Create a farmOS Observation log with Timestamp and Geometry from a JPEG image.

farmos_image_gps_observation.py

import base64
from datetime import datetime

from farmOS import farmOS
from PIL import Image
from PIL.ExifTags import TAGS, GPSTAGS

hostname = "http://localhost"
username = "username"
password = "password"

image_filepath = "test_img.jpg"

# GPSInfo code derived from:
# https://www.sylvaindurand.org/gps-data-from-photos-with-python/
def get_exif(filename):
    exif = Image.open(filename).getexif()

    if exif is not None:
        for key, value in exif.items():
            name = TAGS.get(key, key)
            data = exif.pop(key)
            exif[name] = data

        if 'GPSInfo' in exif:
            for key in exif['GPSInfo'].keys():
                name = GPSTAGS.get(key,key)
                exif['GPSInfo'][name] = exif['GPSInfo'].pop(key)

    return exif

def get_decimal_coordinates(info):
    for key in ['Latitude', 'Longitude']:
        if 'GPS'+key in info and 'GPS'+key+'Ref' in info:
            e = info['GPS'+key]
            ref = info['GPS'+key+'Ref']
            info[key] = ( e[0][0]/e[0][1] +
                          e[1][0]/e[1][1] / 60 +
                          e[2][0]/e[2][1] / 3600
                        ) * (-1 if ref in ['S','W'] else 1)

    if 'Latitude' in info and 'Longitude' in info:
        return [info['Longitude'], info['Latitude']]

exif = get_exif(image_filepath)

log = {
    "name": "My Photo Observation",
    "type": "farm_observation",
    "done": 1,
}

# Read GPSInfo from image data.
if exif is not None and 'GPSInfo' in exif:
    latlong = get_decimal_coordinates(exif['GPSInfo'])
    if latlong is not None:
        log['geofield'] = [
            {
                "geom": f"POINT ({latlong[0]} {latlong[1]})",
            },
        ]

# Read timestamp from image.
if exif is not None and 'DateTime' in exif:
    image_date = datetime.strptime(exif['DateTime'], '%Y:%m:%d %H:%M:%S')
    log['timestamp'] = image_date.timestamp()

# Image binary.
with open(image_filepath, "rb") as imageFile:
    image_binary = base64.b64encode(imageFile.read())

    log['images'] = [
        f"data:image/jpeg;base64,{image_binary.decode('utf-8')}"
    ]

farm = farmOS(hostname=hostname, username=username, password=password)
farm.authenticate()

res = farm.log.send(payload=log)
print(res)

Oh sorry mmh: pip install pillow !

Ah yes. Sorry, I didn't really take any time to document this. Glad that worked!

(what do the "f" in lines 59 and 73 mean?)

In Python you can use f"my string {my_variable} the rest of my string" to easily format variables inside. The alternative would be "my string " + my_variable + " the rest of my string."

Now the script end without error....but with "None"
also if I try "python farmos_image_gps_observation.py" in the script directory with the file image inside.

Hmm I'm not sure what you mean. The last line of my script is print(res) - that should print the response from the POST to the farmOS server. Perhaps that is failing? That might explain "None".