DEM files from other sources than vfp (sonny.4lima.de)

[ogrums]

Fro DEM I normally use the vfp-files, downloaded through MC or manually in place before the first MC run.
I was curious when reading the mentioned webside and downloaded some 3" files, brought them in place for MC and ran a (clean) map generation.
It ran ok, but the map has completely distorted contour lines.

I read this in the release notes for one of the MC versions:

Beim ersten Start werden die Höhendaten in ein neues Format gebracht

Does this mean that MC is patching the .hgt-files?
Can I use the DEM-files from sonny's website and somehow make MC run the mentioned format conversion?

Regards

[Nop]

The reason is that MC assumes a certain fixed grid size for the different sources. If you replace the .hgts with a different grid size, results will be totally bonkers.

[ogrums]

Thanks.
The .hgt-files from sonny and vfp cover a 1x1 degree area and have the same size, so I assumed the geometry was ok - how do I convert them, if I know the input grid size?
Regards

[Nop]

If they are the same grid size, then you need to flip them vertically. That was also the conversion you mentioned, in order to make them compatible with the tool mkgmap.

[ogrums]

I see. Will you disclose the command to do the flipping? I assume the necessary tools might be included in the two MC downloads...

Spent most of the morning looking for information about the conversion - nothing found.
Will MC do the conversion for me if I make a virgin install, and have the DEM-files I want to test in place before I start MC?

Regards