formula for converting DD to DMS (waypoints)?

Posted on 2005-04-10
Medium Priority
Last Modified: 2012-06-22
using the WGS-84 (NAD-83) datum

what is the formula for converting the following:

Degree Decimal  Example: lat = 37.379   lon = -122.061


Degree Minute Second Example: lat= 37°22'44.4" N   lon = 122° 2'39.6" W

Please explain how to determine the N/W portions of the waypoint

Question by:IElite
LVL 85

Assisted Solution

ozo earned 1000 total points
ID: 13750501
Degree = floor(37.379)
Minute = floor((37.379-Degree)*60)
Second = ((37.379 - Degree) *60 - Minute) * 60

Expert Comment

ID: 13750815
decimal to minutes : (replace ceiling function with int if negative value)
deg = int(lat)
min = int((lat-deg)*60)
sec = ((lat-deg)*3600) % 60

minute to decimal :

lat = deg + min/60 + sec/3600

* same for lon
** -/+ sign : if MINUS is used , ceiling function must replace the integer function
LVL 31

Accepted Solution

GwynforWeb earned 1000 total points
ID: 13754915
  All the equations you will use will have trigonometric function in them (eg, sin, cos etc). You  will require radians not degrees to use your formulea, just convert the degrees into radians ie

radians = 2*Pi*degrees/360

and use those values in the formulea

lonRadians= 37.379*2*Pi*degrees/360


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