Created
December 21, 2017 09:53
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Extract GPS & Exif Data from Images using Python
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from PIL import Image | |
from PIL.ExifTags import TAGS, GPSTAGS | |
class ImageMetaData(object): | |
''' | |
Extract the exif data from any image. Data includes GPS coordinates, | |
Focal Length, Manufacture, and more. | |
''' | |
exif_data = None | |
image = None | |
def __init__(self, img_path): | |
self.image = Image.open(img_path) | |
#print(self.image._getexif()) | |
self.get_exif_data() | |
super(ImageMetaData, self).__init__() | |
def get_exif_data(self): | |
"""Returns a dictionary from the exif data of an PIL Image item. Also converts the GPS Tags""" | |
exif_data = {} | |
info = self.image._getexif() | |
if info: | |
for tag, value in info.items(): | |
decoded = TAGS.get(tag, tag) | |
if decoded == "GPSInfo": | |
gps_data = {} | |
for t in value: | |
sub_decoded = GPSTAGS.get(t, t) | |
gps_data[sub_decoded] = value[t] | |
exif_data[decoded] = gps_data | |
else: | |
exif_data[decoded] = value | |
self.exif_data = exif_data | |
return exif_data | |
def get_if_exist(self, data, key): | |
if key in data: | |
return data[key] | |
return None | |
def convert_to_degress(self, value): | |
"""Helper function to convert the GPS coordinates | |
stored in the EXIF to degress in float format""" | |
d0 = value[0][0] | |
d1 = value[0][1] | |
d = float(d0) / float(d1) | |
m0 = value[1][0] | |
m1 = value[1][1] | |
m = float(m0) / float(m1) | |
s0 = value[2][0] | |
s1 = value[2][1] | |
s = float(s0) / float(s1) | |
return d + (m / 60.0) + (s / 3600.0) | |
def get_lat_lng(self): | |
"""Returns the latitude and longitude, if available, from the provided exif_data (obtained through get_exif_data above)""" | |
lat = None | |
lng = None | |
exif_data = self.get_exif_data() | |
#print(exif_data) | |
if "GPSInfo" in exif_data: | |
gps_info = exif_data["GPSInfo"] | |
gps_latitude = self.get_if_exist(gps_info, "GPSLatitude") | |
gps_latitude_ref = self.get_if_exist(gps_info, 'GPSLatitudeRef') | |
gps_longitude = self.get_if_exist(gps_info, 'GPSLongitude') | |
gps_longitude_ref = self.get_if_exist(gps_info, 'GPSLongitudeRef') | |
if gps_latitude and gps_latitude_ref and gps_longitude and gps_longitude_ref: | |
lat = self.convert_to_degress(gps_latitude) | |
if gps_latitude_ref != "N": | |
lat = 0 - lat | |
lng = self.convert_to_degress(gps_longitude) | |
if gps_longitude_ref != "E": | |
lng = 0 - lng | |
return lat, lng |
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