Hi WanMil, WanMil wrote
Reducing the img file size is a nice subeffect. As long as I don't know for sure that spikes are not an error I would avoid to leave them in the img.
I've analysed the filters a bit more. It seems that it is better to let DouglasPeuckerFilter "see" the data that RoundCoordsFilter produces (including spikes) Ive coded a new filter that can be used to filter spikes and and points on straight lines, see attached patch. It reduces img size a little bit, but also increases run time a little bit. It is able to find obsolete points on diagonal lines, maybe that is not really needed because I only see them on vertical and horizontal lines. Gerd filter_shapes_v1.patch <http://gis.19327.n5.nabble.com/file/n5745401/filter_shapes_v1.patch> -- View this message in context: http://gis.19327.n5.nabble.com/PATCH-v1-Optimize-filters-for-shapes-tp574414... Sent from the Mkgmap Development mailing list archive at Nabble.com.