Bulk editing GPS altitude

[Richi]

Hi,

I am attempting to extract GPS coordinates and altitudes from a batch of images, running them through an ellipsoidal to orthographic height converter, then changing out the altitude values for each image but retaining all other metadata fields.

So far I have been able to extract a csv of the fields I need using:

exiftool -filename -gpslatitude -gpslongitude -gpsaltitude -csv -T -r -n c:\Users\Name > output.csv

I have modified the altitude fields but am struggling to find a way to now use the csv to edit the GPSaltitude field in the original images.

Any suggestions would be much appreciated, thanks.

[Phil Harvey]

If you have a CVS file with just SourceFile and GPSAltitude columns, then you can use this command to write the GPSAltitude to all files:

exiftool -csv=CSVFILENAME.csv DIR

But you should also be setting GPSAltitudeRef (presumably to "Above Sea Level").

- Phil

[StarGeek]

But you should also be setting GPSAltitudeRef (presumably to "Above Sea Level").

This would also apply to GPSLatitude/GPSLongitude if you edit them, as the reference direction (N/S/E/W) are held in the separate GPSLatitudeRef/GPSLongitudeRef tags.