[Qgis-user] QGIS 3.16 Training Manual - Module 8.2.1 - Intersect features

[Wanda Norman]

I am getting the same error in the training module for lesson 6.2.9.  I
have done the lesson twice thinking I had missed a step - but get to the
same point  of extracting the buildings and get the error message.

I am using QGIS 3.1 with Windows 10 on my HP laptop.

Thanks!
Wanda Norman


On Thu, Jan 7, 2021 at 12:23 PM Inna Nogeste <nogeste at outlook.com> wrote:

> I’m working through the training manual and completed all the preceding
> modules and their output files.
>
> When I get to Module 8.2.1
>
>
> https://docs.qgis.org/3.16/en/docs/training_manual/complete_analysis/analysis_combination.html#moderate-ty
>
> to intersect my previous output files I get an error message when I run
> the Intersection tool that a feature in my Overlay layer ’has invalid
> geometry. Please fix the geometry or change the Processing setting to the
> “Ignore invalid input features” option.’
>
>
>
> The overlay layer is a polygonized vector layer createdin a previous
> modeul in the training manual from a raster layer.
>
> The invalid geometry in the polygonized layer represents 1 individual cell
> in the original raster layer. Changing the Processing setting to ”Skip
> (Ignore) Features with Invalid Geometries” doesn’t help and outputs an
> empty layer.
>
>
>
> Has anyone else had problems with this module and the layer files created
> in previous modules?
>
> I’ve noted that the original SRTM_41_19.TIF exercise data is in EPSG 32733
> and not EPSG 32734 as per the other exercise (vector) data and this causes
> issues when you get to Module 8.
>
>
>
> I’m currently documenting discrepancies that I’m finding in the training
> manual and am assuming that I can eventually add them to
> https://github.com/qgis/QGIS-Documentation/issues?q=is%3Aissue+is%3Aopen+label%3AEasy
>
>
>
> Regards,
>
>
>
> Inna Nogeste
>
>
>
> Skickades från E-post <https://go.microsoft.com/fwlink/?LinkId=550986>
> för Windows 10
>
>
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