2004.11.23 12:04 "[Tiff] GPS and EXIF", by Joris Van Damme

Guys,

I'm trying to find my way through the EXIF specs, trying to add the tags in a new 'Private IFD tags' section of the Tag directory (http://www.awaresystems.be/imaging/tiff/tifftags.html).

What remains unclear is the highest level of understanding on GPS. I see the specified tags, and I see they are clearly related to positioning and satellites and stuff. GPS is then probably the abreviation of 'General Positioning System', I assume. What remains unclear is what kind of application makes use of this. What application or devices write GPS IFDs in a TIFF? Why, what is the purpose? What is the relation to EXIF, that seems clearly to be all about digital camera still images, while GPS includes such stuff as the movement speed and direction? The nature of the GPS tags make me wonder whether there is any relation between GPS and GeoTIFF. Is there?

Joris Van Damme
info@awaresystems.be
http://www.awaresystems.be
Download your free TIFF tag viewer for windows here:
http://www.awaresystems.be/imaging/tiff/astifftagviewer.html