It is possible to add points manually as you shoot, but if you want hands-free operation and if fine temporal resolution is needed, continuous recording mode is the answer.įinally, GeoTagr generates a. Location data can be taken from GPS or derived from either Wi-Fi access points (good for urban areas) or cellphone towers. Next, GeoTagr will record location points at intervals you select, either continuously or at intervals of 3, 5 or 10 minutes. Component 1: Collecting GPS Coordinatesįor this part of the problem, I used an iPhone app called GeoTagr (formerly GeoLogTag), developed by Galarina and purchased through the iTunes App Store for $4.99, as opposed to a $350 Garmin.įirst, you precisely synchronize (to the second) GeoTagr’s clock with the clock on your camera. Whatever solution I came up with would require two components: a method for collecting GPS coordinates and a geotagging application for assigning lat-long to images and writing the data into each image’s EXIF file. I also wasn’t keen to spend similar coin on a Garmin hand-held to record flight tracks as I already had a GPS-enabled iPhone. There are camera attachments that will do this, too, but I’ve heard varying reports on how well they work and I wasn’t going to drop a few hundred bucks to find out. Newer, GIS-enabled digital cameras already have this functionality. Ideally, I wanted to write lat-long coordinates to the EXIF (Exchangeable Image File) data embedded in each image file, where text information such as date and time, shutter speed and exposure are already kept. Our photos provided situational awareness for the State Emergency Management Agency, the Missouri State Highway Patrol and other law enforcement agencies working the flood and the recovery operation.Īll of this quickly added up to thousands of image files and full memory chips on my Nikon D-80, with no record other than scribbled notes and my own middle-aged memory to document locations for each. On August 1, flood detail suddenly turned to a months-long search and recovery operation after Missouri State Trooper Fred Guthrie and his dog, Reed, went missing on a flood-scoured highway west of Mound City, Missouri. I was assigned to aerial photography as we watched for levee breaches along 140 miles of river from south of Atchison, Kansas to the Iowa state line. In June and July of 2011, the Missouri River reached levels last seen during the great flood of 1993. Editor's Note: See the many graphics accompanying this article at the bottom of the text portion.
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