Yea, about that...
Solved :-)
private double gpsDistance(float current_lat, float current_lng,
float prev_lat, float prev_long) {
float K = (float) (180/3.14169);
float a = current_lat / K;
float b = current_lng / K;
float c = prev_lat / K;
float d = prev_long / K;
float ndsa =
FloatMath.cos(a)*FloatMath.cos(b)*FloatMath.cos(c)*FloatMath.cos(d);
float ndsb =
FloatMath.cos(a)*FloatMath.sin(b)*FloatMath.cos(c)*FloatMath.sin(d);
float ndsc = FloatMath.sin(a)*FloatMath.sin(c);
double myTempResult = Math.acos(ndsa + ndsb + ndsc);
return myTempResult*6366000;
}
On 4 September 2011 22:48, Christopher Van Kirk
<[email protected]> wrote:
> It just boggles the mind.
>
> Try floats or doubles.
>
> On 9/5/2011 5:27 AM, Fred Niggle wrote:
>>
>> Many thanks for your reply, but as this is not an iOS list........
>> I've been having trouble deciding on what type of variable should be
>> used when converting the formulea from javascript to android java, and
>> I could really use some pointers.
>>
>> On 4 September 2011 02:08, lbendlin<[email protected]> wrote:
>>>
>>> in iOS the manual function is faster than the built-in one, but on
>>> Android
>>> the difference is negligible. here's the Objective-C version
>>>
>>> //spherical distance in meters
>>> - (CGFloat) sphericalDistanceFromLat1:(CGFloat)lat1 Lon1:(CGFloat)lon1
>>> toLat2:(CGFloat)lat2 Lon2:(CGFloat)lon2 {
>>> return acos(sin(lat1 * 0.0174533) * sin(lat2 * 0.0174533) + cos(lat1
>>> *
>>> 0.0174533) * cos(lat2 * 0.0174533) * cos((lon2-lon1) * 0.0174533)) *
>>> 6371000;
>>> }
>>>
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