[mkgmap-dev] [PATCH] alpha patch (V3) for simplifying ways and reducing img sizeFrom Clinton Gladstone clinton.gladstone at googlemail.com on Sun Apr 12 21:27:16 BST 2009
On Feb 27, 2009, at 3:43 PM, Johann Gail wrote: > Ok, here follows V3 of my patch. Needs some small code cleanup but > works fine for now. Are you still working on this patch? I've tried it out on a number of maps: I could get compression levels similar to what you describe (about a 10% reduction in size). I had also hoped that this would improve display performance of the maps, but I could not detect any noticeable change. On my eTrex when I zoom out to scales of 50 or 80 km, it can take a very long time for the device to draw the map. From my observation of the way the map is drawn, it seems like the highways are drawn segment by segment. As you have stated, a perhaps more effective approach would be first to join highway segments where possible (for example by merging bridges and tunnels, neither of which are displayed by the Garmin devices), and then to apply the Douglas-Peucker algorithm to these longer segments. Do you have any idea how this could be achieved? Cheers.
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