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.<br><br>-Adam<br><br><div class="gmail_quote">On Fri, Nov 5, 2010 at 2:23 PM, Fawcett, David (MPCA) <span dir="ltr"><<a href="mailto:David.Fawcett@state.mn.us">David.Fawcett@state.mn.us</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div link="blue" vlink="purple" lang="EN-US">
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Adam, </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">There was a TIGER import into OSM, but many of the ways have
been edited since the original import. </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">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) <a href="http://spatialreference.org/ref/epsg/3785/" target="_blank">http://spatialreference.org/ref/epsg/3785/</a></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">If you use 900913, make sure that there is an entry in your epsg
database for it, you may need to add it.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">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.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">David.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> Adam Eskreis
[mailto:<a href="mailto:aeskreis@gmail.com" target="_blank">aeskreis@gmail.com</a>] <br>
<b>Sent:</b> Friday, November 05, 2010 12:12 PM<br>
<b>To:</b> Fawcett, David (MPCA)<br>
<b>Cc:</b> <a href="mailto:mapserver-users@lists.osgeo.org" target="_blank">mapserver-users@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [mapserver-users] Tiger line file and mapserver</span></p>
</div><div><div></div><div class="h5">
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom: 12pt;">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.</p>
<div>
<p class="MsoNormal">On Fri, Nov 5, 2010 at 1:08 PM, Fawcett, David (MPCA) <<a href="mailto:David.Fawcett@state.mn.us" target="_blank">David.Fawcett@state.mn.us</a>>
wrote:</p>
<div>
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">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).</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">David. </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<div style="border-width: 1pt medium medium; border-style: solid none none; padding: 3pt 0in 0in; border-color: -moz-use-text-color;">
<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> <a href="mailto:mapserver-users-bounces@lists.osgeo.org" target="_blank">mapserver-users-bounces@lists.osgeo.org</a>
[mailto:<a href="mailto:mapserver-users-bounces@lists.osgeo.org" target="_blank">mapserver-users-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>Adam Eskreis<br>
<b>Sent:</b> Friday, November 05, 2010 11:54 AM<br>
<b>To:</b> <a href="mailto:mapserver-users@lists.osgeo.org" target="_blank">mapserver-users@lists.osgeo.org</a><br>
<b>Subject:</b> [mapserver-users] Tiger line file and mapserver</span></p>
</div>
<div>
<div>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom: 12pt;">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" target="_blank">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" target="_blank">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" target="_blank">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" target="_blank">openstreetmap.org</a>? <br>
<br>
Thanks,<br>
<br>
-Adam</p>
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<p class="MsoNormal"> </p>
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</blockquote></div><br>