edu.wisc.ssec.mcidas
Class GMSXnav

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

All Implemented Interfaces:

Serializable

public class GMSXnav
extends AREAnav

This class implements GMSX navigation. The code was modified from the original FORTRAN code (nvxgmsx.dlm) on the McIDAS system. It only supports latitude/longitude to line/element transformations (LL) and vice/versa. Transform to 'XYZ' not implemented.

Author:

Tommy Jasmin, University of Wisconsin, SSEC

See Also:

AREAnav, 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

GMSXnav(int[] navBlock)
constructor: copy nav block to a byte array, eliminating text fields

Method Summary

double[]	getSubpoint() Get the lat,lon of the subpoint if available
static byte[]	intToBytes(int v) intToBytes converts an int to an array of 4 bytes.
static void	main(String[] args)
double[][]	toLatLon(double[][] linele) converts from satellite coordinates to latitude/longitude
float[][]	toLatLon(float[][] linele) toLatLon converts satellite line/element to lat/lon
double[][]	toLinEle(double[][] latlon) toLinEle converts lat/long to satellite line/element
float[][]	toLinEle(float[][] latlon) toLinEle converts lat/lon to satellite line/element

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

GMSXnav

public GMSXnav(int[] navBlock)

constructor: copy nav block to a byte array, eliminating text fields

Parameters:

navBlock - - the navigation block from the image file

Method Detail

toLinEle

public float[][] toLinEle(float[][] latlon)

toLinEle converts lat/lon to satellite line/element

Overrides:

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 linele[indexLine][] is a line and linele[indexEle][] is an element.

toLinEle

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

Description copied from class: AREAnav

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 linele[indexLine][] is a line and linele[indexEle][] is an element. These are in 'file' coordinates (not "image" coordinates);

toLatLon

public float[][] toLatLon(float[][] linele)

toLatLon converts satellite line/element to lat/lon

Overrides:

toLatLon in class AREAnav

Parameters:

linele - array of line/element pairs. Where linele[indexLine][] is a line and linele[indexEle][] is an element.

Returns:

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

toLatLon

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

Description copied from class: AREAnav

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.

getSubpoint

public double[] getSubpoint()

Get the lat,lon of the subpoint if available

Overrides:

getSubpoint in class AREAnav

Returns:

double[2] {lat, lon}

intToBytes

public static byte[] intToBytes(int v)

intToBytes converts an int to an array of 4 bytes.

Parameters:

v - input value

Returns:

the corresponding array of bytes

main

public static void main(String[] args)