edu.wisc.ssec.mcidas
Class PSnav

java.lang.Object
  edu.wisc.ssec.mcidas.AREAnav
      edu.wisc.ssec.mcidas.PSnav

All Implemented Interfaces:

Serializable

public final class PSnav
extends AREAnav

Navigation class for Polar Stereographic (PS) type nav. This code was modified from the original FORTRAN code (nvxps.dlm) on the McIDAS system. It only supports latitude/longitude to line/element transformations (LL) and vice/versa. Transform to 'XYZ' not implemented.

Author:

Don Murray

See Also:

McIDAS Programmer's Manual, Serialized Form

Field Summary

Fields inherited from class edu.wisc.ssec.mcidas.AREAnav

ABIS, DEGREES_TO_RADIANS, DMSP, GEOS, GMSX, GOES, GVAR, indexEle, indexLat, indexLine, indexLon, KALP, LALO, LAMB, LL, MERC, MOLL, MSAT, MSG, MSGT, POES, PS, RADIANS_TO_DEGREES, RADR, RECT, SIN, TANC, XY

Constructor Summary

PSnav(int[] iparms)
Set up for the real math work.

Method Summary

double[][]	toLatLon(double[][] linele) converts from satellite coordinates to latitude/longitude
double[][]	toLinEle(double[][] latlon) toLinEle converts lat/long to satellite line/element

Methods inherited from class edu.wisc.ssec.mcidas.AREAnav

areaCoordToImageCoord, areaCoordToImageCoord, areaCoordToImageCoord, areaCoordToImageCoord, canApproximateWithSpline, doubleToFloat, equals, floatToDouble, getLineOffset, getSubpoint, imageCoordToAreaCoord, imageCoordToAreaCoord, imageCoordToAreaCoord, imageCoordToAreaCoord, isFlippedLineCoordinates, makeAreaNav, makeAreaNav, setFlipLineCoordinates, setImageStart, setMag, setMag, setRes, setRes, setStart, toLatLon, toLinEle, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

PSnav

public PSnav(int[] iparms)
      throws IllegalArgumentException

Set up for the real math work. Must pass in the int array of the PS nav 'codicil'.

Parameters:

iparms - the nav block from the image file

Throws:

IllegalArgumentException - if the nav block is not a RECT type.

Method Detail

toLatLon

public double[][] toLatLon(double[][] linele)

converts from satellite coordinates to latitude/longitude

Specified by:

toLatLon in class AREAnav

Parameters:

linele - array of line/element pairs. Where linele[indexLine][] is a 'line' and linele[indexEle][] is an element. These are in 'file' coordinates (not "image" coordinates.)

Returns:

latlon[][] array of lat/long pairs. Output array is latlon[indexLat][] of latitudes and latlon[indexLon][] of longitudes.

toLinEle

public double[][] toLinEle(double[][] latlon)

toLinEle converts lat/long to satellite line/element

Specified by:

toLinEle in class AREAnav

Parameters:

latlon - array of lat/long pairs. Where latlon[indexLat][] are latitudes and latlon[indexLon][] are longitudes.

Returns:

linele[][] array of line/element pairs. Where is an element. These are in 'file' coordinates (not "image" coordinates);