On 12 January 2017 at 04:59, Alexandre Neto <[email protected]> wrote: > I will share my opinion as I did in the developers list. > > We users are as responsible for QGIS development as the developers. So > rather than asking what QGIS can do for us, maybe we should think what we > can do for QGIS. Don't just wait that a volunteer developer decide to spend > his free time developing a tool that you need. > > IMHO, since it seems that you are not able/willing to sponsor the feature > yourself, sounds like a good opportunity for a small crowdfunding. > > That way you would be able to contribute back to QGIS by giving your time in > finding a developer able to do it, setting up the crowdfunding, advertise > it, pay for part of it and so on. > > It looks like a simple feature. It should not be very expensive (much less > than an ArcGIS license for sure), and if you think many people need this, > then the money will be easy to raise. And there is still time to introduce > this before QGIS 3.0.
Just to add to this - you may find the writeup at http://nyalldawson.net/2016/08/how-to-effectively-get-things-changed-in-qgis/ useful as a summary of the different approaches you can take to get this feature implemented. What you've done so far is a perfect first step - determining that there's high demand and lots of interest in your feature! Nyall > > Best regards, > Alexandre Neto > > > A qua, 11/01/2017, 14:55, Stéphane Henriod <[email protected]> escreveu: >> >> Thanks for checking, that's what I realized as well! >> >> Do you know if there is still a chance to include it for 3.0 or is it too >> late already? >> >> Cheers >> >> Stéphane >> >> >> Le mercredi 11 janvier 2017, DelazJ <[email protected]> a écrit : >>> >>> Hi Stéphane, >>> >>> I gave it a look and I'm sorry I was wrong. There have been some work on >>> the raster classification but it was rather about color and extent >>> management. See >>> https://github.com/qgis/QGIS/pulls?utf8=%E2%9C%93&q=is%3Apr%20discrete%20is%3Aclosed%20 >>> or >>> https://github.com/qgis/QGIS/pulls?utf8=%E2%9C%93&q=is%3Apr%20pseudocolor%20is%3Aclosed%20 >>> but testing upcoming 3.0 shows that nothing has changed in the area you are >>> interested in. >>> >>> Harrissou >>> >>> 2017-01-11 4:37 GMT+01:00 Stéphane Henriod <[email protected]>: >>>> >>>> Hi Harrissou >>>> >>>> is there any description / documentation of the work that has been done >>>> on this (feature description, etc.)? If yes, I'd like to have a look and >>>> maybe >>>> >>>> Thanks a lot! >>>> >>>> Stéphane >>>> >>>> >>>> Le mardi 10 janvier 2017, DelazJ <[email protected]> a écrit : >>>>> >>>>> Hi Stéphane, >>>>> >>>>> 2017-01-10 4:02 GMT+01:00 Stéphane Henriod <[email protected]>: >>>>>> >>>>>> Hi Chris >>>>>> this is very nice! I indeed didn't know this trick and will certainly >>>>>> use it again in the future! >>>>>> >>>>>> However... :-) >>>>>> >>>>>> I am currently teaching QGIS to beginners and this for sure is not an >>>>>> appropriate method for them (especially in the case you have to generate >>>>>> the >>>>>> symbology file through a script)! >>>>>> >>>>>> Since the user can style continuous rasters with some >>>>>> "button-clicking", I believe the same option should be available for >>>>>> discrete rasters as well. >>>>>> >>>>>> I am thus wondering if anyone else than me sees it as a priority for >>>>>> QGIS? If yes, how to motivate the developers to take it for the next >>>>>> release >>>>>> and / or how much would such a development cost? (I unfortunately don't >>>>>> have >>>>>> the competences to do it myself) >>>>>> >>>>> There have been some work done in the raster properties dialog in the >>>>> upcoming 3.0. I don't know if your concern was covered though. >>>>> If you want, you can move the question to the developer's list and >>>>> discuss whether/how this can be implemented (and its requirements). >>>>> >>>>> Regards, >>>>> Harrissou >>>>> >>>>>> Thanks again and cheers! >>>>>> >>>>>> Stéphane >>>>>> >>>>>> >>>>>> Le mardi 10 janvier 2017, Chris House <[email protected]> a écrit : >>>>>>> >>>>>>> Hi Stéphane, >>>>>>> >>>>>>> I don't know if this is what you are looking for or not but I have a >>>>>>> method of classifying rasters by color based on a set (standard) >>>>>>> colors. I >>>>>>> created a spreadsheet that has several required columns, value, red, >>>>>>> green, >>>>>>> blue...and you can have an optional field for a display value. So say >>>>>>> value >>>>>>> 1 is water you can use that last column to name that value so that in >>>>>>> the >>>>>>> QGIS layer tree and in legend it says Water instead of value 1. >>>>>>> >>>>>>> save the spreadsheet as a csv and change the extension to .txt >>>>>>> instead of .csv. >>>>>>> >>>>>>> I then go into the symbology section of the raster choose singleband >>>>>>> pseudocolor. Use the folder to browse to your text file and click add. >>>>>>> There is a format for this text file. It is below. If you need me to >>>>>>> email >>>>>>> it I will do that in direct email. >>>>>>> >>>>>>> # QGIS Generated Color Map Export File >>>>>>> INTERPOLATION:EXACT >>>>>>> -9999,0,0,0,255,NoData >>>>>>> 0,176,176,176,255,Non-Forested >>>>>>> 15,234,255,191,255,10 <= CC < 20 >>>>>>> 25,187,230,149,255,20 <= CC < 30 >>>>>>> 35,140,201,109,255,30 <= CC < 40 >>>>>>> 45,98,176,74,255,40 <= CC < 50 >>>>>>> 55,59,153,43,255,50 <= CC < 60 >>>>>>> 65,0,128,0,255,60 <= CC < 70 >>>>>>> 75,15,92,11,255,70 <= CC < 80 >>>>>>> 85,17,61,12,255,80 <= CC < 90 >>>>>>> 95,16,36,12,255,90 <= CC <= 100 >>>>>>> >>>>>>> In my example if I don't assign a value it gets ignored by QGIS. If >>>>>>> you are wondering how to assign unique colors to say 200 unique >>>>>>> values...just script it. I have done this and as long as you have the >>>>>>> number of unique values you want and to make them unique in the script >>>>>>> it >>>>>>> works. >>>>>>> >>>>>>> I hope this helps. I know it isn't a "button" but to be honest I >>>>>>> like this better. If you already knew this...well then maybe it will >>>>>>> help >>>>>>> someone out in the future. >>>>>>> >>>>>>> --Chris >>>>>>> >>>>>>> On Mon, Jan 9, 2017 at 3:00 PM, <[email protected]> >>>>>>> wrote: >>>>>>>> >>>>>>>> Send Qgis-user mailing list submissions to >>>>>>>> [email protected] >>>>>>>> >>>>>>>> To subscribe or unsubscribe via the World Wide Web, visit >>>>>>>> http://lists.osgeo.org/mailman/listinfo/qgis-user >>>>>>>> or, via email, send a message with subject or body 'help' to >>>>>>>> [email protected] >>>>>>>> >>>>>>>> You can reach the person managing the list at >>>>>>>> [email protected] >>>>>>>> >>>>>>>> When replying, please edit your Subject line so it is more specific >>>>>>>> than "Re: Contents of Qgis-user digest..." >>>>>>>> >>>>>>>> >>>>>>>> Today's Topics: >>>>>>>> >>>>>>>> 1. Re: Symbolizing a discrete or a boolean raster (Stéphane >>>>>>>> Henriod) >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> ---------------------------------------------------------------------- >>>>>>>> >>>>>>>> Message: 1 >>>>>>>> Date: Mon, 9 Jan 2017 23:07:36 +0600 >>>>>>>> From: Stéphane Henriod <[email protected]> >>>>>>>> To: Enrico Fiore <[email protected]> >>>>>>>> Cc: qgis-user <[email protected]> >>>>>>>> Subject: Re: [Qgis-user] Symbolizing a discrete or a boolean raster >>>>>>>> Message-ID: >>>>>>>> >>>>>>>> <cak6pvbxurm_e7drp+8sp9ampuux0+cn3gvxlpnjohhno85o...