Big interest on my side too (and I'm sure countless more). I always thought ESA's SNAP had a winning formula with their virtual raster bands, glad we can make any move in that direction.
Math On Tue, Apr 13, 2021, 20:57 Matthias Kuhn <[email protected]> wrote: > Hi Francesco, > > This is a great initiative, thank you for taking on this. > I have just recently had a project where this would have been of great > value. I'm very much looking forward to this work. > > Welcome on QGIS board and enjoy your GSoC. > > Matthias > > On Tue, Apr 13, 2021 at 3:41 PM Francesco Bursi < > [email protected]> wrote: > >> Hi Alister, >> >> Thank you for the feedback. >> Well, I imagine the new feature with some properties of the existing >> Raster Calculator but not exactly the same, e.g It won't be possible to set >> layer extent / output CRS, because this would be already pre-defined by the >> layer on which the renderer is applied, in the basic mockup you should not >> see these 2 field. The same can be said for choosing other layer. It should >> work like contours/hillshade renderer, where you can style only the layer >> you have currently selected but you can choose the band. >> Besides, I think that the existing Raster Calculator in the processing >> toolbox (as well as the Gdal Raster Calculator) allows the creation of a >> temporary file, enable the addition of a layer to the project that you can >> style, but maybe here I misunderstood what you meant. >> One of the advantage of the on-the-fly (styling) is to * avoid the need >> to create derived raster files and layers.* >> >> Let me know if I misunderstood something and thank you for the message. >> >> Kind Regards, >> >> Francesco Bursi >> >> ------------------------------ >> *Da:* QGIS-Developer <[email protected]> per conto >> di Alister Hood <[email protected]> >> *Inviato:* martedì 13 aprile 2021 14:10 >> *A:* [email protected] <[email protected]> >> *Oggetto:* Re: [QGIS-Developer] GSoC 2021 QGIS On-the-fly Raster >> Calculator proposal draft review and feedback >> >> >> Hi, >> This functionality would be great, but as a user, I can't help thinking >> the proposal is to implement it in the wrong way. >> >> If implemented as a renderer, as described, you could conceivably use an >> expression that uses other layers but not the layer you are supposedly >> rendering. What is displayed would not correspond in any way to the actual >> layer... Bizarre. >> >> Would it not be possible to instead implement a "virtual raster" >> *provider*? Add a checkbox in the raster calculator labelled "create as >> virtual raster". Create a new layer that can be styled using the existing >> renderers and behaves in every way like a non-virtual layer - e.g. the >> right values would be shown using the identify tool and the "value tool" >> plugin, and you could use the layer as an input for other processing tools. >> >> Regards, and best wishes with the proposal, >> Alister >> >> Date: Mon, 12 Apr 2021 12:20:53 +0000 >> From: Francesco Bursi <[email protected]> >> To: qgis-developer <[email protected]> >> Subject: [QGIS-Developer] GSoC 2021 QGIS On-the-fly Raster Calculator >> proposal draft review and feedback >> Message-ID: >> < >> vi1p190mb038187bb910511b3b6b8b44280...@vi1p190mb0381.eurp190.prod.outlook.com >> > >> >> Content-Type: text/plain; charset="windows-1252" >> >> Hello QGIS Dev, >> >> >> I?m Francesco Bursi, an M.Sc. civil engineer from Italy currently >> enrolled in a Master of Advanced Studies (Level 8 EQF) in giscience and >> geoinformatics at the University of Padua. >> >> I?m really interested in the QGIS (possible) new rendering feature that >> involves raster calculator capabilities, I've already discussed the project >> with mentors Martin Tobias and Peter Petrik and possible co-mentor Roberto >> Marzocchi, they gave me a lot of feedback and advice for the project. >> I would like to share my proposal with you before the final submission. >> Don't hesitate to give me feedback and ask me question/clarification or >> point me out what's missing. >> >> >> proposal 2021< >> https://docs.google.com/document/d/1u8L_L1IJjGCZ3d8Vq8duxHbsHZeyzwqOe3tXa1JcKbs/edit?usp=sharing >> > >> >> >> I'm open to advice, remarks and criticism in order to improve. >> >> I am looking forward to a feedback, thank you for your time. >> >> >> Best regards, >> >> Francesco Bursi >> >> _______________________________________________ >> QGIS-Developer mailing list >> [email protected] >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> > _______________________________________________ > QGIS-Developer mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >
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