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。现在我可以获得GPSInfo，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'}
我怎么解释这个？我注意到标签不是连续的，所以我可以参考哪些作弊表，以便更好地理解所有数字标签及其含义？谢谢！
更新
对不起，我已经弄明白了。在PIL lib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
这是结果
{'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}
答案 0 :(得分：12)
使用exifread模块。
这是一个非常有用的gist
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
答案 1 :(得分：6)
最新答案，但是从 2019 开始，您可以使用GPSPhoto，即：
render(){
let users = this.props.chatkit.roomUsers
let userIds = users.map((user) => {
return user.id
})
let roomMessages = this.props.messages
let messages = []
for(var i = 0; i < roomMessages.length; i++){
//create a new field to give each message a unique id
roomMessages[i].unique = roomMessages[i].senderId
//create a new field to give each message the avatar from that user
let matchingUserIndex = userIds.indexOf(roomMessages[i].senderId)
if(matchingUserIndex >= 0){
roomMessages[i].avatar = users[matchingUserIndex].avatar
}
//review messages
let previous = {}
if(i > 0){
previous = roomMessages[i - 1]
}
let currentMessage = roomMessages[i]
//check if consecutive messages are made by the same user
if(currentMessage.senderId === previous.senderId && currentMessage.unique === previous.unique){
//display user name and avatar as an empty string
messages.push({...currentMessage, unique: "", avatar: ""})
} else{
//display the user name
messages.push({...currentMessage})
}
}
//transform the unique field to contain the name of the user
let updatedMessages = []
for(var j = 0; j < messages.length; j++){
let matchingIdIndex = userIds.indexOf(messages[j].unique)
if(matchingIdIndex >= 0 && messages[j].unique !== ""){
messages[j].unique = users[matchingIdIndex].name
updatedMessages.push(messages[j])
} else {
updatedMessages.push(messages[j])
}
}
let currentChatkitUser = this.props.chatkit.chatUser.id
return(
<div>
{this.props.room && (
<div
style={{overflow: "scroll", overflowX: "hidden", maxHeight: "70vh"}}
ref={this.messageList}
>
<ul style={{listStyle: "none"}} className="p-4 mb-0">
{updatedMessages.map((message, index) => {
return (
<li
className="mb-1"
key={index}>
<div>
{message.unique && (
<span
className="d-block font-weight-bold mt-3"
style={{color: "#000323"}}
>
<img
src={message.avatar}
style={{width: "2.5rem"}}
className="rounded-circle mr-2"
/>
{message.unique}
</span>
)}
<span
className={message.senderId === currentChatkitUser ?
"muted-blue text-light rounded d-inline-block ml-5" : "bg-secondary text-light rounded d-inline-block ml-5"
}
style={{padding:".25rem .5rem"}}
>
{message.text}
</span>
</div>
</li>
)
})}
</ul>
<TypingIndicator usersWhoAreTyping={this.props.usersWhoAreTyping}/>
<div
style={{float: "left", clear: "both"}}
ref={this.messagesEnd}>
</div>
</div>
)}
</div>
)
}
输出：
38.71615498471598 -9.148730635643007
安装：
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'])
答案 2 :(得分：5)
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}