Thanks a lot for the feedback guys. Simply using interpolation to do the smoothing makes a lot of sense! Thanks Simone. I am going to experiment a bit more and I’ll come back with my findings.
On Fri, Apr 8, 2016 at 7:09 AM Simone Giannecchini < simone.giannecch...@geo-solutions.it> wrote: > Ciao Justin, > adding to Andrea's, please, read below... > > Regards, > Simone Giannecchini > == > GeoServer Professional Services from the experts! > Visit http://goo.gl/it488V for more information. > == > Ing. Simone Giannecchini > @simogeo > Founder/Director > > GeoSolutions S.A.S. > Via di Montramito 3/A > 55054 Massarosa (LU) > Italy > phone: +39 0584 962313 > fax: +39 0584 1660272 > mob: +39 333 8128928 > > http://www.geo-solutions.it > http://twitter.com/geosolutions_it > > ------------------------------------------------------- > AVVERTENZE AI SENSI DEL D.Lgs. 196/2003 > Le informazioni contenute in questo messaggio di posta elettronica e/o > nel/i file/s allegato/i sono da considerarsi strettamente riservate. > Il loro utilizzo è consentito esclusivamente al destinatario del > messaggio, per le finalità indicate nel messaggio stesso. Qualora > riceviate questo messaggio senza esserne il destinatario, Vi preghiamo > cortesemente di darcene notizia via e-mail e di procedere alla > distruzione del messaggio stesso, cancellandolo dal Vostro sistema. > Conservare il messaggio stesso, divulgarlo anche in parte, > distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità > diverse, costituisce comportamento contrario ai principi dettati dal > D.Lgs. 196/2003. > > The information in this message and/or attachments, is intended solely > for the attention and use of the named addressee(s) and may be > confidential or proprietary in nature or covered by the provisions of > privacy act (Legislative Decree June, 30 2003, no.196 - Italy's New > Data Protection Code).Any use not in accord with its purpose, any > disclosure, reproduction, copying, distribution, or either > dissemination, either whole or partial, is strictly forbidden except > previous formal approval of the named addressee(s). If you are not the > intended recipient, please contact immediately the sender by > telephone, fax or e-mail and delete the information in this message > that has been received in error. The sender does not give any warranty > or accept liability as the content, accuracy or completeness of sent > messages and accepts no responsibility for changes made after they > were sent or for other risks which arise as a result of e-mail > transmission, viruses, etc. > > > On Thu, Apr 7, 2016 at 7:56 PM, Andrea Aime > <andrea.a...@geo-solutions.it> wrote: > > On Wed, Apr 6, 2016 at 10:02 PM, Justin Deoliveira <jdeol...@gmail.com> > > wrote: > >> > >> Hi folks, > >> > >> I’m working on a project to expose Solr’s heatmap capability through > >> GeoServer. You can find details about Solr heatmaps here: > >> > >> https://cwiki.apache.org/confluence/display/solr/Spatial+Search > >> (search for “Heatmap Faceting”. > >> > >> But the gist of it is this: If you have a spatial field that uses the > >> recursive prefix tree type (ie. geohash) for indexing then it’s easy > using > >> Solr’s facetting infrastructure to generate a heatmap grid. What you get > >> back from Solr is a 2D array representing the geohash grid, where each > value > >> is a count of documents that intersect that grid cell. Applying some > >> symbolization you can get something that looks like this: > >> > >> > >> > https://raw.githubusercontent.com/voyagersearch/leaflet-solr-heatmap/master/sample.png > >> > >> The above screen shot comes from a leaflet plugin that visualizes the > >> heatmap directly in the browser. I would like to add a similar looking > >> visualization for GeoTools/GeoServer. > >> > >> My first thought was to expose this as a new type of coverage reader, > >> since the data is simple grid it falls into the model quite easily. The > >> major benefit of this approach is that becomes trivial to configure in > >> GeoServer and easy to style using all of the existing raster symbology > >> support. I’m interested to hear if others think this is a good approach. > > > > > > I believe it is. You might want have a look at how the sde coverage > reader > > was setup, to share the same connection > > info as a vector solr store (downside, you first have to setup a vector > > store). > > > >> > >> > >> If that sounds good my plan was to add this to the existing solr module. > >> It won’t add any new dependencies aside from a