I wrote an applescript that can either be set as the Automatic Task in the ImageCapture utility or you can drag files onto the script for processing. However, first you'll need to install Phil Harvey's exiftool:
http://www.sno.phy.queensu.ca/~phil/exiftool/
Then copy and paste the rest of this post into Script Editor, customise for your location and save as an application (eg. File Format: Application). I've #commented the code to help you find where to tweak the North/South/East/West variables.
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(* This script can either be set as the Automatic Task in the ImageCapture utility or you can drag files onto the script for processing.
FIRST: the script checks each file to see if it's been geotagged (otherwise screenshots and saved images that are in your camera roll end up getting tagged with the coordinates 0,0)
SECOND: it changes the reference data on any images that hold an unwanted compass point (eg. North) to the desired reference points (eg. South & East) *)
on open theFiles
repeat with aFile in theFiles
#this next bit searches for files that are inappropriately tagged GPSLatitudeRef = N (eg. North)
#however, depending on where you are, you may want to change it to search for files tagged West (eg. Ref = W)
do shell script "if (exiftool -v " & quoted form of POSIX path of aFile & " | grep \"GPSLatitudeRef = N\");
#Change the =S and =E to the desired compass refernces. (South & East are good for Oceania)
then exiftool -overwrite
original_inplace -gpslatituderef=S -gpslongituderef=E " & quoted form of POSIX path of aFile & "
fi"
end repeat
end open
(* As far as I know this works, however I take no responsibility for any loss/gain of data which results from the use of these 1's and 0's. Please share if you see anyway that this script could be improved. *)
