Can't notice any difference to v1. BTW - Is it possible that there is a difference with the douglas peucker filter whether a road is routable or not? I think it is possible that non routable ways are smoothed heftier than routable ways. This has nothing to do with this patch though, but the difference only seems to become really visible on resolution <20 (maybe resolution 24 is filtered if not routable, but not filtered if routable. Then the more filtering is applied on each successive level, the bigger the difference). Also I noticed that cgpsmapper maps, seem to have much higher smoothing at lower resolutions compared to mkgmap (using 2.6). At resolution 24 and 22 it seem to be mostly identical though. Maybe we could also increase the douglas peucker severity on resolution <20 compared to right now. Even with very few lines mkgmap maps seem slow on GPS on resolution 16 or 18. Mark Burton wrote:
v2 - also removes points with the same coordinates as the previous point. I know that this also gets done by the DP filter but it's very easy to do while rounding the coordinates and it does shrink the number of points to be processed by subsequent filters. This version of the patch should produce the same map as v1 of the patch.
Unless anyone has any problems with this patch, I intend to commit it in a few days as I think the line gap-filling is worthwhile.
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Having filled some gaps with that last little patch, I was wondering why I still had quite a few gaps when zoomed out. Obviously, the coords weren't being rounded to nearest given the zoom level. So, the attached patch does that rounding and, lo and behold, even more gaps have disappeared.
Please give it a go, especially for maps that cross the equator/day line where the coords flip signs. Sure to be buggy but it's looking quite promising.
BTW - this patch does not contain the last patch but they probably should be used together.
Mark
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