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? -

-

(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


Comments

Post a Comment

Popular posts from this blog

php - multilevel menu with multilevel array -

-
Just ask someone to solve this problem? I want to create a multilevel menu I can not find the right solution generated with multilevel array, it always gets an array_push error My study came from the original idea But still my Can not match the need. This is my MySQL [code] ----- --------------------- --------------- | ID | PARENT_ID | Name | Link | Seq | 1 | 0 | Dashboad | Dashboard / | 1 | 2 | 0 | Menu 1 | Menu 1 / | 2 | 3 | 0 | Menu 2 | Menu 2 / | 3 | 4 | 0 | Menu 3 | Menu 3 / | 4 | 5 | 2 | Joint Add / | 1 | 6 | 3 | Joint Add / | 1 | 7 | 2 | Edit | Edit / | 2 | 8 | 4 | Joint Add / | 1 ------------------------------------------ [/ Code] I want to do something like this in my array array ('dashboard' = & gt; array ('id' = & gt; '' 'Dame' = & gt; 'Dashboard', 'Title' = & gt; 'Dashboard', 'MatchMin' = & gt; Base_URL (). 'Dashboard /', 'Active' => = & Gt; NULL), ...
Read more

c# - TypeConverter in propertygrid only converts from string, not to -

-
When the property grid is reached, only the conversion mechanism (often called) is called "Foo!" Returns the property string in the grid when I click to edit I get an exception Type.oo. Object type can not be changed to type. (Not properly translated,) What is a clue from the convert format, why not? And the error indicates that it is trying to convert to a string, not from. I think that when I want to edit this object, it will have to be converted from foo to string, and when the editing ends. Public class FooTypeConverter: StringConverter {public override object ConvertFrom (ITypeDescriptorContext Reference, CultureInfo Culture, Object Value) {New Foo (string) value); } Convert the public override object (Type the ITE DiskText Contact Reference, CultureInfo Culture, Object Value, Type Type) {Return "Foo!"; } Public override bool CanConvertFrom (ITypeDescriptorContext reference, type source type) {back true; } Public Override Bull CanConvertTo (ITypeDescrip...
Read more

jQuery UI: Datepicker month format -

-
I am trying to change the format of the month that shows in the popup (not in the date that the picker actually I do not have any choice anywhere to do this, do I like to use a sub-string () or something else? What I normally display is Trying to change: Class = "ui-datepicker-title"> January & lt; / span & gt; ... & lt; / div & gt; Div>
Read more