GPS programing: I'm getting a callback every second or so with latitude and longitude. What's a good rule of thumb for calculating "current speed", and other derived values? -

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(I think this question is platform independent, but I have to be coding for the Nexus One).

About "current speed": I am getting every other callback or telling me how much my current latitude and longitude is, I can call the distance between the current location and the previous location I am, therefore, I can keep track of cumulative distance and cumulative. With this I can say what is the average speed for the entire journey, but how can I do the current pace? I suspect that I need to use recent N samples, right? Am I thinking about this right? What is a good rule of thumb for N? (How many samples, or how many seconds back?)

"Time to shut down": If I am still standing, then I can be a little different latitude and underline, okay? So, to decide that I'm not really saying anything like "x x locks are all within one meter of each other", right? Am I thinking about this right? What is a good rule of thumb for X and Y?

Even about "distance": am I not able to understand it because I am really cutting corners? Is there an algorithm, thumb rule for determining whether I am "turning" and adding it to some frustration?

EDIT: I feel bad about wasteing people time and well, but unfortunately, the device IS is pushing me I thought That was not because it was not in the emulator, but on the real device it is. Thanks to all. There are still some code-rules that I have to write, but speed was the biggest challenge.

EDIT: I apologize, in my original question I had written that the distance is also derived value. If I only use raw GPS data, then I will remove the distances due to mistakes. I can run on a straight line, but the use of raw GPS will continue for a long time, so if I distance between points By measuring the total distance, I will overstate it. Here are some links that are related to this problem.




about current speed Most GPS devices send you this information on their own


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