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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 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.
This works nicely to set/update the coordinates, however, you will lose some of the original Exif Data! What should be done is first fetch the original exif data and then just update the GPS
tags:
gps_exif = {"GPS": gps_ifd}
# get original exif data first!
exif_data = piexif.load(file_name)
# update original exif data to include GPS tag
exif_data.update(gps_exif)
exif_bytes = piexif.dump(exif_data)
piexif.insert(exif_bytes, file_name)
See the two images below where the exif properties on the left are done without fetching the original exif data first, while the ones on the right do get the original exif data first and then just updates the gps tags:
This was really helpful, thank you. I think there's a small error on line 53. GPSAltitudeRef=1
means below sea level. I guess that's normal for some people, but for most folks you probably want:
piexif.GPSIFD.GPSAltitudeRef: 0,
How would I add datetime_original
or model
to the metadata?
Hi, I want to write transformed coordinates into the exif. Values like 3570178.732528623!
I am getting struct.error: argument out of range in the dump method. Please advise.