Menu
▾
▴
Re: [Geotools-devel] Querying point values from a grid coverage reader
|
From: Andrea A. <and...@ge...> - 2011-07-28 13:13:33
|
On Thu, Jul 28, 2011 at 2:38 PM, Michael Bedward <mic...@gm...> wrote: > Dear all, especially Simone, Andrea and Daniele, > > I'm want to get the JMapPane InfoTool thing working properly with > GridReaderLayers. I'd be grateful for any advice on how to query > values at point locations from the underlying grid coverage reader in > the most efficient manner, by which I guess I mean best trade-off of > memory use and performance. See http://svn.codehaus.org/geoserver/trunk/src/wms/src/main/java/org/geoserver/wms/GetFeatureInfo.java in particular the identifyRasterLayer method. In short: - to perform a identify on the raster you have to load the coverage - some coverage stores do not have inner tiling and/or cannot lazy load them - you don't want to load a massive amount of raster data in memory -> the solution is to load a coverage which is a very small subset of the raster, in the area where you need it Hope this helps Cheers Andrea -- ------------------------------------------------------- Ing. Andrea Aime GeoSolutions S.A.S. Tech lead Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 962313 http://www.geo-solutions.it http://geo-solutions.blogspot.com/ http://www.youtube.com/user/GeoSolutionsIT http://www.linkedin.com/in/andreaaime http://twitter.com/geowolf ------------------------------------------------------- |