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3

I would say it's more of a math thing. GPS uses trilateration to calculate location. You need four satellites to get a proper position and my guess is that GPS units don't show anything until the minimum requirements have been met. So, that's an all or none affair, rather than piecemeal like you are suggesting. I think that's especially true since one of ...


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From a cold start to obtain a lock to satellites, GPS needs to download coarse orbit information about all satellites (almanac). At the rate GPS navigational signal is transmitted, it will take 12.5 minutes to download the entire almanac. There are some improvements that can reduce this time, e.g. based on location obtained through cell phones, among other ...


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I'm surprised nobody mentioned CEP - Circular error probable. Actually the accuracy in meters provided by your GPS means that it's accurate within X meters from actual position 50% of the time! https://en.wikipedia.org/wiki/Circular_error_probable http://blog.oplopanax.ca/2012/11/your-gps-is-lying/


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If you have the data in Excel you'd probably do better doing the calculation in Excel! The Haversine formula (find it here: http://www.movable-type.co.uk/scripts/latlong.html) will give you the distance between two pairs of latitude and longitude.


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Another option is CommCare. CommCare is designed to give organizations the flexibility of building mobile apps tailored to their programs. This can include data collection, client registration and tracking, behavior change counseling, and much more. CommCare supports complex workflows, longitudinal client tracking, multimedia optimization for low-literate ...


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GNSS without a differential correction (real-time or post-processed) of some sort, will not yield 1cm accuracy. If you do not have a reference station you are receiving RTK corrections from, you could post-process if you have the necessary office software or a service like OPUS. This would also obviously take two receivers at minimum (the base could be a ...


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You may click on some automatic tie point (the one you want to assign the elevation to), and then click: After clicking the correct position on more than 2 images, the coordinates will be displayed in the up-right. Change the point type from "manual tie points" to "3D GCP" and then change the elevation value. Repeat this for 3 points, well-distributed on ...


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I'd recommend to interpolate points on the finish line for all tracks/cars. I'd use a simple linear interpolation, knowing this will also introduce more errors, depending on the track geometry around the finish line. See this example: =========+====== > A + B > =========+====== > Cars travel left to right. There are 8 segments ...


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General rules would be (1) chose a base station that is as close as possible, and (2) whatever you do, make sure you use a receiver and a base station that both do GPS and GLONASS! With GPS + GLONASS, you have a MUCH better chance of having enough satellites shared between rover and base station. I have no experience on aquatic locations, but using a ...



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