I assume you are located in California. because the algorithm works for you sometimes. This note may explain why.
"0.00001 of a degree of latitude is 0.006 of a nautical mile, or 3 feet, 7+3/4 inches." Oh, about 1.1 meters. Your ring fence is 0.00008 deg lat by 0.00026 long. That is approximately 9 meters by about a little less than 28 meters (0.00001 of longitude at your longitude is a bit less than a meter I believe (the separation between longitude lines decreases pole-ward and the separation represented by 0.00001 longitude varies continuously) . Did I do that right?
Ask yourself, how accurate is your GPS reading? When you read the LocationSensor tutorial
you learned of a GPS receiver property called Accuracy. Accuracy varies depending on whether your device is in indoors, it is raining, how many satellites the gps can get a fix on etc. Typically, Accuracy is less than about four or five meters for most phones. If Accuracy is 5 meters and you are exactly in the center of your latitude boundaries, you may actually only be reported within your ring fence 68% of the time (a simplification, but the point I am making). The ability of the GPS to accurately resolve a location is in a constant state of flux. The GPS receiver in most phones is not precisely accurate. The positional information it provides may be only +/- 50 meters on average, perhaps as good as +/-5 meters on occasion. " and sometimes within a few meters.
The Android Developer Reference defines accuracy as “the radius of 68% confidence." If you draw a circle centered at this location's latitude and longitude, and with a radius equal to the accuracy, then there is a 68% probability that the true location is inside the circle. In statistical terms, it is assumed that location errors are random with a normal distribution, so the 68% confidence circle represents one standard deviation. In practice, location errors do not always follow such a simple distribution.
Your device may only tell you are within the boundaries or your existing ring fence (in the N/S dimensions) 68 percent of the time ; even though your device is physically within in the boundary. Thirty-two percent of the time, the GPS will report coordinates that are outside of the ring fence, even though the device is within it.
You ring fence is too tight in the N/S dimensions for precise measurement. A 7 1/2 minute USGS Quadrangle map would locate you more accurately. :) (The USGS has an office in Menlo Park)
A plot of GPS readings shown on a map using a fairly good GPS receiver/device resting on a desk inside a frame house shows where the Android 'thinks' it is as Accuracy varies.
You asked " Is there some way to allow it to register anyway if we are 5-10 meters away from that point just to get it to work as well. Yes, increase the size of your ring fence by perhaps 0.00010 perhaps for your latitude (provided accuracy reported for your device's GPS is consistently 5 meters; more if accuracy is say 50 meters) .... Adjust the boundaries until you get the results you want..if you are using your GPS indoors...well, it could be hopeless, especially if the building has few windows and steel construction.
You have another tool that can help you determine proximity to a specific location. The LocationSensor1.DistanceInterval property described in the location tutorial can be used.
read the posts by Christophe ... https://groups.google.com/forum/#!searchin/mitappinventortest/christophe
He built an app called Halte Alarm that tracks bus stop proximity. ... It is an AI2 app that uses the DistanceInterval property. This technique is not slam/dunk either.
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