dependency on the > coverage > >> module. > >> > >> @Andrea: you’re listed as the module maintainer… although if I recall > >> correctly we agreed to co-maintain the module? > > > > > > We did, just add yourself in the pom :-) > > > >> > >> > >> I have a prototype working so if that all sounds good I’ll push up a > >> branch for folks to look at. > > > > > > Great > > > >> > >> One thing I am particular eager to get some feed back on is how to best > >> achieve the blur affect that makes heatmaps look “ > >> pretty”. At the moment what I have done is baked in a parameter to the > >> coverage format that specifies a blur radius and then when reading the > >> coverage I run it through the Convolve operation to achieve the desired > >> affect. It would be ideal if this could be done at symbolization time. > I’m > >> wondering if we currently have any way to define a blur or some similar > >> effect at rendering time with sld? Would a rendering transform work? > > > > > > I don't think we have a blur operation, a rendering transform would > likely > > do the trick with the smallest effort. > > In an ideal world, it would be nice to have a FTS level vendor parameter > to > > perform blurring just like we do color composition > > but I guess that might be more complex to implement. > > Thinking... > I had a quick look at the output of the SOLR heatmap and (as I > expected) what we get from it are numbers. > > To make this look pretty you might want to perform smooting even by > simply doing a bilinear or bicubic interpolation, you do not really > need anything as fancy as a kernel operation. > For this we could use the existing scale rendering transformation that > also supports interpolation as a parameter; it should work by doing an > identity transform with higher order interpolation (biliner or > bicubic). > > Next step would be to apply a color map on top. > > > > > Cheers > > Andrea > > > > -- > > == > > GeoServer Professional Services from the experts! Visit > > http://goo.gl/it488V for more information. > > == > > > > Ing. Andrea Aime > > @geowolf > > Technical Lead > > > > GeoSolutions S.A.S. > > Via di Montramito 3/A > > 55054 Massarosa (LU) > > phone: +39 0584 962313 > > fax: +39 0584 1660272 > > mob: +39 339 8844549 > > > > http://www.geo-solutions.it > > http://twitter.com/geosolutions_it > > > > AVVERTENZE AI SENSI DEL D.Lgs. 196/2003 > > > > Le informazioni contenute in questo messaggio di posta elettronica e/o > nel/i > > file/s allegato/i sono da considerarsi strettamente riservate. Il loro > > utilizzo è consentito esclusivamente al destinatario del messaggio, per > le > > finalità indicate nel messaggio stesso. Qualora riceviate questo > messaggio > > senza esserne il destinatario, Vi preghiamo cortesemente di darcene > notizia > > via e-mail e di procedere alla distruzione del messaggio stesso, > > cancellandolo dal Vostro sistema. Conservare il messaggio stesso, > divulgarlo > > anche in parte, distribuirlo ad altri soggetti, copiarlo, od utilizzarlo > per > > finalità diverse, costituisce comportamento contrario ai principi dettati > > dal D.Lgs. 196/2003. > > > > > > > > The information in this message and/or attachments, is intended solely > for > > the attention and use of the named addressee(s) and may be confidential > or > > proprietary in nature or covered by the provisions of privacy act > > (Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection > > Code).Any use not in accord with its purpose, any disclosure, > reproduction, > > copying, distribution, or either dissemination, either whole or partial, > is > > strictly forbidden except previous formal approval of the named > > addressee(s). If you are not the intended recipient, please contact > > immediately the sender by telephone, fax or e-mail and delete the > > information in this message that has been received in error. The sender > does > > not give any warranty or accept liability as the content, accuracy or > > completeness of sent messages and accepts no responsibility for changes > > made after they were sent or for other risks which arise as a result of > > e-mail transmission, viruses, etc. > > > > > > ------------------------------------------------------- > > > > > ------------------------------------------------------------------------------ > > > > _______________________________________________ > > GeoTools-Devel mailing list > > GeoTools-Devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/geotools-devel > > >
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