How to use ucar.unidata.geoloc.projection.sat

public Geostationary() {
 super(NAME, false);
 navigation = new GEOSTransform();
 makePP();
}

public GEOSTransform(double subLonDegrees,
           double perspective_point_height,
           double semi_minor_axis,
           double semi_major_axis,
           String sweep_angle_axis) {
 Geoid geoid = new Geoid(semi_minor_axis, semi_major_axis);
 scan_geom = sweepAngleAxisToScanGeom(sweep_angle_axis);
 init(subLonDegrees, scan_geom, geoid, perspective_point_height);
}

private void makePP() {
 addParameter(CF.GRID_MAPPING_NAME, NAME);
 addParameter(CF.LONGITUDE_OF_PROJECTION_ORIGIN, navigation.sub_lon_degrees);
 addParameter(CF.LATITUDE_OF_PROJECTION_ORIGIN, 0.0);
 addParameter(CF.PERSPECTIVE_POINT_HEIGHT, navigation.sat_height * 1000.0);
 addParameter(CF.SWEEP_ANGLE_AXIS, GEOSTransform.scanGeomToSweepAngleAxis(navigation.scan_geom));
 addParameter(CF.SEMI_MAJOR_AXIS, navigation.r_eq * 1000.0);
 addParameter(CF.SEMI_MINOR_AXIS, navigation.r_pol * 1000.0);
}

/**
 * copy constructor - avoid clone !!
 */
@Override
public ProjectionImpl constructCopy() {
 return new MSGnavigation(lat0, lon0, 1000 * major_axis, 1000 * minor_axis, 1000 * sat_height, scale_x, scale_y);
}

/**
 * Create a ProjectionRect from the given LatLonRect.
 * Handles lat/lon points that do not intersect the projection panel.
 *
 * @param rect the LatLonRect
 * @return ProjectionRect, or null if no part of the LatLonRect intersects the projection plane
 */
@Override
public ProjectionRect latLonToProjBB(LatLonRect rect) {
 BoundingBoxHelper bbhelper = new BoundingBoxHelper(this, maxR);
 return bbhelper.latLonToProjBB(rect);
}

public Geostationary(double subLonDegrees, String sweepAngleAxis, double geoCoordinateScaleFactor) {
 super(NAME, false);
 String scanGeometry = GEOSTransform.sweepAngleAxisToScanGeom(sweepAngleAxis);
 navigation = new GEOSTransform(subLonDegrees, scanGeometry);
 if (geoCoordinateScaleFactor > 0) {
  isGeoCoordinateScaled = true;
  this.geoCoordinateScaleFactor = geoCoordinateScaleFactor;
 }
 makePP();
}

public GEOSTransform(double subLonDegrees,
           double perspective_point_height,
           double semi_minor_axis,
           double semi_major_axis,
           String sweep_angle_axis) {
 Geoid geoid = new Geoid(semi_minor_axis, semi_major_axis);
 init(subLonDegrees, scan_geom, geoid, perspective_point_height);
}

/**
 * copy constructor - avoid clone !!
 */
@Override
public ProjectionImpl constructCopy() {
 // constructor takes sweep_angle_axis, so need to translate between
 // scan geometry and sweep_angle_axis first
 // GOES: x
 // GEOS: y
 String sweepAxisAngle = GEOSTransform.scanGeomToSweepAngleAxis(navigation.scan_geom);
 return new Geostationary(navigation.sub_lon_degrees, sweepAxisAngle, geoCoordinateScaleFactor);
}

/**
 * Transform integer FGF coordinates to (longitude, latitude) of pixel center
 * The (i,j) pixel, zero-based, refers to the pixel center.
 *
 * @param scale_x  scaleFactor from the x coordinate variable
 * @param offset_x addOffset from the x coordinate variable
 * @param scale_y  scaleFactor from the y coordinate variable
 * @param offset_y addOffset from the y coordinate variable
 * @return (Longitude, Latitude), units: degrees, of FGF (i,j) pixel center
 */
public double[] elemLineToEarth(int elem, int line, double scale_x, double offset_x, double scale_y, double offset_y) {
 return FGFtoEarth((double) elem, (double) line, scale_x, offset_x, scale_y, offset_y);
}

