4 ms·
This is a nifty tool, but it doesn't offer statistically independent samples. For many people, they don't care, but calculating from just a single track is rea
by olympus 12y ago
This is a nifty tool, but it doesn't offer statistically independent samples. For many people, they don't care, but calculating from just a single track is really a measurement of how much your track "drifts" as satellite move across the sky, and not so much your location error.
A better (but still not perfect) way to do this is to take measurements at several known location benchmarks, and then repeat this over a few days. Your local city government probably has a listing of known benchmarks, in Las Vegas the website is: http://www.lasvegasnevada.gov/Find/survey_benchmark.htm http://www.lasvegasnevada.gov/Find/survey_benchmark.htm
Doing this over the course of several days is important because you get data from several different GPS satellites from several different positions in the sky. This is much more labor intensive, but you will get a much better spec of how much you can trust your GPS.
- danpat 12y agoI do this with some vehicle tracking equipment I run at ski resorts. They run the machines over the snow on a daily basis. After a week or so of passes over the same trail, you get a much better idea of where the average line is. The data my clients typically initially supply me with is usually taken with a single pass using a Garmin unit strapped to the handlebars of an ATV. They often wonder why it differs so much from the results they're getting from the vehicle tracking equipment.