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

[Inna Nogeste]

Hi Wanda,

Looking at my notes for what wasn’t working for me in the Training Manual exercises, I see that I needed to make the following change in Step 6.2.8 using QGIS 3.16 :
“Need to set the processing option to Skip (Ignore) invalid geometry. Seemed to be a problem with the buildings_34s layer? Changed this option for both input and compare layers and it worked.”

I hope this helps!

Regards,
Inna Nogeste


Skickades från E-post<https://go.microsoft.com/fwlink/?LinkId=550986> för Windows 10

Från: Wanda Norman<mailto:wanda.mnorman2015 at gmail.com>
Skickat: den 8 januari 2021 15:31
Till: Inna Nogeste<mailto:nogeste at outlook.com>
Kopia: qgis-user<mailto:qgis-user at lists.osgeo.org>
Ämne: Re: [Qgis-user] QGIS 3.16 Training Manual - Module 8.2.1 - Intersect features

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<mailto: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<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.qgis.org%2F3.16%2Fen%2Fdocs%2Ftraining_manual%2Fcomplete_analysis%2Fanalysis_combination.html%23moderate-ty&data=04%7C01%7C%7Ce764d917899e4aab226008d8b3e2108e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637457130804438957%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=xqof971dMiu5MTBriuR3MnoyIW7xMjjHdP4XxKm52O0%3D&reserved=0>
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<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fqgis%2FQGIS-Documentation%2Fissues%3Fq%3Dis%253Aissue%2Bis%253Aopen%2Blabel%253AEasy&data=04%7C01%7C%7Ce764d917899e4aab226008d8b3e2108e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637457130804448949%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=CUXs9ubf%2BONzGbCaKI3wzjhPBm74tciB4Hxpet8Boxw%3D&reserved=0>

Regards,

Inna Nogeste

Skickades från E-post<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgo.microsoft.com%2Ffwlink%2F%3FLinkId%3D550986&data=04%7C01%7C%7Ce764d917899e4aab226008d8b3e2108e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637457130804448949%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=5kIFO%2FWgCdwjS27my%2F9KTkKPsSBtqtuZF%2FzSBmWskh8%3D&reserved=0> för Windows 10

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