A further comment on this - if you precompute the heatmap, then the
resolution will be fixed, so zooming in may result in low-quality display.
This is one reason the heatmap RT was originally developed - to provide
full resolution display at all scales.
On Tue, Jul 24, 2012 at 12:28 PM, Martin Davis <[email protected]> wrote:
> 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.
>
>
--
Martin Davis
OpenGeo - http://opengeo.org
Expert service straight from the developers.
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