re: But maybe I'm missing something as I never used the "tile"<br>
support in MS (does it exist ? does it handle labels nicely?)<br>
<br>Yes, it does exist, <a href="http://mapserver.org/output/tile_mode.html">http://mapserver.org/output/tile_mode.html</a>, and with the upcoming addition of support for metatiling and edge buffering, <a href="http://trac.osgeo.org/mapserver/ticket/3323">http://trac.osgeo.org/mapserver/ticket/3323</a>, it appears that labels look quite good.<br>
<br>Roger<br>--<br><br><div class="gmail_quote">On Mon, Feb 22, 2010 at 7:44 AM, strk <span dir="ltr"><<a href="mailto:strk@keybit.net">strk@keybit.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
On Mon, Feb 22, 2010 at 08:33:30AM -0500, Frank Warmerdam wrote:<br>
<br>
> I *suspect* the best way to handle it well would be for MapServer<br>
> to understand something special about the dateline, at least about<br>
> geographic coordinate systems, and to split dateline crossing<br>
> requests into two or more requests.<br>
><br>
> So the -360 to +360 case should be broken into 3 requests:<br>
><br>
> -360 to -180 which would be internally rendered as 0 to 180.<br>
> -180 to +180 which would be rendered as -180 to +180<br>
> +180 to +360 which would be rendered as -180 to 0.<br>
><br>
> Then the three results should be mosaiced back together.<br>
> Unfortunately this would require a fair amount of development<br>
> work.<br>
<br>
This would pretty much mimic what you can get with OL,<br>
so would present the same limits (handling of labels).<br>
<br>
But maybe I'm missing something as I never used the "tile"<br>
support in MS (does it exist ? does it handle labels nicely?)<br>
<br>
> I do not thing it would be practical to recognize limits to<br>
> projected coordinate systems and to use such a technique<br>
> though similar wrapping issues can apply in projected<br>
> coordinate systems as well. For instance this is<br>
> fairly straight forward in mercator, but complicated in<br>
> many projections like the perspective view ones.<br>
<br>
I guess the "dateline" concept would be good enough.<br>
<br>
--strk;<br>
<br>
() Free GIS & Flash consultant/developer<br>
/\ <a href="http://foo.keybit.net/%7Estrk/services.html" target="_blank">http://foo.keybit.net/~strk/services.html</a><br>
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