Joseph, are the images you are posting a direct result of a getmap request (i.e. with width=1007&height=454), or are they a screenshot of a javascript client that is doing tiled requests to mapserver? If those are tiled requests, are your layer/class minscale/maxscale settings set to the exact values of your requested resolutions (i.e. their might be some rounding errors in that case that make a scale-dependant class appear or disappear based on floating point rounding errors).
-- thomas On 9 August 2013 19:03, Joseph Marlin <[email protected]> wrote: > The Case of the Disappearing Roads > > We create shapefiles with SQL querying world data that's been loaded into a > PostgreSQL database. A python script requests tiles from mapserver at > different zoom levels, and we generate the entire map like that. > > Now, at the sixth zoom level, level 3 roads (medium size roads) should be > rendered. However, they are actually rendered only in a small section of the > world, a box bounded by Toronto in the northwest, Cleveland in the southwest, > and the Atlantic in the east. Elsewhere, level 3 roads are not rendered at > all. > > As you can see in this image: http://i.imgur.com/6McvGOJ.png, the small gray > roads, level 3 roads, (and highway shields, for that matter) that are visible > on the top half suddenly stop being rendered by mapserver. > > In all the following more zoomed in levels, no roadways smaller than level 2 > are rendered at all anywhere, as you can see here: > http://i.imgur.com/8MTcPoi.png. I've verified that the shapefiles contain the > data on the smaller roads as I have viewed them just fine with QGIS, as you > can see here: http://i.imgur.com/S3W3Iy8.png > > I'm so confused as to what could possibly make roads disappear midway through > a level. If it was a problem with my mapfile, why would they show up in part > of Northeast US, but not anywhere else? Where do I even start looking to > solve this? > > Thanks so much! > > Additional info: > SRS: EPSG:900913 > Zoom levels: 19567.8792375, 9783.93961875, 4891.969809375, 2445.9849046875, > 1222.99245234375, 611.496226171875, 305.7481130859375, 152.87405654296876, > 76.43702827148438, 38.21851413574219, 19.109257067871095, 9.554628533935547, > 4.777314266967774, 2.388657133483887, 1.1943285667419434, > 0.5971642833709717, 0.29858214168548586 > Bounding box: -20037508.3427892,-20037508.3427892, > 20037508.3427892,20037508.3427892 > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
