Hi everyone
I just subscribed and, as you might expect, I'm coming here with a problem. I think it's an osmosis bug, but I can't say that for sure. I find the planet.osm file completely unworkable because of its sheer size, so I used osmosis to split it into 720 more manageable parts, which I then imported into a postgis/mapserver-utils database. Looking at the result, I have lost about 2 meridian minutes of data along each meridian, one on each side of it. A couple of images explain it best: http://www.xs4all.nl/~oracle/gap_manaus.png http://www.xs4all.nl/~oracle/gap_lima.png Both Lima and Manaus lie smack on a meridian. Those bands of nothingness in the middle of densly populated cities are not the result of some conspiracy among osm data contributors. Here's the original dataset: http://osm.org/go/NNZblPk-- http://osm.org/go/N2dmLuy-- Thus, my import ate up some of the data. This is what I did in the specific part of the world where Manaus lies: --rx planet.osm \ --tee 2 \ --bp file=S-78--77.pol \ --wx S-78--77.osm \ --bp file=S-77--76.pol \ --wx S-77--76.osm These are the polygon files referenced: S-77--76.pol 1 -77.0 -90.0 -77.0 0.0 -76.0 0.0 -77.0 -90.0 END END S-78--77.pol 1 -78.0 -90.0 -78.0 0.0 -77.0 0.0 -78.0 -90.0 END END As you can see, I was just slicing meridian cake triangles from the equator to the poles. Note that the overlap between the polygons is a one-dimensional line, not an area. The resulting .osm files were imported into postgres with for i in *.osm; do osm2pgsql -d osm -a -s -v -S /usr/share/osm2pgsql/default.style \ -k -G "$i" done The osm2pgsql binary was built out of yesterday's SVN with the insert-as-modify patch at http://www.mail-archive.com/[email protected]/msg10349.html . Theoretically, my meridian gap could be caused by osmosis, by osm2pgsq, or by any of their underlying libraries. My gut feeling though is that it's caused by a rounding error in osmosis or by an accuracy error in its underlying routines. Ideas anybody? Z _______________________________________________ osmosis-dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/osmosis-dev
