from the MS docs: "Other query operations such as QueryByIndex, QueryByIndexAdd, QueryByAttributes and QueryByFeature are not supported for raster layers"
On 11/25/2013 09:59 PM, Chris Jackson wrote: > 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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