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

Wed Jan 13 13:39:05 PST 2021

Inna,

Thank you for the detailed directions.  I was able to correct the issue and
move on with the lesson.  I appreciate the help everyone has provided!

Wanda

On Wed, Jan 13, 2021 at 5:42 AM Inna Nogeste <nogeste at outlook.com> wrote:

> Hi Wanda,
>
>
>
> When running QGIS Tools the default output is a temporary layer with the
> words ”[Create temporary layer]” greyed out in the output sections which
> indicate that a temporary layer will be created as the output layer.
>
> You have the option of saving your output to a permanent layer within QGIS
> tools, in this instance to 3 permanent layers (Valid output, Invalid output
> and Error output), by clicking on the … button to the far right of the
> output box.
>
> The temporary layers can be exported to permanent layers by right clicking
> on them in the Layers panel and selecting Export > select the option you
> want.
>
> The Valid output shows the valid features in your input which have no
> topological/geometric errors. The Invalid output and Error output layers
> will show you where you have geometry errors.
>
> Using your invalid and error layers, zoom to the problematic areas and
> edit the errors, for example, moving vertices so that they snap to the
> adjoining vertices, or perhaps close polygons so that the start and end
> vertices snap to each other.
>
> After you’ve fixed the errors it’s good to run the tool again in case
> something has been missed.
>
> This QGIS page has an explanation of the Check validity tool and its
> output layers
> https://docs.qgis.org/3.16/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html?highlight=check%20validity#check-validity
>
> This QGIS page explains Snapping so that your vertices for the respective
> layers snap to each other’
>
>
> https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html?highlight=snapping#index-1
>
>
>
> This is a good forum to ask questions if you need help.
>
>
>
> Regards,
>
> Inna Nogeste
>
>
>
> *Från: *Wanda Norman <wanda.mnorman2015 at gmail.com>
> *Skickat: *den 12 januari 2021 22:47
> *Till: *Inna Nogeste <nogeste at outlook.com>
> *Kopia: *Alexandre Neto <senhor.neto at gmail.com>; qgis-user
> <qgis-user at lists.osgeo.org>
> *Ämne: *Re: [Qgis-user] QGIS 3.16 Training Manual - Module 8.2.1 -
> Intersect features
>
>
>
> Thank you for the information.  I did find that my project projection was
> different then the vector analysis so I changed that to match.  I also
> tried the vector/Geometry tools/Check Validity.  It gives me new temporary
> layers but I don't understand what to do with them.  Sorry, I am trying to
> understand - but I feel like I am still missing something.
>
>
>
>
>
> On Tue, Jan 12, 2021 at 1:18 PM Inna Nogeste <nogeste at outlook.com> wrote:
>
> The tutorial needs a lot of love to get it to the same level as the User
> Guide 😊 I have a background in documentation but currently don’t have
> time to devote all the time that is required to update the text,
> screengrabs, URLs etc. I’ve encountered more issues today such as WMS and
> WFS URLs/hyperlinks no longer working and more but currently don’t have the
> time to go through any more tutorial pages.
>
> I’ll do what I can when I can.
>
> Could updating the tutorial be sponsored if deemed sufficiently important
> to update?
>
> Regards,
>
> Inna Nogeste
>
> *Från: *Alexandre Neto <senhor.neto at gmail.com>
> *Skickat: *den 11 januari 2021 19:44
> *Till: *Inna Nogeste <nogeste at outlook.com>
> *Kopia: *Wanda Norman <wanda.mnorman2015 at gmail.com>; qgis-user
> <qgis-user at lists.osgeo.org>
> *Ämne: *Re: [Qgis-user] QGIS 3.16 Training Manual - Module 8.2.1 -
> Intersect features
>
>  Sure!
>
> Add a comment on github with @SrNetoChan to mention me.
>
> Thanks for your help! The training manual needs some love, but most
> resources are directed to the user manual.
>
> Alexandre Neto
>
>
>
> A segunda, 11/01/2021, 17:37, Inna Nogeste <nogeste at outlook.com> escreveu:
>
> Hi Alexandre,
>
> Thanks for your YouTube links, they help alot. I have made alot of notes
> to date as to what should be updated in the QGIS 3.16 Training Manual and
> will gradually add these to Git Hub using your YouTube instructions.
>
> I’ll let you know when I’ve started so that you can perhaps check that I
> have done it correctly?
>
> Regards,
>
> Inna Nogeste
>
> *Från: *Alexandre Neto <senhor.neto at gmail.com>
> *Skickat: *den 11 januari 2021 16:17
> *Till: *Inna Nogeste <nogeste at outlook.com>
> *Kopia: *Wanda Norman <wanda.mnorman2015 at gmail.com>; qgis-user
> <qgis-user at lists.osgeo.org>
> *Ämne: *Re: [Qgis-user] QGIS 3.16 Training Manual - Module 8.2.1 -
> Intersect features
>
>  Hello Inna,
>
>  If you want, I can help you make the change yourself :-)
>
>  Or, alternatively, check the following videos to see how you can do it
>
>  QGIS Documentation made easy - Part 1
>
>  https://youtu.be/PCiohDt-OBk
> <https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyoutu.be%2FPCiohDt-OBk&data=04%7C01%7C%7C9ac082157a034210862608d8b7439dec%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637460848318479612%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=nv%2Bzh4EpCnLhq5qK4o3OmNxSBlpB5KLb4Ick4yBWgOI%3D&reserved=0>
> - part 1
>
>  https://youtu.be/19Bj0uXcdfU
> <https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyoutu.be%2F19Bj0uXcdfU&data=04%7C01%7C%7C9ac082157a034210862608d8b7439dec%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637460848318489606%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=RYT6D4fFVNBTVyHCAgIHLkMUb4ML6VWRzpku2uTtpeM%3D&reserved=0>
> - part 2
>
>  Thanks
>
>  Alexandre Neto
>
> On Mon, Jan 11, 2021 at 12:23 PM Inna Nogeste <nogeste at outlook.com> wrote:
>
> 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
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> för Windows 10
>
>
>
> *Från: *Wanda Norman <wanda.mnorman2015 at gmail.com>
> *Skickat: *den 8 januari 2021 15:31
> *Till: *Inna Nogeste <nogeste at outlook.com>
> *Kopia: *qgis-user <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> 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%7C9ac082157a034210862608d8b7439dec%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637460848318499600%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=2Pebak7fl6BMVE%2BY0gJ%2BIRdfwaD0oiz9rTm57Fv8U4E%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%7C9ac082157a034210862608d8b7439dec%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637460848318509596%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=5qKUdW3pI6pWpuSedgdRWZW3e7Mz0bHrKt%2Bhc%2F%2Fw%2FDI%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%7C9ac082157a034210862608d8b7439dec%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637460848318509596%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=r1uodFBTcWOVmSLHDwzH96y5SGFT0EGBK%2B0%2Fv%2FzPPN4%3D&reserved=0>
> för Windows 10
>
>
>
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