Actually, no it isn't. There's two reasons for that:
1. The outputBBOX parameter is used to determine the extent for the
computed heatmap. This needs to match the requested image extent
(otherwise you would get a distorted output)
2. Even if you could use a different outputBBOX, the heatmap image is still
computed each time a map request is processed. So there would be no
performance advantage to doing this (in fact, there would be a performance
degradation).
It sounds like what you want to do is to pre-compute a heatmap raster for
the entire dataset and then view it as a layer. Because the heatmap RT is
a WPS process it should be possible to call it as a WPS and store the
result raster as a new layer in GeoServer. I've never tried doing this -
try it and report back! (Note: you will have to provide output image
extents that match the aspect ratio of the dataset BBOX. )
On Tue, Jul 24, 2012 at 12:26 AM, Mario Basa <[email protected]> wrote:
> Hello,
>
> Is it possible to set the outputBBOX parameter described here:
>
>
> http://docs.geoserver.org/stable/en/user/styling/sld-extensions/rendering-transform.html#heatmap-generation
>
> to the extent of the entire point layer instead of the wms_bbox sld
> parameter? This is because I don't want to change (re-calculated to the
> points of wms_bbox extent) the heatmap whenever there is a panning or zoom
> event.
>
> If it is possible to set the extent, what will the syntax be (i.e. BBOX(x1
> y1,x2 y2)) ?
>
> Thanks and regards,
>
> Mario.
>
>
>
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--
Martin Davis
OpenGeo - http://opengeo.org
Expert service straight from the developers.
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