@mail.gmail.com> >>>>>>>> Content-Type: text/plain; charset="utf-8" >>>>>>>> >>>>>>>> Hi >>>>>>>> >>>>>>>> thanks for following up! >>>>>>>> >>>>>>>> It actually does part of the job! >>>>>>>> >>>>>>>> Using *Color interpretation: Exact*, I can indeed input the exact >>>>>>>> values I >>>>>>>> want to display (1,5 and 10) and all other pixels are hidden. >>>>>>>> >>>>>>>> HOWEVER, >>>>>>>> >>>>>>>> this still feels like a workaround: >>>>>>>> >>>>>>>> - In the case of a discrete raster with many (> 50) unique >>>>>>>> values, I do >>>>>>>> not want to input all of them manually >>>>>>>> - In some cases, I do not know in advance all the unique values >>>>>>>> of my >>>>>>>> raster >>>>>>>> - If I click on *Classify*, QGIS will choose X values (based on >>>>>>>> the >>>>>>>> number of classes and the classification method (continuous or >>>>>>>> equal >>>>>>>> interval)), which no longer match the "exact" values of my >>>>>>>> raster. It >>>>>>>> doesn't really make sense to classify a discrete rendering >>>>>>>> >>>>>>>> So I would say, we still need a render type "discrete raster" which >>>>>>>> offers >>>>>>>> the function to "retrieve all unique values" (and automatically >>>>>>>> apply a >>>>>>>> discrete color ramp) >>>>>>>> >>>>>>>> Attached a (fake) test dataset. >>>>>>>> >>>>>>>> Thanks and cheers >>>>>>>> >>>>>>>> Stéphane >>>>>>>> >>>>>>>> >>>>>>>> Le lundi 9 janvier 2017, Enrico Fiore <[email protected]> a >>>>>>>> écrit : >>>>>>>> >>>>>>>> > Hi, >>>>>>>> > Sorry I can't do test, but if you use exact in color interpolation >>>>>>>> > parameter? >>>>>>>> > >>>>>>>> > Cheers >>>>>>>> > >>>>>>>> > Enrico >>>>>>>> >>>>>>>> >>>>>>>> Le lundi 9 janvier 2017, Stéphane Henriod <[email protected]> a écrit : >>>>>>>> >>>>>>>> > 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] >>>>>>>> > <javascript:_e(%7B%7D,'cvml','[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_r >>>>>>>> >> aster/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]> >>>>>>>> >> Data: 09/01/2017 6.30 >>>>>>>> >> A: "qgis-user"<[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-d >>>>>>>> >> iscrete-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] >>>>>>>> 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> >>>>>>>> -------------- next part -------------- >>>>>>>> An HTML attachment was scrubbed... >>>>>>>> URL: >>>>>>>> <http://lists.osgeo.org/pipermail/qgis-user/attachments/20170109/985fd14c/attachment-0001.html> >>>>>>>> -------------- next part -------------- >>>>>>>> A non-text attachment was scrubbed... >>>>>>>> Name: landcover.zip >>>>>>>> Type: application/zip >>>>>>>> Size: 2151 bytes >>>>>>>> Desc: not available >>>>>>>> URL: >>>>>>>> <http://lists.osgeo.org/pipermail/qgis-user/attachments/20170109/985fd14c/attachment-0001.zip> >>>>>>>> >>>>>>>> ------------------------------ >>>>>>>> >>>>>>>> Subject: Digest Footer >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> Qgis-user mailing list >>>>>>>> [email protected] >>>>>>>> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user >>>>>>>> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user >>>>>>>> >>>>>>>> ------------------------------ >>>>>>>> >>>>>>>> End of Qgis-user Digest, Vol 131, Issue 13 >>>>>>>> ****************************************** >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> 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 // запас.союз.дружный >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Qgis-user mailing list >>>>>> [email protected] >>>>>> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user >>>>>> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user >>>>> >>>>> >>>> >>>> >>>> -- >>>> 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 // 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 // запас.союз.дружный >> >> _______________________________________________ >> Qgis-user mailing list >> [email protected] >> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user > > -- > Alexandre Neto > --------------------- > @AlexNetoGeo > http://sigsemgrilhetas.wordpress.com > http://gisunchained.wordpress.com > > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: http://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-user mailing list [email protected] List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
