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java.lang.Object | +--com.bbn.openmap.tools.terrain.LOSGenerator
A Class that can do Line-Of-Sight calculations between two points. Uses the DTEDFrameCache to get elevations.
Field Summary | |
protected int |
INVISIBLE
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protected int |
MAYBEVISIBLE
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protected int |
VISIBLE
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Constructor Summary | |
LOSGenerator()
Not the preferred way to create one of these. |
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LOSGenerator(DTEDFrameCache cache)
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Method Summary | |
double |
calculateLOSSlope(int startTotalHeight,
int endTotalHeight,
float 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()
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boolean |
isLOS(LatLonPoint startLLP,
int startObjHeight,
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)
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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
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, 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.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 double calculateLOSSlope(int startTotalHeight, int endTotalHeight, float 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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