[Qgis-user] azimuth offset 0.32 added to all drawn segments in Azimuth and Distance plugin

[Jeremy Jackson]

On 2023-09-26 14:31, qgis-user-request at lists.osgeo.org wrote:

Hi Jeremy,
it looks like the issue is due to the fact that, while the "Azimuth and
Distance" plugin always uses the planimetric azimuth/bearing and the
planimetric distance (i.e. calculated on the Cartesian plane of the
Project CRS), the Measure Bearing tool returns the bearing angle
measured on the ellipsoid set for the current Project (in
Project->Properties...->Measurements->Ellipsoid), instead.

If you set the Project ellipsoid to "None / Planimetric", than the
Measure Bearing tool will return the planimetric bearing angle (i.e.
measured on the Cartesian plane of the Project CRS).

You can also use the "Azimuth Measurement Map Tool" plugin which allow
to switch between Cartesian and ellipsoidal measurement directly in the
tool window.

Best regards.

Andrea

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I wonder if it is safe to use a custom ellipsoid, which matches your local site altitude ?
Would this give me "ground" distances and bearings?

I am also interested in contributing to the Azimuth and Distance plugin, to use a Combined Scale Factor, so that ground distances may be entered directly from a legal survey.

The same goes for bearings, if a meridian convergence factor could be set, to allow bearings to be entered directly from a survey.  The existing Magnetic North facility seems to be useful for rotating the surveys using astronometric bearings, to GNSS true north, so this would be an additional feature.