Hi unfortunately this is doing quite something different!
If I have a raster with 10 Landcover classes (1,2,3,4,5,6,7,8,9,10) and I want to display only 1,5 and 10, using *Discrete *(1: red, 5: yellow, 10: blue) the following will happen: All pixels between 1 and 4 will be red All pixels between 5 and 9 will be yellow All pixels with 10 will be blue In this sense, the pixels are indeed not interpolated, but this still is not the behavior I am expecting when styling discrete rasters. A "style discrete raster" function should offer the following: - Automatically recover all unique values from the raster - Only display the pixels to which the user has explicitly assigned a color But thanks for your hint, this can be helpful in other cases! Cheers Stéphane Le lundi 9 janvier 2017, Enrico Fiore <[email protected]> a écrit : > Hi, > I think that the solution is in the QGIS documentation, that you can read > here: http://docs.qgis.org/2.14/en/docs/user_manual/working_with_ > raster/raster_properties.html#band-rendering > you have to use *Singleband pseudocolor *and set color interpolation to > Discrete. > > Enrico > > > ----Messaggio originale---- > Da: "Stéphane Henriod" <[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>> > Data: 09/01/2017 6.30 > A: "qgis-user"<[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>> > Ogg: [Qgis-user] Symbolizing a discrete or a boolean raster > > Dear all > > As much as I love QGIS and use it in my everyday life, there is one > feature that I find particularly annoying: the styling of discrete rasters. > > Basically, if I have a raster layer consisting of discrete landcover > values (1: water, 2: forest, 3: built-up), it seems that there is no easy > way to style it. QGIS will assume that the data is continuous and basically > interpolate the color between each value, which leads to the following > issues: > > Let's say I want to display only water and built-up (values 1 and 3), > water in blue and built-up in grey. QGIS will still display the forests, > using a color somewhere "between" blue and grey. My only left option is to > process the raster to actually replace all the 2 with NoData, which is > highly unpractical... > > Same if I have a boolean raster (only 0 and 1 values). QGIS will by > default make a color ramp from 0 to 0.9999. > > Also, the whole rather feels like a work-around for a missing feature. > > I dream of a feature similar to this one from ArcGIS: http://resources. > arcgis.com/en/help/main/10.1/index.html#/representing_ > unique_categories_such_as_land_use/009t00000074000000/ where all unique > values are styled independently and where I can easily skip the values I > don't want to see on my map. > > I asked a question here: > http://gis.stackexchange.com/questions/194116/qgis-style-a-discrete-raster > > and opened a ticket here: > http://hub.qgis.org/issues/14845 > > But none has gotten lots of attention yet... Am I the only one to be > annoyed by this? If no, please raise your hand and let's try to get some > momentum and see how to push this feature forward! > > Thanks a lot in advance! > > Cheers > > Stéphane > > > -- > Stéphane Henriod > CIM-Expert for GIS and Green Economy Statistics > > Национальный статистический комитет Кыргызской Республики > Кыргыз Республикасынын Улуттук статистика комитети > National Statistical Committee of the Kyrgyz Republic > > 374 Фрунзе ул. / Frunze str. > 720033 Бишкек / Bishkek > > T +996 778 46 99 02 (KG) > T +49 176 280 11 050 (DE) > E [email protected] <javascript:_e(%7B%7D,'cvml','[email protected]');> > W http://www.stat.kg > W3W: nightfall.into.bucket > <https://map.what3words.com/nightfall.into.bucket> // запас.союз.дружный > <https://map.what3words.com/запас.союз.дружный> > > > > -- Stéphane Henriod CIM-Expert for GIS and Green Economy Statistics Национальный статистический комитет Кыргызской Республики Кыргыз Республикасынын Улуттук статистика комитети National Statistical Committee of the Kyrgyz Republic 374 Фрунзе ул. / Frunze str. 720033 Бишкек / Bishkek T +996 778 46 99 02 (KG) T +49 176 280 11 050 (DE) E [email protected] W http://www.stat.kg W3W: nightfall.into.bucket <https://map.what3words.com/nightfall.into.bucket> // запас.союз.дружный <https://map.what3words.com/запас.союз.дружный>
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