TELEMAC-MASCARET Forum: Velocity viewer in PostTelemac (QGIS) (1/2)

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TOPIC: Velocity viewer in PostTelemac (QGIS)

Velocity viewer in PostTelemac (QGIS) 7 years 7 months ago #25959

Schmirre
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Posts: 78
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Hello Forum!

I have results from Postel3D (horizontal cross-sections) that I try to visualize in QGIS application PostTelemac. I would like to view the velocities as arrows under "velocity viewer". It works fine until I define the desired coordinate system, where all arrows just vanish.

The contour viewer still works fine though. Do you have any ideas why the velocity arrows disappear?

Kind regards, schmirre!

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Velocity viewer in PostTelemac (QGIS) 7 years 7 months ago #25960

sebourban OFFLINE Administrator Principal Scientist Posts: 814 Thank you received: 219	hello, try using the matplotlib display type (which in my view should be default). Hope this helps, Sébastien.
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Velocity viewer in PostTelemac (QGIS) 7 years 7 months ago #25961

Schmirre OFFLINE Senior Boarder Posts: 78 Thank you received: 1	Thank you Sébastien for your fast reply. Perhaps a stupid question, but how do I change display type? Matplotlib show up as succesfully loaded in the PostTelemac application. Thanks, schmirre!
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Velocity viewer in PostTelemac (QGIS) 7 years 7 months ago #25962

c.coulet OFFLINE Moderator Posts: 3722 Thank you received: 1031	Hi Even matplotlib is well loaded, the latest version of PostTelemac use an openGL display mode by default. You could change this in the main windows where there is a dedicated button... Nevertheless, it's strange if it works well in a default coordinate system and disappear in the right one. Could it be a problem of scale of the arrow? Are the values of velocity components OK? Regards
	Christophe The administrator has disabled public write access. The following user(s) said Thank You: Schmirre

Velocity viewer in PostTelemac (QGIS) 7 years 7 months ago #25975

Schmirre
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Senior Boarder
Posts: 78
Thank you received: 1

Hi!

I actually couldn't find the dedicated button, but anyhow that does not seem to be the problem.

I think, just like you said c.coulet, that the problem could be the scale of the arrow. The arrows actually appear on my map when I choose to view "all the points", but the arrows are totally overscaled, even when I set the "length for 1m" to its minimum value of 0.01 m. See attached picture!

Any ideas?

Many thanks, schmirre

Attachments:

arrows.png (543KB)

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Velocity viewer in PostTelemac (QGIS) 7 years 7 months ago #25977

c.coulet OFFLINE Moderator Posts: 3722 Thank you received: 1031	Hi You don't use the latest version of the plugin so you cannot see the openGL option. What is your coordinate system?
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Velocity viewer in PostTelemac (QGIS) 7 years 7 months ago #25978

Schmirre OFFLINE Senior Boarder Posts: 78 Thank you received: 1	Ah I see, will try and update then. My coordinatesystem is WGS 84 / UTM zone 34N (EPSG 32634). /schmirre
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Velocity viewer in PostTelemac (QGIS) 7 years 7 months ago #25979

Schmirre OFFLINE Senior Boarder Posts: 78 Thank you received: 1	Update: tried with the most recent version. However, switching to matplotlib as rendered did not solve my problem. /schmirre
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Velocity viewer in PostTelemac (QGIS) 7 years 7 months ago #25981

c.coulet OFFLINE Moderator Posts: 3722 Thank you received: 1031	Ok Could you post the result file (at least the last time step) in order to let us try and maybe debug? Regards
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Velocity viewer in PostTelemac (QGIS) 7 years 7 months ago #25983

Schmirre OFFLINE Senior Boarder Posts: 78 Thank you received: 1	Yes! Couldn't attach it here, will be back soon with a link. /schmirre
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