Convert bearings in "Decimal Degree" to "Degree Minute Second" in QGIS

  Here I got attribute column of bearings for some lines in "Decimal Degree" and I want to convert them to "Degree Minute Second" with each unit in a separate attribute column.

The conversion factor is as follow:-

• 1° = 60'
• 1' = 60"
• 1° = 3600"

Note that the bearings where generated using the azimuth expression listed below:-

degrees( azimuth( start_point($geometry), end_point($geometry) ) )

The conversion

As an example, lets convert this 104.580420 (which is in Decimal Degree) to Degree Minute Second.

• Degree = INT(104.580420) = 104°
• Minute = INT((104.580420 - 104) * 60) = 34'
• Seconds = (34.82520000000022 - 34) * 60 = 49.512"

Therefore, the result of 104.580420 is: 104° 34' 49.512"

brg = 104.580420

try:
    # Making sure the brg is a float number...
    brg = float(brg)
    
    # Degree...
    brg_degree = int(brg)

    # Minute
    brg_minute = int((brg - brg_degree) * 60)

    # Second
    brg_second = round( (((brg - brg_degree) * 60) - brg_minute) * 60, 2)

    # Display or return the result...
    print(str(brg_degree) +'° '+ str(brg_minute) +"' "+ str(brg_second) +'" ')
    
except ValueError:
    
    print('Error: Invalid Bearing')

The code above can now be added as a function expression in QGIS field calculator to create a new column like this...

from qgis.core import *
from qgis.gui import *

@qgsfunction(args='auto', group='Custom')
def bearing_func(brg, feature, parent):
    try:
        # Making sure the brg is a float number...
        brg = float(brg)
        
        # Degree...
        brg_degree = int(brg)

        # Minute
        brg_minute = int((brg - brg_degree) * 60)

        # Second
        brg_second = round( (((brg - brg_degree) * 60) - brg_minute) * 60, 2)

        # Display or return the result...
        return str(brg_degree) +'° '+ str(brg_minute) +"' "+ str(brg_second) +'"'
        
    except ValueError:
        
        return 'Error: Invalid Bearing'

Note that the output field type is set to 'Text (String)' because of the symbols used in the result.

That is it!