[OpenLayers-Users] Image layer on top of OSM

[Egil Möller]

Ah, thank you. A comment about this in the documentation would have been
useful.

Whast about WebGL, couldn't that solve this? Just a thought...

The data I'm working with is photographic (aerial photography), so I'll
have to do server side reprojection...

I assume the same issue is present if you try to add multiple tile based
layers (e.g. OSM and WMS) with allOverlays = true, that is, they all
have to be in the same projection?

Best regards,
Egil



On 08/21/2013 12:05 AM, Phil Scadden wrote:
> you are correct - if you are going to overlay images, then they must
> be on the same projection. Re-projecting an image on the fly is costly
> (and degrades the image quality), and beyond what a browser running JS
> can do in reasonable time. Geoserver can do on-the-fly reprojection of
> image sources but that doesnt solve image quality issues (and is
> expensive on server cpu resources). You want to look hard at how the
> image was created in the first place. If it is photographic or
> similar, then offline reprojection to 900913 using high-quality
> (cpu-intensive) options is best path. If it originated from vector
> data, then go back to the original vector data and use a WMS server to
> deliver it in the desired projection on the fly.
>
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