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@c060604 c060604/exif.py
Created May 23, 2017

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User python and piexif to write some gps info into jpg pictures.
import os
import piexif
from fractions import Fraction
def to_deg(value, loc):
"""convert decimal coordinates into degrees, munutes and seconds tuple
Keyword arguments: value is float gps-value, loc is direction list ["S", "N"] or ["W", "E"]
return: tuple like (25, 13, 48.343 ,'N')
"""
if value < 0:
loc_value = loc[0]
elif value > 0:
loc_value = loc[1]
else:
loc_value = ""
abs_value = abs(value)
deg = int(abs_value)
t1 = (abs_value-deg)*60
min = int(t1)
sec = round((t1 - min)* 60, 5)
return (deg, min, sec, loc_value)
def change_to_rational(number):
"""convert a number to rantional
Keyword arguments: number
return: tuple like (1, 2), (numerator, denominator)
"""
f = Fraction(str(number))
return (f.numerator, f.denominator)
def set_gps_location(file_name, lat, lng, altitude):
"""Adds GPS position as EXIF metadata
Keyword arguments:
file_name -- image file
lat -- latitude (as float)
lng -- longitude (as float)
altitude -- altitude (as float)
"""
lat_deg = to_deg(lat, ["S", "N"])
lng_deg = to_deg(lng, ["W", "E"])
exiv_lat = (change_to_rational(lat_deg[0]), change_to_rational(lat_deg[1]), change_to_rational(lat_deg[2]))
exiv_lng = (change_to_rational(lng_deg[0]), change_to_rational(lng_deg[1]), change_to_rational(lng_deg[2]))
gps_ifd = {
piexif.GPSIFD.GPSVersionID: (2, 0, 0, 0),
piexif.GPSIFD.GPSAltitudeRef: 1,
piexif.GPSIFD.GPSAltitude: change_to_rational(round(altitude)),
piexif.GPSIFD.GPSLatitudeRef: lat_deg[3],
piexif.GPSIFD.GPSLatitude: exiv_lat,
piexif.GPSIFD.GPSLongitudeRef: lng_deg[3],
piexif.GPSIFD.GPSLongitude: exiv_lng,
}
exif_dict = {"GPS": gps_ifd}
exif_bytes = piexif.dump(exif_dict)
piexif.insert(exif_bytes, file_name)
@Avi1git

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commented Jan 11, 2019

Hi, I want to write transformed coordinates into the exif. Values like 3570178.732528623!

breite = exif_dict['GPS'][piexif.GPSIFD.GPSLatitude]
lange = exif_dict['GPS'][piexif.GPSIFD.GPSLongitude]
 
breite = breite[0][0] / breite[0][1] + breite[1][0] / (breite[1][1] * 60) + breite[2][0] / (breite[2][1] * 3600)
lange = lange[0][0] / lange[0][1] + lange[1][0] / (lange[1][1] * 60) + lange[2][0] / (lange[2][1] * 3600)
x, y = pyproj.transform(wgs84, gk3, lange, breite)

exif_dict['GPS'][piexif.GPSIFD.GPSLatitude] = [ ( (int)(round(y,6) * 1000000), 1000000 ), (0, 1), (0, 1) ]
 
exif_bytes = piexif.dump(exif_dict)

I am getting struct.error: argument out of range in the dump method. Please advise.

@bluems

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commented Apr 8, 2019

@Avi1git Hi.
The Float number your 3570178.732528623 is Rectangular Coordinate System. no GPS.
First, You must study to diffrent GPS and RCS.
You can find if the RCS can not be converted to GPS immediately.

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