Exif To GeoJSON

This takes a directory full of images and makes a GeoJSON file with all of the found GPS points.

1. Put the images you want to create a corresponding GeoJSON file with in the img directory.
2. node exif-to-geojson.js
3. The output will be written to exif.geojson

Demo: http://hallahan.github.io/exif-to-geojson

After you run the script, you can see the geojson with pop-ups that link to the corresponding images in index.html.

Notes

1. The decoder does not seem to correctly decode the MakerNote and UserComment fields in the exif object, so I just delete them so that we do not have a bunch of un-decoded bytes wasting space in the JSON.

2. The GPSTimeStamp array is important, because this is the time stamp of the moment the phone got the actual GPS coordinate that is associated with the image. This is often not the same point in time that the picture itself was taken. This is particularly true with my phone which does not have a very reliable GPS unit.

3. The test directory is not unit tests, however, it does create json that you can look at to see if you find reasonable results. This should be refactored to produce unit tests.

4. The demo should be improved so that we can see multiple images where the GPS coordinates are at the same point. This is particularly a problem with images from my phone, because the GPS unit fails often and will tag many images with the same coordinates.