wonderly.jeaprs.aprs.data
Class Distance

java.lang.Object
  |
  +--wonderly.jeaprs.aprs.data.Distance

public class Distance

extends java.lang.Object

This class provides geographical distance calculations using integer math with static tables. This eliminates the use of floating point, but with a loss of some precision.

Version:

1.0

Author:

Gregg Wonderly - The information contained in this document is Copyright 2001-2003, Gregg Wonderly, all rights reserved.

Field Summary

static long	kiloPerDegree
static long	onePointOneSix

Constructor Summary

Distance()

Method Summary

static long

stationDistanceMiles(long lt1, long lg1, long lt2, long lg2) Fixed point calculation of distance between two points.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

onePointOneSix

public static final long onePointOneSix

kiloPerDegree

public static final long kiloPerDegree

Constructor Detail

Distance

public Distance()

Method Detail

stationDistanceMiles

public static long stationDistanceMiles(long lt1,
                                        long lg1,
                                        long lt2,
                                        long lg2)

Fixed point calculation of distance between two points. Error is about 1.5 miles at 15 miles distance due to rounding.