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root676 / QNEAT3

QNEAT3 - Qgis Network Analysis Toolbox 3
GNU General Public License v3.0
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No output polygons or contours in QGIS 3.16.3 (OS X) #42

Closed mvaneggermond closed 1 year ago

mvaneggermond commented 3 years ago

When running several QNEAT tools (Iso-Areas as Polygons (from Layer), or the Contour version., for instance) the only output is the intrapolation; it The polygon layer is empty.

The Iso-Areas as Pointcloud does output the point cloud. I have 3.16.3-Hannover installed on macOS 10.15. I can confirm that QNEAT works as expected in QGIS 3.14 on the same computer.

When comparing the log between the two versions, it becomes apparent that in QGIS 3.14 QNEAT reaches this step:

[QNEAT3Algorithm] Calculating Iso-Interpolation-Raster using QGIS TIN-Interpolator... [QNEAT3Algorithm] Calculating Iso-Polygons using numpy and matplotlib... [QNEAT3Network][calcIsoPolygons] calculating 500.0-level contours

Whereas in QGIS 3.16 it does not calculate the polygons:

[QNEAT3Algorithm] Calculating Iso-Interpolation-Raster using QGIS TIN-Interpolator... [QNEAT3Algorithm] Calculating Iso-Polygons using numpy and matplotlib... [QNEAT3Algorithm] Ending Algorithm

I am happy to send over the data, if that helps. Thanks for looking into this issue!

mira78 commented 3 years ago

Having the same issue, both on QGIS 3.16 and 3.18.

root676 commented 3 years ago

It seems there is an issue with your matplotlib installation on macOS. Unfortunately I have no machine to check this bug. Do the algorithms work on linux/windows for you?

mira78 commented 3 years ago

Can't check linux/windows, unfortunately don't have a device. Tried to install/re-install matplotlib manually, including from various older python versions as well as separate matplotlib download and installation - but nothing helped. Any information/data/files I can provide to help?

Just re-installed QGIS 3.14 and the polygons are calculated and shown without any issue.