TCityData.iMapPos calculation

[treibsand]

Hi,
in the TCityData class from the RWorldServer is a member called iMapPos.
This is the position of the city in the currently used worldmap.
It is calculated from the longitute and latitude coordinates in the same class.

Does someone know how to calculate it ?
Looks like a mercator projection, but then the database values are really bad.
Often 2 or 5 pixel off.

Thanks.

[treibsand]

There should be a script or small program, which generates the world database
"Wld_iso.dbz" or "wld_data.dbz".

Does someone know more about the internals ?