[Qgis-user] QGIS Model Designer

[Ujaval Gandhi]

The batch processing and modeler are mising the 'iterate' feature, and this
type of batch processing + merge functionality will be useful. I have a
tutorial on how to write a bit of pyqgis code to do this that shows exactly
the use case you have. But it can be used with any other processing
algorithm.
https://www.qgistutorials.com/en/docs/3/processing_algorithms_pyqgis.html
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Ujaval Gandhi
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On Mon, Jan 10, 2022 at 4:52 PM Richard McDonnell <richard.mcdonnell at opw.ie>
wrote:

> Hi All,
>
> Apologies, but I think I have found a Plugin, which looks promising “Point
> sampling tool” which seems to do what I want.
>
> Regards,
>
>
>
> Richard
>
>
>
> ——
> Richard McDonnell MSc GIS, FME Certified Professional
> *FRM Data Management*
>
> ——
> Oifig na nOibreacha Poiblí
> Office of Public Works
>
> Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
> Jonathan Swift Street, Trim, Co Meath, C15 NX36
> ——
> M +353 87 688 5964 T +353 46 942 2409
> https://gov.ie/opw
>
> ——
> To send me files larger than 30MB, please use the link below
> https://filetransfer.opw.ie/filedrop/richard.mcdonnell@opw.ie
>
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>
> *From:* Qgis-user <qgis-user-bounces at lists.osgeo.org> *On Behalf Of *Richard
> McDonnell
> *Sent:* 10 January 2022 11:18
> *To:* qgis-user at lists.osgeo.org
> *Subject:* [Qgis-user] QGIS Model Designer
>
>
>
> Hi all.
>
> I have been asked to sample over 100 raster pixel values using a single
> point file.
>
> I can use the “Sample raster values” Tool, but this only outputs for one
> Raster. I have looked at batching this, but it will produce 100’s of point
> files which I will have to merge together. So I was looking at using the
> Model Designer, but again it can’t accept multiple raster inputs.
>
>
>
> What I would like to know, is how I might easily create a single shapefile
> with a column for each raster containing the sampled value. The easiest way
> would be to somehow sample the first raster saving the output then loop
> back to the second raster, but this time using output from the first
> sampling to sample the second. This looping would continue until all
> raster’s had been sampled.
>
>
>
> Any help appreciated.
>
> Regards,
>
>
>
> Richard
>
>
> * ——*
> *Richard McDonnell MSc GIS, FME Certified Professional*
> *FRM Data Management*
>
> ——
> *Oifig na nOibreacha Poiblí*
> Office of Public Works
>
> *Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36 *
> Jonathan Swift Street, Trim, Co Meath, C15 NX36
> ——
> M +353 87 688 5964 T +353 46 942 2409
> https://gov.ie/opw
>
> ——
> To send me files larger than 30MB, please use the link below
> https://filetransfer.opw.ie/filedrop/richard.mcdonnell@opw.ie
>
> Email Disclaimer:
> https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/
>
>
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