| start |
back | overview | next

### Settings

Map - Advanced

On this page you can set some advanced map features.

The raw maps Cumulus uses are not projected. Therefore, they are projected on first loading. There are many types of map projections available. You need a projection because the earth is a sphere (or close to it, anyway) and your map is flat.

Cumulus supports two projections:

- Plate Carée - Equidistant Cylindrical Projection
- Lambert - Conical Orthomorphic Projection

The former is computationally simpler, and thus preferred in most situations. The latter is more complex, so your maps will take much longer to load. It is however more realistic.

Each map projection needs a basis from where to work. For the Plate Carée projection, choose a parallel close to your home base. For Lambert projection you should select should select the parallels so that they are covering the area you are flying. For example, you could choose the parallels from your official flying map. Then you will have an equal look like these maps. You should select the longitude from the middle of the area you are flying. It is needed because of some technical reasons, not for the projection itself.

After changing the projection kind or the standard parallel values, Cumulus will need to recompile your map files. Please note that: If you don't set the projection options correctly, you will likely end up with a blue screen or oddly deformed map. This is especially so if you are far away from the coordinates used in the projection. If you are on a different hemisphere, you will need to change your projection!

Cumulus can save space by deleting the original maps once they are projected. It is a good idea to do so if you don't need to adjust your projection after you initially set it. Otherwise you have to reinstall the original map files.

Cumulus supports two strategies for keeping maps in memory. Maps are only loaded if needed, but they can either stay there until they really need to be moved out of memory, or they can be removed sooner. The former stategy is more suited for users who want to zoom in and out a lot and have plenty of memory in their device, the latter stategy is to be recommended for people with lower memory devices. Check Immediately unload unneeded maps if you want to use the second strategy.

| start |
back | overview | next