We have GST_TAG_LOCATION, which according to the docs that is:
"original location of file as a URI (string)"

First we should probably fix plugins that are not using it as such or redefine it.

/home/ensonic/projects/gstreamer/gst-plugins-base/gst-libs/gst/tag/gstvorbistag.c
LOCATION : Location where track was recorded

/home/ensonic/projects/gstreamer/gst-plugins-base/tests/check/libs/tag.c
ASSERT_TAG_LIST_HAS_STRING (list, GST_TAG_LOCATION, "Bristol, UK");


I'd like to support location information from EXIF and MP4/3GP tags:

In MP4/3GP we have 'loci' udta atom which among other things defines
Name		String	Text of place name
Longitude	Unsigned int(32)	Fixed-point value of the longitude
Latitude	Unsigned int(32)	Fixed-point value of the latitude
Altitude	Unsigned int(32)	Fixed-point value of the altitude
AstronomicalBody	String	Text of astronomical body

we could map name to GST_TAG_LOCATION and define
GST_TAG_LOCATION_{LONGITUDE,LATITUDE,ALTITUDE} for the GSP location.

I think we can live for a while without AstronomicalBody.

EXIF has a lot more
http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/GPS.html