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java.lang.Object com.bbn.openmap.tools.terrain.LOSGenerator
public class LOSGenerator
A Class that can do LineOfSight calculations between two points. Uses the DTEDFrameCache to get elevations.
Field Summary  

protected int 
INVISIBLE

static java.util.logging.Logger 
logger

protected int 
MAYBEVISIBLE

protected int 
VISIBLE

Constructor Summary  

LOSGenerator()
Not the preferred way to create one of these. 

LOSGenerator(DTEDFrameCache cache)

Method Summary  

static double 
calculateLOSSlope(int startTotalHeight,
int endTotalHeight,
double arc_dist)
Calculate the slope of a line between two points across a spherical model of the earth. 
double 
calculateLOSSlope(LatLonPoint startLLP,
int startTotalHeight,
LatLonPoint endLLP,
int endObjHeight)
CalculateLOSslope figures out the slope from one point to another. 
DTEDFrameCache 
getDtedCache()

boolean 
isLOS(LatLonPoint startLLP,
int startObjHeight,
boolean addStartElevation,
LatLonPoint endLLP,
int endObjHeight,
int numPoints)
Check to see if two points are within line of sight of each other, taking into account their elevations above Mean Sea Level as retrieved by a DTED database, and any other addition height of each object. 
void 
setDtedCache(DTEDFrameCache cache)

Methods inherited from class java.lang.Object 

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

protected int INVISIBLE
protected int VISIBLE
protected int MAYBEVISIBLE
public static java.util.logging.Logger logger
Constructor Detail 

public LOSGenerator()
public LOSGenerator(DTEDFrameCache cache)
Method Detail 

public void setDtedCache(DTEDFrameCache cache)
public DTEDFrameCache getDtedCache()
public boolean isLOS(LatLonPoint startLLP, int startObjHeight, boolean addStartElevation, LatLonPoint endLLP, int endObjHeight, int numPoints)
startLLP
 location of point 1.startObjHeight
 the elevation of point 1 above the surface, in
meters. The surface elevation of the point will be looked up and
added to this value.addStartElevation
 true if startObjHeight also needs DTED lookup
added to it.endLLP
 location of point 2.endObjHeight
 the elevation of point 2 above the surface, in
meters. The surface elevation of the point will be looked up and
added to this value.numPoints
 number of sample points to check between the two end
points. Can be dependent on the Projection of the current map, and
based on the number of pixels between the projected points. Could
also be based on the number of elevation posts between the two
points in the DTED database.
public double calculateLOSSlope(LatLonPoint startLLP, int startTotalHeight, LatLonPoint endLLP, int endObjHeight)
startLLP
 the coordinates of point 1.startTotalHeight
 the total height of point 1, from the Mean Sea
Level  so it's the elevation of the point plus altitude above the
surface, in meters.endLLP
 the coordinates of point 2.endObjHeight
 the elevation of point 2 above the surface, in
meters. The surface elevation of the point will be looked up and
added to this value.
public static double calculateLOSSlope(int startTotalHeight, int endTotalHeight, double arc_dist)
startTotalHeight
 total height of one point, in meters. Should
represent elevation of point which is the surface elevation above
MSL, and the height above the surface.endTotalHeight
 total height of one the other point, in meters.
Should represent elevation of point which is the surface elevation
above MSL, and the height above the surface.arc_dist
 the surface angle, in radians, across the spherical model
of the earth that separates the two points.


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