Thanks for the helpful pointer! I wanted to be able to write back to say it had all worked, but it didn't....I started trying to figure out why--which got me more confused, and slowed me down.
The short answer appears to be: When I run exiftool on the image file (.heic), it gives the correct location. When I run it on the .xmp file that Photos 5.0 produces, it already has appended an (incorrect) "E" to the gpslongitude tag. That's presumably what Lightroom is also reading.
More confusingly to me, when I look at the .xmp file in a text editor, it looks different to me from what exiftool shows, in terms of GPS location.
My challenge is that I want Lightroom to import the keywords that are embedded in the .xmp file; otherwise, I would just throw away the .xmp file. One possibility would be to figure out how to get exiftool to copy the keywords from the .xmp files directly into the .heic files. Or else, I still need to figure out how to correct what's in the .xmp files. Both of those are beyond my exiftool skills, so advice would be very much appreciated.
Two example files are here. In a text editor, the (entire) .xmp file produced by Photos 5.0 looks like this:
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 5.4.0">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about=""
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:exif="http://ns.adobe.com/exif/1.0/"
xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/">
<dc:subject>
<rdf:Seq>
<rdf:li>Rockefeller Redwoods</rdf:li>
<rdf:li>Favorites</rdf:li>
<rdf:li>Redwoods</rdf:li>
</rdf:Seq>
</dc:subject>
<exif:GPSSpeedRef>K</exif:GPSSpeedRef>
<exif:GPSSpeed>0.023617127910090144</exif:GPSSpeed>
<exif:GPSTimeStamp>2019-12-30T22:31:15Z</exif:GPSTimeStamp>
<exif:GPSImgDirection>174.43260959</exif:GPSImgDirection>
<exif:GPSLongitudeRef>W</exif:GPSLongitudeRef>
<exif:GPSAltitudeRef>0</exif:GPSAltitudeRef>
<exif:GPSLongitude>123.94116166999997</exif:GPSLongitude>
<exif:GPSLatitude>40.341178329999991</exif:GPSLatitude>
<exif:GPSLatitudeRef>N</exif:GPSLatitudeRef>
<exif:GPSImgDirectionRef>T</exif:GPSImgDirectionRef>
<exif:GPSAltitude>51.200000000000003</exif:GPSAltitude>
<exif:GPSHPositioningError>32.004833106781454</exif:GPSHPositioningError>
<photoshop:DateCreated>2019-12-30T14:31:15-08:00</photoshop:DateCreated>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>
Most notably, neither <exif:GPSLongitude> nor <exif:GPSLatitude> have a direction (N or E/W).
In exiftool, the key fields from exiftool *.xmp show (with incorrect East):
Subject : Favorites, Redwoods
GPS Longitude : 123 deg 56' 28.18" E
GPS Latitude : 40 deg 20' 28.24" N
GPS Latitude Ref : North
GPS Longitude Ref : East
In contrast, when I run exiftool *.heic, it shows (correctly)
GPS Latitude Ref : North
GPS Longitude Ref : West
GPS Latitude : 40 deg 20' 28.24" N
GPS Longitude : 123 deg 56' 28.18" W
So in short, the .heic file is fine. The .xmp file is not.
So if possible, how do I get exiftool to add the Subject/keyword fields to the .heic file? Or else, how do I correct the GPS coordinates in the .xmp files? (I have probably 20K of them in all.) I feel like it should be easy, but it's beyond me, so any help would be appreciated. (I can also post this in a exiftool forum if that's the preferred location).
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