Hi WanMil,
> Date: Thu, 23 Feb 2012 21:38:47 +0100 > From: [email protected] > To: [email protected] > Subject: [mkgmap-dev] Idea for minor speed improvement for boundary > preprocessing > > Hi Gerd, > > boundary preprocessing takes quite a lot of time. That's not a big > problem because it's performed only by some people who publish their > results. > > But I think some speed improvements would not be bad anyhow?! Well, at least for me it is ;-) > > While preprocessing asia and america I go an idea. The area of a > boundary is splitted into the raster. But each time the complete area is > intersected to the raster. In case an area is big and/or complex > (boundary of russia, USA, canada etc.) this takes a long time. It would > be possible first to cut the area into smaller pieces (columns or rows > of the raster) and then do the final cut to the raster. Maybe this saves > time because the column or row areas should be less complex. > > What do you think? I think you are right and it should be easy to do. We just have to replace BoundarySaver.splitArea() by a another quadtree with a big bbox. I'll try it. Gerd
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