/**
 * copy constructor - avoid clone !!
 */
@Override
public ProjectionImpl constructCopy() {
 return new Geostationary(navigation.sub_lon_degrees, navigation.scan_geom);
}

public Geostationary() {
 super(NAME, false);
 navigation = new GEOSTransform();
 makePP();
}

/**
 * Create a ProjectionRect from the given LatLonRect.
 * Handles lat/lon points that do not intersect the projection panel.
 *
 * @param rect the LatLonRect
 * @return ProjectionRect, or null if no part of the LatLonRect intersects the projection plane
 */
@Override
public ProjectionRect latLonToProjBB(LatLonRect rect) {
 BoundingBoxHelper bbhelper = new BoundingBoxHelper(this, maxR);
 return bbhelper.latLonToProjBB(rect);
}

public Geostationary(double subLonDegrees, boolean isSweepX) {
 super(NAME, false);
 String sweepAngleAxis = "y";
 if (isSweepX) {
  sweepAngleAxis = "x";
 }
 String scanGeometry = GEOSTransform.sweepAngleAxisToScanGeom(sweepAngleAxis);
 navigation = new GEOSTransform(subLonDegrees, scanGeometry);
 makePP();
}

/**
 * Transform integer FGF coordinates to (longitude, latitude) of pixel center
 * The (i,j) pixel, zero-based, refers to the pixel center.
 *
 * @param scale_x  scaleFactor from the x coordinate variable
 * @param offset_x addOffset from the x coordinate variable
 * @param scale_y  scaleFactor from the y coordinate variable
 * @param offset_y addOffset from the y coordinate variable
 * @return (Longitude, Latitude), units: degrees, of FGF (i,j) pixel center
 */
public double[] elemLineToEarth(int elem, int line, double scale_x, double offset_x, double scale_y, double offset_y) {
 return FGFtoEarth((double) elem, (double) line, scale_x, offset_x, scale_y, offset_y);
}

public Geostationary(double subLonDegrees) {
 super(NAME, false);
 navigation = new GEOSTransform(subLonDegrees, GEOSTransform.GOES);
 makePP();
}

/**
 * Create a ProjectionRect from the given LatLonRect.
 * Handles lat/lon points that do not intersect the projection panel.
 *
 * @param rect the LatLonRect
 * @return ProjectionRect, or null if no part of the LatLonRect intersects the projection plane
 */
@Override
public ProjectionRect latLonToProjBB(LatLonRect rect) {
 BoundingBoxHelper bbhelper = new BoundingBoxHelper(this, maxR);
 return bbhelper.latLonToProjBB(rect);
}

public Geostationary(double subLonDegrees) {
 super(NAME, false);
 navigation = new GEOSTransform(subLonDegrees, GEOSTransform.GOES);
 makePP();
}

/**
 * Create a ProjectionRect from the given LatLonRect.
 * Handles lat/lon points that do not intersect the projection panel.
 *
 * @param rect the LatLonRect
 * @return ProjectionRect, or null if no part of the LatLonRect intersects the projection plane
 */
@Override
public ProjectionRect latLonToProjBB(LatLonRect rect) {
 BoundingBoxHelper bbhelper = new BoundingBoxHelper(this, maxR);
 return bbhelper.latLonToProjBB(rect);
}

public Geostationary(double subLonDegrees, boolean isSweepX) {
 super(NAME, false);
 String scanGeometry = GEOSTransform.GOES;
 if (!isSweepX) {
  scanGeometry = GEOSTransform.GEOS;
 }
 navigation = new GEOSTransform(subLonDegrees, scanGeometry);
 makePP();
}

public Geostationary(double subLonDegrees, String sweepAngleAxis) {
 super(NAME, false);
 String scanGeometry = GEOSTransform.GOES;
 if (sweepAngleAxis.equals("x")) {
   scanGeometry = GEOSTransform.GOES;
 }
 else if (sweepAngleAxis.equals("y")) {
   scanGeometry = GEOSTransform.GEOS;
 }
 navigation = new GEOSTransform(subLonDegrees, scanGeometry);
 makePP();
}