstable (many interim save!). for reducing the color depth the application is less suitable (because of color cast).
Another option is to use Paint.Net®. The use of the program is more cumbersome than PhotoFiltre. From my own experience I know the maximum map size depends on the processor and memory size of your computer. With my old one (seven years old) with a Core 5i an 4 G Byte memory an image size of 150 million pixels (e.g. 12,000 by 12,000) is feasible. With a Core 7i (10th gen) and 16 G Byte a 300 to 400 million pixels is posible. The storage function remains stable. Patience, however, is a requirement when working with large images. Lowering the color depth works fine when (as the last step in creating a map) Save as PNG file (8 bit).
For adjusting the color depth XnViewMP® is a good alternative.

(Last modified: August 10. 2021)