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spatialthoughts / qgis-tutorials

Source files for sphinx-based website
http://www.qgistutorials.com
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Locating Nearest Facility with Origin-Destination Matrix (QGIS3) — QGIS Tutorials and Tips #132

Closed utterances-bot closed 7 months ago

utterances-bot commented 8 months ago

Locating Nearest Facility with Origin-Destination Matrix (QGIS3) — QGIS Tutorials and Tips

https://www.qgistutorials.com/en/docs/3/origin_destination_matrix.html

KrisLaw98 commented 8 months ago

In step #9 OBJECTID_1 does not exist. Is there an alternative?

spatialthoughts commented 8 months ago

It has an OBJECTID field. Use that.

@VignaPurohit Please review and update the tutorial. The layer name also is different (Community-Based Service Provider).

KrisLaw98 commented 8 months ago

Thank you for your response. I tried it again but this time I used the image example in #10's topology tolerance instead of what was in the instructions. It now works fine.

songchoi commented 7 months ago

in #11, no. of origin points are 41 not 13. So, you should correct it.

VignaPurohit commented 7 months ago

@songchoi Thank you for pointing out. I will update it.

spatialthoughts commented 7 months ago

Fixed in https://github.com/spatialthoughts/qgis-tutorials/pull/138

burak-irtel commented 4 months ago

When I run OD Matrix from Layers as Line algorithm, it stops at 100% and keep calculating and doesn't end. I waited for 10 mins but it didn't end. Why it's happening?

SHsabbir25 commented 2 weeks ago

@spatialthoughts What is topology tolerance actually, and why do we set the topology tolerance as 0.0000150 in the 10-number process?

spatialthoughts commented 1 week ago

@SHsabbir25 As described in the documentation, it is a setting that Tolerate gaps in network (crs units). That means that lines with nodes closer than the specified tolerance are considered connected. A the units as in the CRS, that number is in degrees and approximates to 1 meter. If the vector layer is in a CRS with units as meters, you can specify it as 1.