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

[Nicolas Cadieux]

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 för Windows 10
>> 
>>  
>> 
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