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Geo Tagging images using iphone-exif (Part I) |
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The GeoTagging of photos can be really useful. Flickr and Picasa can both use Exif data embedded into an image to generate the Map locations displayed on the site. The only downside is that it is quite tricky to do this directly on the phone. There are a number of solutions to do this on the PC or by uploading to the site and then tag each image or image folder with a location, but it is another step when you really want to do it all at once. The solution up as a static C/Objective-C library that allows reading/editing and deleting standard Exif tags directly on images on your iPhone. This is a quick guide to getting it set up in your project. |
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Geo Tagging images on the iPhone using EXIF (PART II) |
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In the first part we briefly examined the iphone-exif library API. In this part we will address the wider API, covering the GPS tags and the use of custom handlers to read/write nonstandard data or deal with specific bespoke formats. The GPS location and associated data is stored in a number of tags that represent location, altitude, speed and destination among other things. The actual location data is generally represented as a pair of tags with the xxxRef tag representing a modifier for the corresponding value tag. For instance the GPSLongitudeRef and GPSLongitude tag together represent the longitude value. GPS Tags The GPS tags in the EXIF spec are represented as follows: |
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