David, thank you so much for your help, you solved my problem 100%. I had no idea mapserver could reproject on the fly! that is so cool. Anyway, thanks a lot.
-Adam On Fri, Nov 5, 2010 at 2:23 PM, Fawcett, David (MPCA) < [email protected]> wrote: > Adam, > > > > There was a TIGER import into OSM, but many of the ways have been edited > since the original import. > > > > From the display standpoint, the spatial reference system (SRS) of the > input data set is not very important. It is the output SRS that is > important. I think that you will want to set your output projection to > world Mercator (epsg:900913 or epsg:3785) > http://spatialreference.org/ref/epsg/3785/ > > > > If you use 900913, make sure that there is an entry in your epsg database > for it, you may need to add it. > > > > With MapServer, you can re-project on the fly, so your data doesn’t need to > be in the output SRS, but you can make your map rendering more efficient by > pre-projecting the data to the output SRS. > > > > David. > > > > *From:* Adam Eskreis [mailto:[email protected]] > *Sent:* Friday, November 05, 2010 12:12 PM > *To:* Fawcett, David (MPCA) > *Cc:* [email protected] > *Subject:* Re: [mapserver-users] Tiger line file and mapserver > > > > So would that mean that they converted the entire tiger line file to a > different projection? I will give that a try. Thank you for the > suggestion. > > On Fri, Nov 5, 2010 at 1:08 PM, Fawcett, David (MPCA) < > [email protected]> wrote: > > It could be that your data is in a geographic spatial reference system and > that the OSM tiles are in a World Mercator spatial reference system > (epsg:900913). > > > > David. > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Adam Eskreis > *Sent:* Friday, November 05, 2010 11:54 AM > *To:* [email protected] > *Subject:* [mapserver-users] Tiger line file and mapserver > > > > Hello everyone. > > I'm having a problem with the Tiger line file in mapserver that I can't > seem to work out. I am using mapserver as my backend and openlayers as my > frontend. I'm not sure if my configuration is off, but I put on the layer > in openlayers, and the angle of the lines seems to be a bit off. If you > look at, for instance, openstreetmaps.org (who also uses the tiger file) > in the area of new york city, all the blocks are perfect rectangles. > However, in my map, these same boxes seem to represent more of a shape > similar to a parallelogram with acute and obtuse angles at the corners. > > I inspected the code of openstreetmaps.org, and looked at their openlayers > code. They have something similar to this for their map declaration: > > map = new OpenLayers.Map('map', { > controls: [ > new OpenLayers.Control.PanZoomBar() > ], > units: "m", > maxResolution: "156543.0339", > numZoomLevels: 20, > displayProjection: new OpenLayers.Projection("EPSG:4326") > }); > > I tried using this on my map (which also uses the tiger file), but I cannot > get it to scale properly. On the most zoomed in level, new york city is > just a tiny dot, and if I zoom out I can't see anything. Here is my mapfile > code: > > MAP > NAME "basemap" > STATUS on > SIZE 800 600 > EXTENT -180 -90 180 90 > IMAGECOLOR 250 250 250 > IMAGETYPE 'AGGA' > CONFIG "MS_ERRORFILE" "/var/tmp/ms.log" > DEBUG 5 > WEB > METADATA > "wms_srs" "EPSG:4326" > "wms_onlineresource" " > http://mydomain.com/cgi-bin/mapserv?map=/var/www/htdocs/dev/modules/maps/basemap.map > " > END > END > PROJECTION > "init=epsg:4326" > END > > FONTSET "fonts.txt" > > OUTPUTFORMAT > NAME "AGGA" > MIMETYPE "image/png" > DRIVER "AGG/PNG" > IMAGEMODE "RGBA" > TRANSPARENT TRUE > EXTENSION "PNG" > FORMATOPTION "INTERLACE=FALSE" > END > LAYER > name lines > GROUP basemap > TYPE LINE > PROJECTION > "init=epsg:4326" > END > STATUS on > CONNECTIONTYPE postgis > CONNECTION "[removed]" > DATA "the_geom from tiger_lines" > CLASS > style > color 131 139 131 > width 24 > antialias true > end > style > color 200 200 200 > width 22 > antialias true > end > END > END > END > > Does anyone see anything that might be the reason why I cannot get my map > to scale properly using the same exact file and openlayers code as > openstreetmap.org? > > Thanks, > > -Adam > > >
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