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

[Alexandre Neto]

Also, please beware that some of these training materials may be outdated,
and for instance may have been written before the Check Validity in
processing was implemented.

Alexandre Neto

On Fri, Jan 8, 2021 at 3:29 PM Nicolas Cadieux <njacadieux.gitlab at gmail.com>
wrote:

> Hi,
>
> Have you tried fixing the geometry?  Go to vector/Geometry tools/Check
> Validity.
> Try both QGIS and GEOS methods. Topology Checker Plugin (that need to be
> installed under Plugins) also works well.
>
> Nicolas Cadieux
> https://gitlab.com/njacadieux
>
> Le 8 janv. 2021 à 09:31, Wanda Norman <wanda.mnorman2015 at gmail.com> a
> écrit :
>
> 
> 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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