Hi Gerd,
at first the good news. In the meantime i have build maps for Czech
Republik, Germany, Austria, Switzerland and Italy, ever with 6 zoomlevels.
I don't found an error. Of course, this is no evidence for the algorithm.
And yes, there are a few mysterious things. I'm sure, what ever the garmin
programmers done, they have found a very good compression for this special
case. They don't waste a bit. But perhaps they think also to confuse all
the snoopy guys on the world. Perhaps they say: hey let us take a special
case, if the compression is not worse.
I have no idea for the 158. I belief, we can see this as parameter.
Perhaps garmin have found with trial and error, that 158 give smallest
DEM's for a lot of areas on earth. Then it is more a "statistical" reason.
By the way, the worst thing in my opinion is the rule for
"Längencodierung". It is rather a "descriptiv" solution. Perhaps behind
this is a more "mathematical theory", but i don't found it.
Frank
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