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

Mon Jan 11 04:20:02 PST 2021

Thanks to everyone for their replies.

I haven’t used the Checck Validity tool and will do so.
I understand that some of the material is outdated and is why I thought I’d go through it now that I have upgraded to 3.16 to see what updates might be required. I’ll post my suggested updates to GiHub when I’m finished.

Regards,
Inna Nogeste

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Från: Alexandre Neto<mailto:senhor.neto at gmail.com>
Skickat: den 8 januari 2021 16:54
Till: Nicolas Cadieux<mailto:njacadieux.gitlab at gmail.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

Also, please beware that some of these training materials may be outdated, and for instance may have been written before the Check Validity in processing was implemented.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<mailto: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<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.com%2Fnjacadieux&data=04%7C01%7C%7C22c9f81eed6b4cd0952508d8b3ed9d03%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637457180407285622%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=WiNYqfh2ulPzTPJaqHibrUNPboYEt0bC9cdb%2FcFgOds%3D&reserved=0>

Le 8 janv. 2021 à 09:31, Wanda Norman <wanda.mnorman2015 at gmail.com<mailto: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<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%7C22c9f81eed6b4cd0952508d8b3ed9d03%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637457180407285622%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=ln34NXFjJbUI3pCDturoO%2BM2LBHv1QGg%2BSZzMZ33Dpw%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%7C22c9f81eed6b4cd0952508d8b3ed9d03%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637457180407295615%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=ixe8os5vcwSmDbUHvLeLHXBU6moIknfnSZT837kMl9U%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%7C22c9f81eed6b4cd0952508d8b3ed9d03%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637457180407305609%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=J2h%2FklKWS4AyKNvKYSy4I5lkTenfw8SlAxK7524LK2w%3D&reserved=0> för Windows 10

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