[postgis-users] magnetic bearing to true bearing

[Basques, Bob (CI-StPaul)]

Paul,

Not eactly what you were asking for, but this service will output a standardized declination Arrow based on the location in LAT/LON and a DATE of capture for magnetic north (It keeps moving) :

https://mdd.sharedgeo.org/mdd-gen?date=2016.5&lat=44.95&lon=-93.1&zone=15

It’s intended for automated map making.  I thinkk there is a link around that may also output the particulars of the settings used for the image output.  I know it exists, but I think it’s still in development.

bobb



On Feb 7, 2020, at 8:14 AM, paul.malm at lfv.se<mailto:paul.malm at lfv.se> wrote:

Think Before You Click: This email originated outside our organization.

Hi, list!
I’m writing a program reading a file and creating graphical objects.
I have a starting point (lat/lon WGS 84), a length (m) and a magnetic bearing (degrees).
I would like to automatically convert the magnetic bearing to a true bearing when they occurs in the file I’m reading.
Is there a converter in PostGis that can be used, or is there another way my program can get the declamation?
Kind regard,
Paul

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