I have updated a few hundred photos with various metadata changes and decided I was finished and was doing write-backs (I typically do them in batches). These files hadn't had a write-back for many months (or even a year or two). The changes were not geo-related (GPS / Map / Location tags).
When I do the Write-Back, after reading the Metadata back into iMatch, the Pending Write-Back pen is back on for 80-100% of the files. It is showing that the following tags from the XMP::exif group need to be updated:
GPSDestDistance
GPSDestDistanceRef
GPSImgDirection
GPSImgDirectionRef
(Note that some only had the first 3 tags to write back and not the 4th - I could not see a pattern of why).
After I completed another Write-back for these, a handful are needing a third write-back because of:
GPSImgDirection
Perhaps I missed something in the release notes, is this related to a recent update to Exiftool or iMatch?
Should I expect this to be a one-time event for each file as they get written-back in order to correct/synchronize some data?
Or should I start double-checking my write-backs to repeat the process to get to a "No Pending Update" state?
Michael
Maybe related to release note #02391 and #02317?
You can use the search function on the release notes page to find them (enable search all products).
Yes, that was it.
Looks like there had been some rounding of GPS at some point as exiftool comes back with a very small fractional distance between the GPS and GPSDestination tags so then it updates the distance, direction, etc.
Thanks for the recall on which release note it was.
Michael
I checked and practically of my files have a difference between the GPS co-ordinates and the GPS Destination co-ordinates of 0.000001 or less. In my case I do sometimes use Destination co-ordinates purposefully but probably less than 1 in a 100 (and much more than a few metres of difference).
Looks like I need to apply a metadata template to align them to be the same so this issue will be dealt with and won't resurface constantly whenever I touch an older photo.
I note that in my iMatch Locations the Lat/Long co-ordinates have 6 decimal places - is that the amount of precision iMatch uses in general and/or is recommended?
Michael
IMatch does not set these coordinates. They are delivered by ExifTool. Unless you change them in IMatch (Map Panel, MD Panel).