Please, forgive my 2 cents on this:

Depending on which projection each system is using, distance calculation may (and usually) differ by that much and maybe more. As far as I know, Google uses a Mercator-like projection on a spherical Earth model, which is not correct since Google coordinates refer to the WGS-84 ellipsoid. So you can expect differences, greater with higher latitudes.

So don't use Google as an accurate reference.

all the best,

Paulo

2014-02-20 17:23 GMT-03:00 WanMil <wmgcnfg@web.de>:

Hi Gerd,

which difference do you expect regarding the indirect links? I want to get an idea what I should check on my device.

I have compiled a map using the patch and it seems that distances are slightly underestimated.
One example: The distance between Hambug, An der Alster and Munich, Maximiliansplatz:
MapSource: 776km
Google Maps: 788km
Both use the same route.

I didn't notice it before.

WanMil

Hi all,

attached is a patch for r3065 in the high-prec-coord branch.

It should improve long distance routing, as it adds additional
arcs from minor roads to major roads (so called indirect links).
Maybe the improvement is only seen on the device.

It would be great to hear some test results (good or bad),
compared to trunk r3057 and compared to r3065.

A compiled binary is here:
|http://files.mkgmap.org.uk/download/179/mkgmap.jar

|Gerd

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