Hello everyone.<br><br>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, <a href="http://openstreetmaps.org">openstreetmaps.org</a> (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. <br>
<br>I inspected the code of <a href="http://openstreetmaps.org">openstreetmaps.org</a>, and looked at their openlayers code. They have something similar to this for their map declaration:<br><br>map = new OpenLayers.Map('map', {<br>
controls: [<br> new OpenLayers.Control.PanZoomBar()<br> ],<br> units: "m",<br> maxResolution: "156543.0339",<br> numZoomLevels: 20,<br> displayProjection: new OpenLayers.Projection("EPSG:4326")<br>
});<br><br>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:<br>
<br>MAP<br> NAME "basemap"<br> STATUS on<br> SIZE 800 600<br> EXTENT -180 -90 180 90<br> IMAGECOLOR 250 250 250<br> IMAGETYPE 'AGGA'<br> CONFIG "MS_ERRORFILE" "/var/tmp/ms.log"<br>
DEBUG 5<br> WEB<br> METADATA<br> "wms_srs" "EPSG:4326"<br> "wms_onlineresource" "<a href="http://mydomain.com/cgi-bin/mapserv?map=/var/www/htdocs/dev/modules/maps/basemap.map">http://mydomain.com/cgi-bin/mapserv?map=/var/www/htdocs/dev/modules/maps/basemap.map</a>"<br>
END<br> END<br> PROJECTION<br> "init=epsg:4326"<br> END<br> <br> FONTSET "fonts.txt"<br><br> OUTPUTFORMAT<br> NAME "AGGA"<br> MIMETYPE "image/png" <br> DRIVER "AGG/PNG"<br>
IMAGEMODE "RGBA"<br> TRANSPARENT TRUE<br> EXTENSION "PNG"<br> FORMATOPTION "INTERLACE=FALSE"<br> END<br> LAYER<br> name lines<br> GROUP basemap<br> TYPE LINE<br> PROJECTION<br>
"init=epsg:4326"<br> END<br> STATUS on<br> CONNECTIONTYPE postgis<br> CONNECTION "[removed]"<br> DATA "the_geom from tiger_lines"<br> CLASS<br> style<br> color 131 139 131<br>
width 24<br> antialias true<br> end<br> style<br> color 200 200 200<br> width 22<br> antialias true<br> end<br> END<br> END<br>END<br><br>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 <a href="http://openstreetmap.org">openstreetmap.org</a>? <br>
<br>Thanks,<br><br>-Adam<br><br>