Cheers Armin will give that a go, out of interest could an attribute search query (find all pixels between values x and y) be wired to a raster layer?
Chris On 25 November 2013 20:26, Armin Burger <armin.bur...@gmx.net> wrote: > if you want to give it a try with raster layers and selection, change in > incphp/xajax/x_select.php, line 94 > from > if ($mapLayer->type < 3 && ... > to > if ($mapLayer->type < 4 && ... > > You should turn off highlighting in the XML config file to avoid errors. > > armin > > On 11/25/2013 08:58 PM, Chris Jackson wrote: > > Hi Armin > > > > Been off-grid for a bit, thanks for clarifying. I appreciate it is > > selection of pixels, this may be still useful in some situations for > > smaller local areas. I am dealing with model outputs (to date mainly > > rectilinear->polygon features), though may now be dealing with > rasterised > > flexi-mesh grids instead and trying to maintain the level of data > > accessibility where possible. I wonder whether I need to grab selection > > extents and query a separate points feature class instead. > > > > Cheers > > Chris > > > > > > On 22 November 2013 18:17, Armin Burger <armin.bur...@gmail.com> wrote: > > > >> 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. 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