Dominik Schmidt created TIKA-4781:
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Summary: Map EXIF GPS altitude to the existing geo:alt property
Key: TIKA-4781
URL: https://issues.apache.org/jira/browse/TIKA-4781
Project: Tika
Issue Type: Improvement
Reporter: Dominik Schmidt
ImageMetadataExtractor's GeotagHandler maps latitude, longitude and the
GPS timestamp from the EXIF GpsDirectory, but not the altitude, although
tika-core defines Geographic.ALTITUDE ("geo:alt") and metadata-extractor
exposes the value in the same directory (TAG_ALTITUDE / TAG_ALTITUDE_REF).
Consumers currently only get the raw string ("GPS:GPS Altitude" = "227.4
metres").
The altitude should be set as a signed value honoring the altitude ref
(below sea level = negative), analogous to TIKA-4425, which added the
normalized GPS timestamp from the same GpsDirectory. See also TIKA-2861
for the corresponding ISO 6709 altitude handling in MP4/QuickTime.
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