[OpenLayers-Dev] Background Layer in EPSG:900913 causes WMS overlays to fail

[Felipe Alcacibar]

when i was starting with google maps, was a annoying issue with the
EPSG:900913 srs. but searching i found the EPSG:3857 srs and is the
same of 900913 (you should comprobe in your proj4 epsg file if you aer
unsure) is the best and transparent solution and all gis that supports
epsg srs have it.

hope this helps, have a nice day.


Felipe Alcacibar Buccioni

On 17 March 2011 06:18, Ulrik Balslev <ubalslev at gmail.com> wrote:
> Hi List,
>
> I have a problem with an overlay WMS layer not being shown when zooming in
> on the map.
>
> The problem seem to only occur when using a background WMS Layer in
> EPSG:900913.
>
> I have created a demonstration page available here:
>
> andarki.dk/Stackoverflow/OpenLayers/WMS.html
>
> Both maps are identical, except for the background map.
>
> The left map is using a Background map in EPSG:4326, while the 2nd
> background map is using EPSG:900913.
>
> If you zoom in, you will notice that the Nexrad layer only stays visible at
> the left map.
>
> There is also a 3rd map, which explicitly sets the map object to use
> EPSG:900913, but otherwise is similar to the 2nd map.
>
> If you look at the two requests being sent to the Nexrad server for the
> second map, the BBOX is wrong:
>
> Request1: BBOX=-5009557.0848,-90.000000001863,-179.99999999814,5009287.0848
>
> Request2: BBOX=-179.99999999814,-90.000000001863,5009197.0848,5009287.0848
>
> These coordinates (in EPSG:900913) corresponds to Africa, not North America
> as expected.
>
> Thanks for any input
>
> Best regards
>
>
> Ulrik Balslev,
> breakoutimage, Denmark
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