cdm/src/main/java/ucar/unidata/geoloc/projection/sat/GEOSTransform.java
public double[] FGFtoEarth(double fgf_x, double fgf_y, double scale_x, double offset_x, double scale_y, double offset_y) {
    double[] xy = FGFtoSat(fgf_x, fgf_y, scale_x, offset_x, scale_y, offset_y);
    return satToEarth(xy[0], xy[1]);
  }
public double[] FGFtoEarth(double fgf_x, double fgf_y, double scale_x, double offset_x, double scale_y, double offset_y) {
    double[] xy = FGFtoSat(fgf_x, fgf_y, scale_x, offset_x, scale_y, offset_y);
    return satToEarth(xy[0], xy[1]);
  }
Transform fractional FGF coordinates to (longitude, latitude).

@param fgf_x    fractional FGF coordinate, zero-based
@param fgf_y    fractional FGF coordinate, zero-based
@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