use EXIF tags in photos to rough-place them on import

[jywarren]

Some Android/iPhone photo apps store GPS, compass, and tilt data in EXIF.

From email:

Knitter already reads EXIF data and it would not be too big a project to have it read that to make a "rough guess" of the image's location. I'd love to try it with an iPhone or Android phone. One potential issue is that those devices use slower CMOS sensors which can cause "smearing" like this: http://drknife.com/photo/tag/smear/

Perhaps an app could be found or created which only takes photos if there is not motion or acceleration, so they'd all come out roughly down-facing and clear?

[jywarren]

Looks like iPhone 4 stores compass heading: http://stackoverflow.com/questions/3930266/what-information-is-stored-in-efix-jpeg-photos-taken-on-the-iphone-with-geotaggi

the EXIF tag is called "GPS Position"

The accelerometer "deltas" seem also to be stored:

http://isc.sans.org/diaryimages/exif.txt

    AccelerometerDeltas = "(0.0036 0.0061 0.0133) @ 0.0200";

source: http://isc.sans.edu/diary.html?storyid=8203

[jywarren]

Moving to https://github.com/publiclab/mapknitter/issues/67