[Qgis-developer] Symbolizing a discrete or a boolean raster

Thu Jan 12 03:17:45 PST 2017

Great, thanks!

A qui, 12/01/2017, 10:44, Stéphane Henriod <stephanebek at gmail.com> escreveu:

> Hi all
>
> upon advice from Andreas, I started a formal description of the
> requirements for such a feature:
>
>
> https://docs.google.com/document/d/1cDemM2m88_mbs65sYzfBbVdHI_ObOjf_i35ne3OKsRs/edit?usp=sharing
>
> Please, anyone interested, do check, comment, add, correct,... Once we
> have a "final" version, I will inquire a more precise financial estimation.
> Then let's see how we can move forward!
>
> Thanks and cheers
>
> Stéphane
>
>
> Le jeudi 12 janvier 2017, Stéphane Henriod <stephanebek at gmail.com> a
> écrit :
>
> Hi Alexandre
>
> (also posting on user-)
>
> I 100% agree with you and I would love to somehow give back to QGIS (I did
> already, but at a small scale).
>
> I mostly wanted to know if I am the only one to wish for this feature.
> Apparently not the case: many have expressed the same wish!
>
> Now funding: I would love to have a rough idea what "not very expensive"
> means. If there are any dev around who could have the interest / skills to
> implement this feature, can we somehow go concrete and work together on a
> feature description and tentative budget? The situation is obviously very
> different if we talk about 1.000 or 20.000€
>
> Cheers
>
> Stéphane
>
>
> Le jeudi 12 janvier 2017, Alexandre Neto <senhor.neto at gmail.com> a écrit :
>
> Hello Stéphane,
>
> 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.
>
> Alexandre Neto
>
> Stéphane Henriod <stephanebek at gmail.com> escreveu no dia quarta,
> 11/01/2017 às 11:37:
>
> One last message for today (sorry for spamming!)
>
> It seems that this feature would actually be wished by "many" people (see
> the ticket and the talks on user-). I just gave a try to 2.99-nightly and,
> as far as I can see, nothing has been done in this direction (yet?).
>
> I am wondering if there are massive challenges that I am overlooking or if
> this could be implemented quite easily. In any case, do you think this is a
> request that can be taken on to 3.0?
>
> Thanks a lot to all the devs here... I feel quite bad for asking for a new
> feature while not having the competences to contribute a tiny bit to its
> development but I really feel this is one of the few major missing features
> in QGIS right now (and will be happy to help on the feature requirements,
> the tests, etc.).
>
> All the best!
>
> Stéphane
>
>
> Le mercredi 11 janvier 2017, Stéphane Henriod <stephanebek at gmail.com> a
> écrit :
>
> Hi again
>
> it seems that the requirements are related (although not 100% similar) to
> this other open (and assigned) ticket: http://hub.qgis.org/issues/14449
>
> I really hope to see this very needed feature in a coming version of QGIS
> and happy to help wherever I can!
>
> Cheers
>
> Stéphane
>
>
> Le mardi 10 janvier 2017, Stéphane Henriod <stephanebek at gmail.com> a
> écrit :
>
> Hi
>
> let me move here a request that has been shortly discussed on the
> user-mailing list:
> http://lists.osgeo.org/pipermail/qgis-user/2017-January/038793.html
> http://lists.osgeo.org/pipermail/qgis-user/2017-January/038795.html
> http://lists.osgeo.org/pipermail/qgis-user/2017-January/038801.html
>
> and for which a ticket is open:
> http://hub.qgis.org/issues/14845
>
> I was said that some work has been done in this direction for 3.0 but I
> don't know if it completely covers the feature request
>
> ----------------------
>
> When styling a discrete or boolean raster, there seems to be no direct
> method, only a few workarounds. The feature I dream of would do the
> following:
>
>    - A new render type "Discrete raster"
>    - One button allows to fetch all unique values form the raster (with a
>    warning message if there are more than XXX unique values)
>    - A color ramp is applied by default
>    - I can multi-select values and apply them the same style and / or the
>    same label
>    - I can remove values. The pixels with those values will simply not be
>    displayed
>    - I can save my color map and load an existing color map
>
> So pretty much like the ArcGIS implementation:
> http://resources.arcgis.com/en/help/main/10.1/index.html#/representing_unique_categories_such_as_land_use/009t00000074000000/
>
> The current limitations I see (in 2.14):
>
>    - The discrete values must be entered manually, which is a pain for a
>    raster with many unique values (or if I don't know in advance what all
>    values are)
>    - 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
>    - Although it is currently possible to style discrete rasters, the
>    procedure is not really intuitive for beginners
>
> ----------------------
>
> Is this a feature that is envisioned for 3.0? Is there anything I can do
> to support it? (except coding it myself, since I don't have the skills for
> that...)
>
> Thanks a lot in advance
>
> Cheers
>
> Stéphane
>
>
>
> --
>
> “When you travel, remember that a foreign country is not designed to make
> you comfortable. It is designed to make its own people comfortable." --
> Clifton Fadiman
>
>
>
> --
>
> “When you travel, remember that a foreign country is not designed to make
> you comfortable. It is designed to make its own people comfortable." --
> Clifton Fadiman
>
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> --
> Alexandre Neto
> ---------------------
> @AlexNetoGeo
> http://sigsemgrilhetas.wordpress.com
> http://gisunchained.wordpress.com
>
>
>
> --
>
> “When you travel, remember that a foreign country is not designed to make
> you comfortable. It is designed to make its own people comfortable." --
> Clifton Fadiman
>
>
>
> --
>
> “When you travel, remember that a foreign country is not designed to make
> you comfortable. It is designed to make its own people comfortable." --
> Clifton Fadiman
>
> --
Alexandre Neto
---------------------
@AlexNetoGeo
http://sigsemgrilhetas.wordpress.com
http://gisunchained.wordpress.com
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