Hi,
I am trying to set keys:GPSCoordinates from the GPSPosition. I noticed that after setting this field, I can no longer update the default mapped -GPSLatitude=0.00 --GPSLongitude=0.00
First I set to 0/0, things are working.
exiftool '-GPSLatitude=0.00 -GPSLatitudeRef=0.00' '-GPSLongitude=0.00 -GPSLongitudeRef=0.00' test.MOV -verbose
1 image files updated
GPS Version ID : 2.3.0.0
GPS Latitude : 0 deg 0' 0.00" N
GPS Longitude : 0 deg 0' 0.00" E
GPS Latitude Ref : North
GPS Longitude Ref : East
GPS Position : 0 deg 0' 0.00" N, 0 deg 0' 0.00" E
Then I set to 5/3, things are working.
exiftool '-GPSLatitude=5.00 -GPSLatitudeRef=5.00' '-GPSLongitude=3.00 -GPSLongitudeRef=3.00' test.MOV -verbose
1 image files updated
GPS Version ID : 2.3.0.0
GPS Latitude : 5 deg 5' 0.00" N
GPS Longitude : 3 deg 3' 0.00" E
GPS Latitude Ref : North
GPS Longitude Ref : East
GPS Position : 5 deg 5' 0.00" N, 3 deg 3' 0.00" E
As a sanity check I repeat the previous two more times to make sure that things are working.
Now I set the key based on the GPSPosition
exiftool '-keys:GPSCoordinates<GPSPosition' test.MOV -verbose
1 image files updated
GPS Version ID : 2.3.0.0
GPS Coordinates : 5 deg 5' 0.00" N, 3 deg 3' 0.00" E
GPS Latitude : 5 deg 5' 0.00" N
GPS Longitude : 3 deg 3' 0.00" E
GPS Latitude Ref : North
GPS Longitude Ref : East
GPS Position : 5 deg 5' 0.00" N, 3 deg 3' 0.00" E
Great, it worked. However at this point, I can no longer updates GPS Latitude or Longitude.
Questions:
1 - is this because exiftool now has multiple GPS fields available and it doesn't know which to pick?
2 - if so, why is there no warning or error message - the indication is that the file was updated successfully.
exiftool '-GPSLatitude=0.00 -GPSLatitudeRef=0.00' '-GPSLongitude=0.00 -GPSLongitudeRef=0.00' test.MOV -verbose
1 image files updated
GPS Version ID : 2.3.0.0
GPS Coordinates : 5 deg 5' 0.00" N, 3 deg 3' 0.00" E
GPS Latitude : 5 deg 5' 0.00" N
GPS Longitude : 3 deg 3' 0.00" E
GPS Latitude Ref : North
GPS Longitude Ref : East
GPS Position : 5 deg 5' 0.00" N, 3 deg 3' 0.00" E
I get the impression that this is a newbie misunderstanding.
Using ExifTool 12.05 on Mac OSX 10.15.2, ZSH shell
Thank you,
- Borna
Hi Borna,
This is FAQ 3 (https://exiftool.org/faq.html#Q3)
- Phil
To break things down further
C:\>exiftool -P -overwrite_original -GPSLatitude=5.00 -GPSLatitudeRef=5.00 -GPSLongitude=3.00 -GPSLongitudeRef=3.00 Y:\!temp\Test1.mp4
1 image files updated
C:\>exiftool -g1 -a -s -gps* Y:\!temp\Test1.mp4
---- XMP-exif ----
GPSLatitude : 5 deg 0' 0.00" N
GPSLongitude : 3 deg 0' 0.00" E
---- Composite ----
GPSLatitudeRef : North
GPSLongitudeRef : East
GPSPosition : 5 deg 0' 0.00" N, 3 deg 0' 0.00" E
Here you can see that you set the XMP:GPSLatitude/XMP:GPSLongitude. The XMP GPS tags are meant to include the reference direction, as there are not XMP GPS reference tags. As you can see, setting GPSLatitudeRef/GPSLongitudeRef in your original command did nothing. The composite reference tags are derived from the XMP tags. You can verify this by setting the main tags to a hemisphere opposite of the reference tags. For example
C:\>exiftool -P -overwrite_original -GPSLatitude=-5.00 -GPSLatitudeRef=N -GPSLongitude=-5.00 -GPSLongitudeRef=E Y:\!temp\Test1.mp4
1 image files updated
C:\>exiftool -g1 -a -s -gps* Y:\!temp\Test1.mp4
---- XMP-exif ----
GPSLatitude : 5 deg 0' 0.00" S
GPSLongitude : 5 deg 0' 0.00" W
---- Composite ----
GPSLatitudeRef : South
GPSLongitudeRef : West
GPSPosition : 5 deg 0' 0.00" S, 5 deg 0' 0.00" W
Even though I set the references to North and East, the output shows South and West.
Now going back to your original command and then setting the Quicktime tag
C:\>exiftool -P -overwrite_original -GPSLatitude=5.00 -GPSLongitude=3.00 Y:\!temp\Test1.mp4
1 image files updated
C:\>exiftool -P -overwrite_original "-keys:GPSCoordinates<GPSPosition" Y:\!temp\Test1.mp4
1 image files updated
C:\>exiftool -g1 -a -s -gps* Y:\!temp\Test1.mp4
---- Keys ----
GPSCoordinates : 5 deg 0' 0.00" N, 3 deg 0' 0.00" E
---- XMP-exif ----
GPSLatitude[tt]GPSLatitude[/tt]/[tt]GPSLongitude[/tt] : 5 deg 0' 0.00" N
GPSLongitude : 3 deg 0' 0.00" E
---- Composite ----
GPSLatitude : 5 deg 0' 0.00" N
GPSLongitude : 3 deg 0' 0.00" E
GPSLatitudeRef : North
GPSLongitudeRef : East
GPSPosition : 5 deg 0' 0.00" N, 3 deg 0' 0.00" E
Next, when you re-write the GPSLatitude/GPSLongitude and display the output
C:\>exiftool -P -overwrite_original -GPSLatitude=0.00 -GPSLatitudeRef=0.00 -GPSLongitude=0.00 -GPSLongitudeRef=0.00 Y:\!temp\Test1.mp4
1 image files updated
C:\>exiftool -g1 -a -s -gps* Y:\!temp\Test1.mp4
---- Keys ----
GPSCoordinates : 5 deg 0' 0.00" N, 3 deg 0' 0.00" E
---- XMP-exif ----
GPSLatitude : 0 deg 0' 0.00" N
GPSLongitude : 0 deg 0' 0.00" E
---- Composite ----
GPSLatitude : 5 deg 0' 0.00" N
GPSLongitude : 3 deg 0' 0.00" E
GPSLatitudeRef : North
GPSLongitudeRef : East
GPSPosition : 5 deg 0' 0.00" N, 3 deg 0' 0.00" E
You can see that you did change the GPSLatitude/GPSLongitude, but the composite tags are derived from the GPSCoordinates tag instead of the XMP tags.
StarGeek is always showing me up with his detailed answers. ;)
Because I have fun trying to explain the details, hopefully in an (semi-)easy to understand way and not in a patronizing way.
Patronizing answers are required in society to get people to help themselves :D
Non patronizing ones are also required to help people get going.
I appreciate both!
I was doing something like this:
exiftool test.MOV | grep GPS
Which was printing GPSLatitude the composit tag ... okay, I think I'm starting to get the hang of this tool.
Thanks,
- Borna
Take a look at my examples to see how to use a wildcard to skip the extra step of using grep.