Format of GPSVersionID

[Archive]

[Originally posted by msbc on 2010-01-14 22:15:34.280748-08]

Phil,

Could you clarify the format for writing the GPSVersionID tag.

I've read many posts elsewhere and there seem to be many variations on what people think is the correct format, here are some of them:

0.0.2.2

2,2,0,0

2 2 0 0

Mark

[Archive]

[Originally posted by exiftool on 2010-01-15 04:47:03.191447-08]

Hi Mark,

Yes, looking at my sample images I can see there is some
confusion about this, although I don't know why because
both the EXIF and XMP specifications are quite clear.
The correct format is "2.2.0.0".  In XMP this
is stored as a simple text string, while in EXIF exiftool
handles translation of this to the 4-byte value.  ExifTool
does no translation when writing XMP:GPSVersionID, so
the string must be in the correct format to begin with.
When writing EXIF:GPSVersionID exiftool also accepts
spaces instead of decimal points between the numbers.

- Phil

[Archive]

[Originally posted by exiftool on 2010-01-15 04:52:17.585245-08]

I should point out that since this tag is mandatory by EXIF specification,
exiftool writes this tag automatically when a new GPS IFD is created.
So if you are using ExifTool you shouldn't need to write this tag yourself.

- Phil

[Archive]

[Originally posted by msbc on 2010-01-15 21:25:36.042776-08]

Phil,

I use PhotoMechanic to Geotag my RAW images, which does set the GPSVersionID. I have some TIF's and JPG's that seem to have the GPS coords but are missing the VersionID so I'm fixing these images.

I'm writing a shell script (bash, OSX) to test all my images for the correct value but am noticing some inconsistencies if the tag is not present. The exiftool command i'm using is:

Code:

exiftool -filename -if 'not $gpsversionid eq "2.2.0.0"' DIR

If a file has a GPSVersionID tag which is not equal to 2.2.0.0 then this command works. If the file has no GPSVersionID tag at all then it fails - if I add -v2 I see the message:

Condition: Use of uninitialized value $info{"gpsversionid"} in string eq - ./IMG_0256.jpg

for each image.

Can you suggest a test that will work for the wrong value and also for images that don't have the tag at all?

Mark

[Archive]

[Originally posted by exiftool on 2010-01-16 04:15:41.08939-08]

Hi Mark,

This should do it for you:

Code:

-if 'not $gpsversionid or $gpsversionid ne "2.2.0.0"'

- Phil