2009/2/13 D Tucny <d...@tucny.com> > Hi folks, > > Not sure when this started, but, mapnik seems to be getting layers wrong > when drawing objects... > > e.g. > > http://www.openstreetmap.org/?lat=30.297629&lon=120.155582&zoom=18&layers=B000FTF > > In this view there is a two dual carriageway primary roads that meet at a > junction at ground level (no layer tag), above the junction running north > south is a dual carriageway trunk elevated road/viaduct (layer=2), above the > primary roads, with some below the trunk and some above is a junction > consisting of a number of trunk_link roads (various layer tags) linking the > east west primary road to the trunk road... Mapnik appears to be currently > drawing all trunk_link roads below everything else, even though they are > tagged with layer tags of 1, 2 and 3 depending on which other ways they pass > over, though it's difficult to see if it's drawing them under the trunk as > there are no borders visible making it all appear to be at the same layer... > > > Similar confusion is also visible in other places where the same road > crosses other roads and there are link roads present... > e.g. > http://www.openstreetmap.org/?lat=30.27611&lon=120.16596&zoom=17&layers=B000FTF- > east west primary linked to north south trunk (bicycle flyover and > roundabout between the two) > e.g. > http://www.openstreetmap.org/?lat=30.21797&lon=120.171&zoom=17&layers=B000FTF- > No link roads present here, but, double decker bridge with primary road at > layer 1 and trunk at layer 2 rendered with the primary road above the > trunk... > e.g. > http://www.openstreetmap.org/?lat=30.27895&lon=120.19501&zoom=17&layers=B000FTFT- > Primary links roads at layer 1 overlaid by unclassified roads with no > layer tag > > osmarender seems to get it right, even if it does look a bit messy where > the different layers join... >
The cloudmade minutely mapnik also get's this right... e.g. http://matt.sandbox.cloudmade.com/?lat=30.29722&lon=120.15529&zoom=18&layers=B0 And a different area with layer issues that's not a road... http://www.openstreetmap.org/?lat=30.266499&lon=120.129264&zoom=18&layers=B000FTTT http://matt.sandbox.cloudmade.com/?lat=30.266499&lon=120.129264&zoom=18&layers=B000FTTT Showing a building with parking on much of the top, the parking area has holes using a multipolygon relation where parts of the building are taller than the parking level... d
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