[Qgis-user] Angle of view

[Matt Boyd]

It sounds like you want to calculate the bearing or azimuth from the
camera position to each point on the raster. This would give you the
direction from the camera to the position, then rotate the result so
it aligns with the direction of the camera. You could probably just
create the basic plot once and then just rotate it to match the camera
direction each time.
I'd do it using a regular grid of points and the calculator, then
interpolate that onto a raster if thats what you want.
essentially arctan(dy/dx) with some rotation and conversion from
radians to degrees.

I've done something similar in python, but for flow direction between
nodes in a drainage network, might be overkill.

Good luck

On Fri, Jun 25, 2021 at 4:09 AM Surya Jarausch <dasrad at gmail.com> wrote:
>
> Dear Qgis-Users,
>
> I am relatively new to Qgis and working on a project to georeference webcam-images and then determine the areas covered with snow.
>
> To get an estimation of the quality of the projection, I would like to create a raster with the values of the angle of view from a certain point – the camera position. If the angle is near 90° the projection is likely to be accurate, the more it becomes an pointed angle, the bigger possible errors will get.
>
> I already created a viewshed to determine the visible areas of the DEM.
>
>
>
> I would be grateful if you could help me out,
>
> Surya.
>
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