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## 4 Extended GeoTIFF

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    This section is for future development TBD.
    Possible additional GeoKeys for Revision 2.0:
       PerspectHeightGeoKey   (General Vertical Nearsided Perspective)
       SOMInclinAngleGeoKey   (SOM)
       SOMAscendLongGeoKey    (SOM)
       SOMRevPeriodGeoKey     (SOM)
       SOMEndOfPathGeoKey     (SOM)  ? is this needed ?  SHORT
       SOMRatioGeoKey         (SOM)
       SOMPathNumGeoKey       (SOM)    SHORT
       SOMSatelliteNumGeoKey  (SOM)    SHORT
       OEAShapeMGeoKey        (Oblated Equal Area)
       OEAShapeNGeoKey        (Oblated Equal Area)
       OEARotationAngleGeoKey (Oblated Equal Area)
    Other items for consideration:
    o Digital Elevation Model information, such as Vertical Datums, Sounding Datums.
    o Accuracy Keys for linear, circular, and spherical errors, etc.

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    o Source information, such as details of an original coordinate system
      and of transformations between it and the coordinate system in which
      data is being exchanged.

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