Looks ok as far as it goes, but the other parameters are important as well.
41K points is probably pushing the bounds of BarnesSurface a bit too much.
it's really designed to interpolate relatively few scattered observations.
If you have a regular grid of observations there's probably better and
faster algorithms to use (although I'm not sure what would be the best
choice.
On Tue, Jan 8, 2013 at 7:18 AM, Chris Haste <cha...@airdata.co.uk> wrote:
> Well my initial attempts at this are resulting in nothing being displayed,
> so I’d like to check whether I have some of the basics correct.****
>
> ** **
>
> I have an SQL View Layer called TemperatureMap. The SQL in this view
> returns a table of two columns: location of type Point and temperature of
> type Float.****
>
> ** **
>
> I have set the appropriate (I think) parts of the SLD as follows:****
>
> <NamedLayer>
> <Name>TemperatureMap</Name>
> <UserStyle>****
>
> …****
>
> <ogc:Function name="gs:BarnesSurface">
>
> <ogc:Function name="parameter">
> <ogc:Literal>data</ogc:Literal>
> </ogc:Function>****
>
> . . . ****
>
> <ogc:Function name="parameter">
> <ogc:Literal>valueAttr</ogc:Literal>
>
> <ogc:Literal>temperature</ogc:Literal>
> </ogc:Function>****
>
> ** **
>
> Is this correct?****
>
> ** **
>
> *From:* Chris Haste [mailto:cha...@airdata.co.uk]
> *Sent:* 08 January 2013 14:20
> *To:* Andrea Aime
>
> *Cc:* geoserver-users@lists.sourceforge.net
> *Subject:* Re: [Geoserver-users] gs:Heatmap problems****
>
> ** **
>
> Ah!****
>
> ** **
>
> Thanks Andrea, I will go and try that one!****
>
> ** **
>
> *From:* andrea.a...@gmail.com [mailto:andrea.a...@gmail.com] *On Behalf
> Of *Andrea Aime
> *Sent:* 08 January 2013 14:18
> *To:* Chris Haste
> *Cc:* geoserver-users@lists.sourceforge.net
> *Subject:* Re: [Geoserver-users] gs:Heatmap problems****
>
> ** **
>
> 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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>
> @geowolf****
>
> Technical Lead****
>
> ** **
>
> GeoSolutions S.A.S.****
>
> Via Poggio alle Viti 1187****
>
> 55054 Massarosa (LU)****
>
> Italy****
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> phone: +39 0584 962313****
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