edu.wisc.ssec.mcidas
Class GVARnav

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

All Implemented Interfaces:

Serializable

public class GVARnav
extends AREAnav

The GVARnav class creates the ability to navigate GVAR image data. It is a math copy of the McIDAS nvxgvar.dlm code. When used with AreaFile class, set up like this:

  AreaFile af;
  try {
    af = new AreaFile("/home/user/mcidas/data/AREA0001");
  } catch (AreaFileException e) {
    System.out.println(e);
    return;
  }
  int[] dir;
  try { dir=af.getDir();
  } catch (AreaFileException e){
    System.out.println(e);
    return;
  }
  int[] nav;
  try { nav=af.getNav();
  } catch (AreaFileException e){
    System.out.println(e);
    return;
  }
  try { 
    GVARnav ng = new GVARnav(nav);  // XXXXnav is the specific implementation
  } catch (IllegalArgumentException excp) {
    System.out.println(excp);
    return;
  }
  ng.setImageStart(dir[5], dir[6]);
  ng.setRes(dir[11], dir[12]);
  ng.setStart(1,1);
  ......................
 

Author:

Tom Whittaker

See Also:

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

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

GVARnav(int ifunc, int[] iparms)
Deprecated. Since ifunc must be 1, replaced with #GVARnav(int[] iparms). If ifunc != 1, ifunc is set to 1.

Method Summary

double[]	getSubpoint() return the lat,lon of the subpoint
double[][]	toLatLon(double[][] linele) converts from satellite coordinates to latitude/longitude
float[][]	toLatLon(float[][] linele) converts from satellite coordinates to latitude/longitude
double[][]	toLinEle(double[][] latlon) toLinEle converts lat/long to satellite line/element
float[][]	toLinEle(float[][] 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, 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

GVARnav

public GVARnav(int[] iparms)
        throws IllegalArgumentException

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

Parameters:

iparms - the nav block from the image file

Throws:

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

GVARnav

public GVARnav(int ifunc,
               int[] iparms)
        throws IllegalArgumentException

Deprecated. Since ifunc must be 1, replaced with #GVARnav(int[] iparms). If ifunc != 1, ifunc is set to 1.

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

Parameters:

ifunc - the function to do (always 1 for now)

iparms - the nav block from the image file

Throws:

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

Method Detail

getSubpoint

public double[] getSubpoint()

return the lat,lon of the subpoint

Overrides:

getSubpoint in class AREAnav

Returns:

double[2] {lat, lon}

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

toLatLon

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

converts from satellite coordinates to latitude/longitude

Overrides:

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

toLinEle

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

toLinEle converts lat/long 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. These are in 'file' coordinates (not "image" coordinates);