Skip to content

Instantly share code, notes, and snippets.

@chrisjsimpson
Forked from jeteon/dms2dec.py
Created April 1, 2019 12:17
Show Gist options
  • Save chrisjsimpson/076a82b51e8540a117e8aa5e793d06ec to your computer and use it in GitHub Desktop.
Save chrisjsimpson/076a82b51e8540a117e8aa5e793d06ec to your computer and use it in GitHub Desktop.
Convert coordinates in DMS notation to decimal in Python.
#!/env/python
# coding=utf8
"""
Converting Degrees, Minutes, Seconds formatted coordinate strings to decimal.
Formula:
DEC = (DEG + (MIN * 1/60) + (SEC * 1/60 * 1/60))
Assumes S/W are negative.
"""
import re
def dms2dec(dms_str):
"""Return decimal representation of DMS
>>> dms2dec(utf8(48°53'10.18"N))
48.8866111111F
>>> dms2dec(utf8(2°20'35.09"E))
2.34330555556F
>>> dms2dec(utf8(48°53'10.18"S))
-48.8866111111F
>>> dms2dec(utf8(2°20'35.09"W))
-2.34330555556F
"""
dms_str = re.sub(r'\s', '', dms_str)
sign = -1 if re.search('[swSW]', dms_str) else 1
numbers = [*filter(len, re.split('\D+', dms_str, maxsplit=4))]
degree = numbers[0]
minute = numbers[1] if len(numbers) >= 2 else '0'
second = numbers[2] if len(numbers) >= 3 else '0'
frac_seconds = numbers[3] if len(numbers) >= 4 else '0'
second += "." + frac_seconds
return sign * (int(degree) + float(minute) / 60 + float(second) / 3600)
@chrisjsimpson
Copy link
Author

Updated for python 3

@yonis-hub
Copy link

@chrisjsimpson, Do you happen to have way to do the batch conversion for cvs file example?

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment