GPS Tag Write not setting negative

[contd]

This maybe a dumb question given my limited knowledge of GPS data but when I try to set the Latitude and Longitude tags they get set to only positive numbers.

let file = "/path/to/photo.jpg";
let lattitude = 39.1132577;
let longitude = -84.6907715;
await exiftool.write(file, { GPSLatitude: lattitude });
await exiftool.write(file, { GPSLongitude: longitude });

When I open the file it shows the GPS as 39.1132577 latitude and 84.6907715 longitude (middle of the ocean). I feel like I a missing something and its pretty simple. Everything else I've used this for works great! Thanks!

[mceachen]

I've just pushed a test that verifies that all combinations of negative, zero, and positive values for GPS work properly on all platforms. See https://github.com/photostructure/exiftool-vendored.js/actions/runs/4154789945 and d9bfd9a (these tests pass on Windows using an older build, fwiw).

Note that you don't want to call write twice in your example, and I expect that's your issue. This is what your code should look like:

const GPSLatitude = 39.1132577;
const GPSLongitude = -84.6907715;
await exiftool.write(file, { GPSLatitude, GPSLongitude });

[mceachen]

Looks like this works correctly if I change ExifTool to v12.50, but fails on 12.55. It may be in my code or in ExifTool--I need to look into it more.

You can try it locally by editing this section of the package.json:

  "optionalDependencies": {
    "exiftool-vendored.exe": "12.50.0",
    "exiftool-vendored.pl": "12.50.0"
  }

I'll get this addressed in the next day or two. Thanks for the bug report!

[contd]

I tried your approach and got the same result. I also tried to to null them first then go back and set them and it still set the GPSLongitude to positive.

const GPSLatitude = 39.1132577;
const GPSLongitude = -84.6907715;
await exiftool.write(file, {GPSLatitude: null, GPSLongitude: null});
await exiftool.write(file, { GPSLatitude, GPSLongitude });

I changing the optionalDependencies like you mentioned and first got the same result. Then I realized I needed to npm install in the exiftool-vendored dir in node_modules before re-running and then boom it worked!!

Thanks for this and I'm happy to help any further.

[mceachen]

I looked at the recent git logs for exiftool and didn't see a smoking gun there. I posted a bug report to their forum--they're really responsive.

[mceachen]

According to the ExifTool Gurus, I need to specify the Ref explicitly to handle different filetypes. I've just made this change to the branch--if it passes on all platforms, I can ship the bugfix.

[mceachen]

Merged to main and released. Thanks again for the bug report!