QGIS drawing segment of azimuth from values defined

Question

I have the range of azimuth defined in the data attribute table as you see below:

And as a result, I want to have some visual section of the bearing, determined by the azimuth I and azimuth II values in my data attribute table.

Is it possible in QGIS?

Do you mean 'as depicted in the linked image' ?
– Snaileater
Commented Jul 2, 2021 at 9:37 — Snaileater, Commented Jul 2, 2021 at 9:37
yes, i want something like shown in the image,
– Geographos
Commented Jul 2, 2021 at 9:44 — Geographos, Commented Jul 2, 2021 at 9:44

Babel · Accepted Answer · 2021-07-02 15:07:58Z

7

wedge_buffer( 
    $geometry, 
    azimuth1+(azimuth2-azimuth1)/2,
    azimuth2-azimuth1,
    10000
)

To change the size (radius), adapt the number on the 2nd last line (here: 10000). See here for details.

When working with angles, be sure to use an appropriate CRS (one that preserves angles like Mercator projection) - see 2nd screenshot.

Difference between EPSG:4326 (blue) and EPSG:3857 (red), using the same expression:

answered Jul 2, 2021 at 9:43

Babel

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Yes, it works. How to restrict it to a few kilometers instead of a whole globe? The range is endless now.
– Geographos
Commented Jul 2, 2021 at 9:50
You probably used a geographic CRS with units in degrees, that's why it gets so huge. See updated answer how to change that. Howver, be aware: when working with angles, best use a CRS that returns equal angles. So here, a mercator projection is a good option (I used WebMercator / EPSG:3857).
– Babel
Commented Jul 2, 2021 at 9:55

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