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    An ellipsoid may be specified by its semimajor axis a and its      
    flattening f, or one of the following ellipsoids may be selected   
    by its index idx (semimajor axes in meters):                       
     0  Sphere with radius of 6371000 m                                
     1  Airy 1830                                                      
     2  Australian National 1965                                       
     3  Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)                
     4  Bessel 1841 (Namibia)                                          
     5  Clarke 1866                                                    
     6  Clarke 1880                                                    
     7  Everest (Brunei, E. Malaysia)                                  
     8  Everest (India 1830)                                           
     9  Everest (India 1956)                                           
    10  Everest (Pakistan)                                             
    11  Everest (W. Malaysia, Singapore 1948)                          
    12  Everest (W. Malaysia 1969)                                     
    13  Geodetic Reference System 1980 (GRS 1980)                      
    14  Helmert 1906                                                   
    15  Hough 1960                                                     
    16  Indonesian 1974                                                
    17  International 1924 / Hayford 1909                              
    18  Krassovsky 1940                                                
    19  Modified Airy                                                  
    20  Modified Fischer 1960                                          
    21  South American 1969                                            
    22  World Geodetic System 1972 (WGS 1972)                          
    23  World Geodetic System 1984 (WGS 1984) / NAD 1983               


 UTM grid:
 The Universal Transverse Mercator (UTM) system is a world wide
 coordinate system defined between 80S and 84N. It divides the
 Earth into 60 six-degree zones. Zone number 1 has its central
 meridian at 177W (-177 degrees), and numbers increase eastward.

 Within each zone, an Easting of 500,000 m is assigned to its 
 central meridian to avoid negative coordinates. On the northern
 hemisphere, Northings start at 0 m at the equator and increase 
 northward. On the southern hemisphere a false Northing of 
 10,000,000 m is applied, i.e. Northings start at 10,000,000 m at 
 the equator and decrease southward.

 Coordinate encoding (sx,sy,gx,gy):
    counit=1  units of length (coordinates are not converted)
    counit=2  seconds of arc
    counit=3  decimal degrees 
    counit=4  degrees, minutes and seconds encoded as integer DDDMMSS 
              with scalco=1 or DDDMMSS.ss with scalco=-100 (see segy.h)
 Units of length are also assumed, if counit <= 0 or counit >= 5.


 Author: 
    Nils Maercklin, RISSC, University of Naples, Italy, March 2007

 References:
 NIMA (2000). Department of Defense World Geodetic System 1984 - 
    its definition and relationships with local geodetic systems.
    Technical Report TR8350.2. National Imagery and Mapping Agency, 
    Geodesy and Geophysics Department, St. Louis, MO. 3rd edition.
 J. P. Snyder (1987). Map Projections - A Working Manual. 
    U.S. Geological Survey Professional Paper 1395, 383 pages.
    U.S. Government Printing Office.


 Trace header fields accessed: sx, sy, gx, gy, scalco, counit
 Trace header fields modified: sx, sy, gx, gy, scalco, counit