[mapserver-dev] WorldMapping issue

[Stephen Woodbridge]

Tiling support in mapserver:

1) while is doesn't have it directly yet, Assefa as a patch the will 
hopefully be included in MS 6.0 that adds WMS-C tile support to 
mapserver with metatiling and edge buffering as Roger mentioned below.

2) tiling with mapserver has been available since it was implemented in 
  php/mapscript and I ported that to perl/mapscript 4+- years ago as 
part of ka-map. I have also written 2-3 tile generation programs in C 
using mapserver as a library. In all of these we have metatile and edge 
buffering support and labels look great.

-Steve W

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