Oh well, thanks again for the info Armin, have a good one. Cheers Chris
On 25 November 2013 21:04, Armin Burger <armin.bur...@gmail.com> wrote: > 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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