Version mkgmap-r3194 was committed by gerd on Thu, 17 Apr 2014 improve LineMergeFilter: Don't merge lines for higher levels LineMerger is called with a list that contains all lines, also those which are not written at current resolution. The old versions merged all of them where possible, but only the ones with the right resolution were written to the img file. The new version skips the merge for all lines which are not written at the current resolution. This has different effects: 1) better performance (a few % faster), because the work is not done multiple times, and numbers of lines to merge are much smaller on lower resolutions (e.g. 25 instead of 250.000 at resolution 14) 2) the merging of lines for resolution > x preserved some points for resolution x which are now not preserved. This has a significant impact on output, many shapes and some lines look different. Hard to say if the new result is better. 3) the img size is a bit smaller (maybe only a few bytes)