Martin Simon (grenzdebil@gmail.com) wrote:
2010/6/21 aighes <h.scholland@googlemail.com>:
Thanks a lot! This was the thing I had forgotten.
Hi!
Could someone point me to some explanation of this "overlays" feature?
I'm curious about this for quite some time now, but never found anything useful about it. What is it capable of?
Have a read of http://www.cferrero.net/maps/guide_to_TYPs.html for some illustrations of using an overlays file. In brief, it lets you superimpose one way on top of another, within the same layer. Note that it is undocumented, but overlays are not restricted to one additional overlay: I currently use up to two overlays at the same time (e.g. one-way bridges).
I'm currently processing more than 5 different layers (main, maxspeed, landuse, things conflicting with the main layer like navigable areas or fences tagged to areas and oneway arrows...) with mkgmap when I rebuild my map - only to put them together into one gmapsupp.img in the end. I think doing things quicker if I needed only 2 or 3 runs. (one for all layers sharing a .TYP file?)
Is it possible to switch overlays on and off in the device, like it's possible with my current map layers?
No, this is not possible. The overlay and the underlying line are in the same layer, so if you turn the layer off, you lose both. -- Charlie