cdm/src/main/java/ucar/unidata/geoloc/projection/sat/GEOSTransform.java
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 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);
  }
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