Wrong arrow indication for Sentinel-1 wind direction

[wolterse]

What is the bug or the crash?

We discovered a potential issue in QGIS for Windows 3.18.

Sentinel-1 OCN Wind Speed and Wind Direction data were imported into QGIS, the wind direction as a vector layer. As you can see in the accompanying screen shot, the wind direction for the arrow highlighted in bright red is 256 degrees. Wind direction in this data layer is following the meteorological convention, i.e., the direction from which the wind is blowing, increasing clockwise from the North.

It seems that a different arrow plotting convention is used in QGIS 3.18 and that the arrow indicates the direction to which the wind is blowing, so 180 degrees opposite to the meteorological convention.

Can this be confirmed or further assessed?

Steps to reproduce the issue

See the print screen.

Versions

QGIS for Windows 3.18

Supported QGIS version

• [ ] I'm running a supported QGIS version according to the roadmap.

New profile

• [ ] I tried with a new QGIS profile

Additional context

No response

[Pedro-Murteira]

@wolterse Hello, could you give it a try on the supported versions? (3.22 or 3.24)

[wolterse]

@wolterse Hello, could you give it a try on the supported versions? (3.22 or 3.24)

We tried in QGIS 3.24, but the same issue shows up there as well, see the print screen.

[Skimkat]

Have you resolved this matter? I have the same issue but I don't think it is a QGIS issue. The convention used by sentinel is arrow in the direction into which the wind blow (why I have no idea!). Also some plugins in QGIS e.g. the wind effect is this opposite direction so you have to provide the degrees in the opposite. This is extremely confusion because the meteorological convention is that wind is indicated from where it originate.