cdm/src/main/java/ucar/unidata/geoloc/projection/sat/GEOSTransform.java
public double[] SatToFGF(double lamda, double theta, double scale_x, double offset_x, double scale_y, double offset_y) {
    double fgf_x = (lamda - offset_x) / scale_x;
    double fgf_y = (theta - offset_y) / scale_y;
    return new double[]{fgf_x, fgf_y};
  }
public double[] SatToFGF(double lamda, double theta, double scale_x, double offset_x, double scale_y, double offset_y) {
    double fgf_x = (lamda - offset_x) / scale_x;
    double fgf_y = (theta - offset_y) / scale_y;
    return new double[]{fgf_x, fgf_y};
  }
Transform (lamda, theta) in radians to fractional FGF coordinates.

@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