On 11/22/2013 02:38 PM, Chris Jackson wrote: > Hi all > > I got the old Corine geotiff raster sample working with the usual select by > click tool, but it doesn't work using select by rectangle (doesn't appear > on the list of layers to choose). > > Is this by design or me just missing some configuration? Can it be done? >
by design. You'd definitively not want a select on raster data, and it wouldn't make much sense either. See http://mapserver.org/input/raster.html#raster-query and especially the sentence "Raster queries on raster layers return one point feature for each pixel matching the query". So a single feature is a pixel, not the pixels belonging to a class and separated from other classes. If your selections are e.g. 5000 pixels you would get 5000 records back to display, all with the same values... and you'd need to create 5000 points for the highlighting layer. Also, one would expect the full area of a homogeneous class block to be treated as a single feature (like a single polygon) and selected altogether, which is not feasible since every pixel is an independent. Think about a global vegetation raster layer, just 10000 by 5000 pixels which is not really much (e.g. a Tiff with 150 MB). If a user selects the whole world you'd select roughly 0.3 * 10000 * 5000 pixels and their values to be read pixel by pixel... ------------------------------------------------------------------------------ Shape the Mobile Experience: Free Subscription Software experts and developers: Be at the forefront of tech innovation. Intel(R) Software Adrenaline delivers strategic insight and game-changing conversations that shape the rapidly evolving mobile landscape. Sign up now. http://pubads.g.doubleclick.net/gampad/clk?id=63431311&iu=/4140/ostg.clktrk _______________________________________________ pmapper-users mailing list pmapper-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pmapper-users
