用python解释exif数据的GPS信息
我正在写一个小程序来获取iphone jpg照片的GPS信息。
我使用的库是python中的PIL。现在我可以得到GPSInfo了,它类似于:
{1: N,
2: ((1, 1), (20, 1), (5365, 100)),
3: E,
4: ((103, 1), (41, 1), (1052, 100)),
5: 0,
6: (43, 1),
7: ((15, 1), (32, 1), (7, 1)),
16: T,
17: (77473, 452),
29: 2013:10:25}
我怎么解释?我注意到标签是不连续的,所以是否有任何作弊表,我可以参考,以便更好地了解所有的数字标签和他们的意思?谢谢您!
更新
对不起,我想出来了。在PIL库中,有一个GPSTAGS.get()函数可以帮助我解码gps信息中的密钥。谢谢你们!
gpsinfo = {}
for key in exif[GPSInfo].keys():
decode = ExifTags.GPSTAGS.get(key,key)
gpsinfo[decode] = exif[GPSInfo][key]
print gpsinfo
结果是
{GPSTimeStamp: ((15, 1), (32, 1), (7, 1)),
GPSImgDirectionRef: T,
GPSImgDirection: (77473, 452),
GPSLongitude: ((103, 1), (41, 1), (1052, 100)),
GPSLatitudeRef: N, 29: 2013:10:25,
GPSAltitude: (43, 1),
GPSLatitude: ((1, 1), (20, 1), (5365, 100)),
GPSLongitudeRef: E,
GPSAltitudeRef: 0}
3条回答
网友
1楼 ·
OP,已经发布了一个使用PIL的解决方案。如果您只想从Python获取GPS信息,可以使用
使用pip安装包
$ pip install exifread
获取GPS数据
In [10]: import exifread
In [11]: tags = exifread.process_file(open(./tests/demo-project/content/test.jpg, rb))
In [12]: geo = {i:tags[i] for i in tags.keys() if i.startswith(GPS)}
In [13]: geo
Out[13]:
{GPS GPSAltitude: (0x0006) Ratio=186188/239 @ 898,
GPS GPSAltitudeRef: (0x0005) Byte=0 @ 722,
GPS GPSDate: (0x001D) ASCII=2015:12:06 @ 954,
GPS GPSDestBearing: (0x0018) Ratio=43771/526 @ 946,
GPS GPSDestBearingRef: (0x0017) ASCII=T @ 806,
GPS GPSImgDirection: (0x0011) Ratio=43771/526 @ 938,
GPS GPSImgDirectionRef: (0x0010) ASCII=T @ 782,
GPS GPSLatitude: (0x0002) Ratio=[46, 3803/100, 0] @ 850,
GPS GPSLatitudeRef: (0x0001) ASCII=N @ 674,
GPS GPSLongitude: (0x0004) Ratio=[13, 2429/100, 0] @ 874,
GPS GPSLongitudeRef: (0x0003) ASCII=E @ 698,
GPS GPSSpeed: (0x000D) Ratio=139/50 @ 930,
GPS GPSSpeedRef: (0x000C) ASCII=K @ 758,
GPS GPSTimeStamp: (0x0007) Ratio=[10, 37, 33] @ 906,
GPS Tag 0x001F: (0x001F) Ratio=30 @ 966}
网友
2楼 ·
使用exifread模块。
这里有一个非常有用的
import exifread as ef
# barrowed from
# https://gist.github.com/snakeye/fdc372dbf11370fe29eb
def _convert_to_degress(value):
"""
Helper function to convert the GPS coordinates stored in the EXIF to degress in float format
:param value:
:type value: exifread.utils.Ratio
:rtype: float
"""
d = float(value.values[0].num) / float(value.values[0].den)
m = float(value.values[1].num) / float(value.values[1].den)
s = float(value.values[2].num) / float(value.values[2].den)
return d + (m / 60.0) + (s / 3600.0)
def getGPS(filepath):
returns gps data if present other wise returns empty dictionary
with open(filepath, r) as f:
tags = ef.process_file(f)
latitude = tags.get(GPS GPSLatitude)
latitude_ref = tags.get(GPS GPSLatitudeRef)
longitude = tags.get(GPS GPSLongitude)
longitude_ref = tags.get(GPS GPSLongitudeRef)
if latitude:
lat_value = _convert_to_degress(latitude)
if latitude_ref.values != N:
lat_value = -lat_value
else:
return {}
if longitude:
lon_value = _convert_to_degress(longitude)
if longitude_ref.values != E:
lon_value = -lon_value
else:
return {}
return {latitude: lat_value, longitude: lon_value}
return {}
file_path = file path of the file
gps = getGPS(file_path)
print gps
网友
3楼 ·
迟回答,但截至2019年,您可以使用,即:
from GPSPhoto import gpsphoto # Get the data from image file and return a dictionary data = gpsphoto.getGPSData(IMG_20181224_201933.jpg) print(data[Latitude], data[Longitude])
输出:
安装:
pip install GPSPhoto
