+1 for everything Andrea said about Heatmaps - they are density maps, not
interpolation surfaces.
Also, the output values are in the range [0,1], which is another reason you
saw only one color in your output.
On Tue, Jan 8, 2013 at 6:17 AM, Andrea Aime <andrea.a...@geo-solutions.it>wrote:
> On Tue, Jan 8, 2013 at 3:14 PM, Chris Haste <cha...@airdata.co.uk> wrote:
>
>> Hi Andrea,****
>>
>> ** **
>>
>> I’m not sure I understand. Are you saying that I don’t have a sufficient
>> number of points in my data? I have a regular grid of points covering the
>> entire globe at 1.25 x 1.25 degree intervals. Is this not dense enough?
>>
>
> I'm saying a heatmap shows a color based on the different concentration of
> points, not their value, so if the grid is regular it's normal that
> you get a solid color.
>
> If you want to interpolate a value contained in the attributes of the
> points instead you have to use the Barnes surface instead.
> See some docs here:
> http://suite.opengeo.org/docs/cartography/rt/barnes.html
>
> Cheers
> Andrea
>
>
>> ****
>>
>> ** **
>>
>> *From:* andrea.a...@gmail.com [mailto:andrea.a...@gmail.com] *On Behalf
>> Of *Andrea Aime
>> *Sent:* 08 January 2013 14:09
>> *To:* Chris Haste
>> *Cc:* geoserver-users@lists.sourceforge.net
>> *Subject:* Re: [Geoserver-users] gs:Heatmap problems****
>>
>> ** **
>>
>> On Tue, Jan 8, 2013 at 3:03 PM, Chris Haste <cha...@airdata.co.uk> wrote:
>> ****
>>
>> Hi List,****
>>
>> ****
>>
>> I have been trying to use the new heatmap transformation in version 2.2.3
>> but I think I must be doing something wrong.****
>>
>> I wish to display a layer defined using an SQL view. The query simply
>> returns a Grid of points and for each point there is a temperature value, I
>> am using the round function in the query to round the temperature value to
>> the nearest integer.****
>>
>> ****
>>
>> I am using the SLD below, copied from the example and modified to
>> (hopefully) work with my data. However, the entire map is produced in one
>> colour (#FFFF00) but when I query the map by clicking on it in an
>> Openlayers preview it shows correct values for the Temperatures and
>> different locations on the map yield different values.****
>>
>> ****
>>
>> Any ideas?****
>>
>> ** **
>>
>> Heatmaps are about point density, if you want to interpolation function
>> you should look at the Barnes surface transformation****
>>
>> instead****
>>
>> ** **
>>
>> Cheers****
>>
>> Andrea****
>>
>> ****
>>
>> ** **
>>
>> -- ****
>>
>> ==****
>>
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>>
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>>
>> @geowolf****
>>
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>>
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>>
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>>
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>>
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>>
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>
>
> --
> ==
> Our support, Your Success! Visit http://opensdi.geo-solutions.it for more
> information.
> ==
>
> Ing. Andrea Aime
> @geowolf
> Technical Lead
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
> phone: +39 0584 962313
> fax: +39 0584 1660272
> mob: +39 339 8844549
>
> http://www.geo-solutions.it
> http://twitter.com/geosolutions_it
>
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