El 07/06/13 22:59, GerdP escribió:
Hi Carlos,
Carlos Dávila-2 wrote
El 07/06/13 21:45, GerdP escribió:
Questions: 1) If a road with road_speed=4 has e.g. 10 points (= OSM nodes) , and the 3rd point has tag mkgmap:road-speed=-1 and the 8th point has tag mkgmap:road-speed=+1, what is the expected result? I would assume that the road is split into 3 parts, one containining points 1-3, one the points 3-8, and the last one the points 8-10. The 1st part would use the unchanged road_speed value 4, the 2nd part the the value 3 and the last part the value 5. (if this doesn't introduce any short arcs, else splitting makes no sense for these tags) Correct? If I recall correctly, if a node is tagged with mkgmap:road-speed it affects the portion of the way from the node before to the tagged one to the node after it, so the above example will result in section 1-2: road-speed=4, section 2-4 r-s=3, section 4-7 r-s=4, section 7-9 r-s=5 and section 9-10 r-s=4 yes, I think that is what happens. I just don't understand why it is coded like that. The default style doesn't use this feature, so I don't know how it is used. My thought was that a OSM node has some kind of speed limit tag and that is translated into a mkgmap:road-speed tag. If that is correct, I would assume that the speed limit is true as long as no new node with another one is found. Of course this assumes that all different speed limit signs are points with the corresponding tags. mkgmap:road-speed is not used for speed tags in the OSM data but for elements (nodes) that may affect the surrounding section of a way. For example, if a residential way has a node tagged traffic_calming=* you may drive at say 50 km/h most of the way, but you'll have to slow down at that point. It can be implemented in the points style file as: traffic_calming=table { add mkgmap:road-speed = '-2'; add mkgmap:road-speed-min = '1' } traffic_calming=* { add mkgmap:road-speed = '-1'; add mkgmap:road-speed-min = '1' }