To try and confirm if things are working you might try something like:
Scale = 3
Convergence = default
minObservations = default
maxObservationDistance = 0 (default) - at least initially to try and get
something to show up. This is in units of the source CRS
pixelsPerCell = 4 (bigger number means faster computation)
queryBuffer = 0 (default; for test purposes, probably want to increase this
in final design)
Also, for testing it's best to view the output in the input CRS. There
were some issues with reprojecting the output of RTs which were fixed
recently (not sure what GS version you are using).
If you can create a layer with a small subset of your data that would be
good too. Even better, post it and your SLD so that others can try and
reproduce the problem.
Finally, it's possible there is some bug that is preventing the result from
being computed correctly. Stepping through in the debugger is the only way
to check this.
On Tue, Jan 8, 2013 at 9:48 AM, Chris Haste <cha...@airdata.co.uk> wrote:
> Thanks for the input Martin.****
>
> ** **
>
> I can understand that 41K points may be an issue but even when I request a
> much smaller bounding box in order to significantly reduce the number of
> points being used I still don’t get anything displayed.****
>
> ** **
>
> The data is a regular grid of points with a 1.25 x 1.25 degree spacing.
> The CRS is EPSG:4326. Would you be able to suggest suitable values for the
> other parameters, namely:****
>
> Scale, convergence, minObservations, maxObservationDistance (not sure if
> this should be meters or degrees), pixelsPerCell and queryBuffer?****
>
> ** **
>
> *From:* Martin Davis [mailto:mda...@opengeo.org]
> *Sent:* 08 January 2013 17:28
> *To:* Chris Haste
> *Cc:* Andrea Aime; geoserver-users@lists.sourceforge.net
>
> *Subject:* Re: [Geoserver-users] gs:Heatmap problems****
>
> ** **
>
> 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****
>
> ****
>
> ****
>
> -- ****
>
> ==****
>
> Our support, Your Success! Visit http://opensdi.geo-solutions.it for more
> information.****
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>
> ****
>
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>
> @geowolf****
>
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>
> ****
>
> GeoSolutions S.A.S.****
>
> Via Poggio alle Viti 1187****
>
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>
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>
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>
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>
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>
> ****
>
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>
> *** This communication has been sent from World Fuel Services ****
>
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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****
>
> ****
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> http://www.geo-solutions.it****
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> http://twitter.com/geosolutions_it****
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>
> ------------------------------------------------------------------------------
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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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