Functions of loxodrome or rhumb line is needed

[AkexStar]

I have did a lot of surveys, but found that there is few libs about rhumb_inverse and rhumb_direct.
I noticed that Geographiclib has a solution for rhumb, but does not support python.
pyproj has geodesic.inv_intermediate and geodesic.fwd_intermediate for great-circle(geodesic), but lacks of functions to calculate rhumb line.

Rhumb Line is very important for air/sea track calculation.
I hope that there will be funtions just similar to geodesic.fwd_intermediate to compute rhumb line.

I will be very grateful if any developer could reply me.

[snowman2]

The geodesic functions use c functions from PROJ which are imported from the GeographicLib library you reference (https://proj.org/en/9.2/geodesic.html). To get the logic in pyproj, the logic will need to be added to PROJ first.

See: https://github.com/OSGeo/PROJ/

[AkexStar]

@snowman2
Thank you! I'll go to PROJ and raise an Issue

[snowman2]

Related:

• https://github.com/jrversteegh/geofun
• Functions of loxodrome or rhumb line are needed OSGeo/PROJ#3855

[jjimenezshaw]

Some people showed in the ticket in PROJ (OSGeo/PROJ#3855) how to easily compute a loxodrome using the Mercator projection. Should this issue be closed?

[snowman2]

Do you think that their suggestion is worth documenting?

[jjimenezshaw]

OSGeo/PROJ#3855 (comment)
I don't know if it is worth it, maybe.