QGIS Model Builder / Graphical Modeler (Version 3.x)

[@hanshanszoon]

Thank you! You have taught me much about QGIS in the last weeks while I watched your videos. I only knew how to use ArcGIS, but I like QGIS more I think. You go through the steps and errors without much editing, which gives me time to process the information. Others cut their videos down to save time, but that makes the pace too fast. I would like to see a more elaborate example of the graphical modeler, so I am going to check your uploads now.

[@sarahmutua3108]

Thank you for the clear illustration. What do you incase the analysis includes clipping many maps

[@carmenroseyacub6924]

Thanks for demonstrating this model builder it was really helpful for me:)

[@johnpoc6594]

Just what I was looking for! Thank you very much

[@geospatialschool]

You are welcome!

[@mygisable]

Thank you so much! How do you get back to the algorithm parameter dialog?

[@alconomic476]

Thanks a bunch, this was exactly what I needed!

[@paxtonmoises4634]

A trick : you can watch series at Flixzone. I've been using them for watching loads of movies recently.

[@kevinwalker5155]

@Paxton Moises Yup, I've been watching on Flixzone} for years myself :D

[@wilsononyx4750]

@Paxton Moises yea, I've been watching on flixzone} for since november myself =)

[@sadiqalmalki1589]

Thank you for your video, I have a question, I would to classify wetlands according to water index and NDVI index, how can I make a condition for raster e,g if water index >1 this cell is water, and if water index < 1 and NDVI > 0.5 is high vegetation, another condition e.g if water index

[@geospatialschool]

With QGIS you can use raster calculator multiple times to create intermediate layers, then do another raster calculator to combine the intermediates into the final product. This would be fairly easy with model builder. Personally, I would program it using Python, but you don't have to.

[@salvatorebonfanti7863]

Hi, do you know if is possible operate a confrontation between attributes of the same layer or different?

[@garethcf1016]

For some reason, the process will not indicate what the inputs are ie there is no arrow leading from the inputs to the process

[@MrWebon]

Thank You! You're a great person

[@huseyincobanoglu447]

Hi, wonderfull video. Thanks you. I want to ask for you. I dont want to write to temporary file or new file ? How can ı write to existing file in my changes ?

[@caro_line]

Thanks for this good video! Would be great if you could also show how to set CRS in model builder. I tried serveral ways (input CRS, define projection for layer and so on) but nothing worked.

[@marceljunioregondi5594]

Is this like some what of an automation process. Like instead of repeating a process every other time, you can have this set and let the process automate itself. For example say I want to show number of facilities offering immunization services for different areas of interest. Could this work for such an task.

[@geospatialschool]

Yes, that's correct. You can use model builder to automate workflows. It cold potentially work for your task.

[@marceljunioregondi5594]

@@geospatialschool Thank you will try this out.

[@marceljunioregondi5594]

@@geospatialschool Thank you will try this out.

[@Refreshment01]

One of the best Qgis channels around, thank you for educating us sir. A small request: A video tutorial on how make the Atlas pick up the correct paper size (A4, A3, A2, for example) and orientation to optimally use the paper space at a given scale. i got some of it working, like adjusting between portrait or landscape mode. It does kind of chose a paper size based on the AtladWidth/heigh variable in relation to the total area size of the paper format. However, i don't know how to get the scale value from the Atlas page. And even if i could get the value im not sure the way im implementing this is the best one. But reply or not, anyways thanks for the good work!

[@chapchapkim6723]

thanks for video! if i save this model as phython code, how can i open and use with qgis?

[@geospatialschool]

Open the save python script in the QGIS python console

[@MrDebashishdash]

Could you share the vector shapefile and dem raster file please!? Or may be the source from which both can be downloaded?? Thanks!!Great video

[@hayabusa9954]

How to make stream order today? because when i use qgis , there is no saga

[@catharinacavasin6941]

thank you for the video! It was really helpfull!

[@blabean]

Thank you for nice video Sir, by the way I have a simple question. Isn't there any tool to load raster file automatically? I have so many files to do some analysis. I made my automatically analyzing model, but I cannot find the way to load multiple data in sequence. I need your advice :) Thank you!!

[@geospatialschool]

You might be able to setup up an iterative loop in model builder that cycles through a list of files. But I think the best way would be to write a python script using PyQGIS that does the analysis. I have some youtube videos on PyQGIS. You can also check out my full PyQGIS course: opensourceoptions.com/course/pyqgis-learn-the-qgis-python-api/

[@blabean]

@@geospatialschool Thank you Sir, I think your course is the 'ONLY' and "BEST" for learning QGIS. I will pay for your PyQGIS today :) I needed those course By the way, I followed your PyQGIS for importing raster image(png format). But I saw that your code make the process automatically, while my code create a window 'Coordinate Reference System Selector' continuously.... Does it because my image don't have any crs? How to make it stop to create the window? Again, thank you for nice tutorials!

[@geospatialschool]

Yes, it's probably because your raster doesn't have a crs assigned. If you assign the crs before importing the window should not appear.

[@mattiyito1]

Thank you so much

[@willerfagundesdeoliveira3261]

incredible!!!

[@diegoaraujo4966]

Thank you!

[@geospatialschool]

You're welcome!

[@eduardograjales9959]

Cool