( Easting, Northing, Altitude )
(    0.00,     4.00,     0.00 ) 1
(    4.00,     0.00,     0.00 ) 2
(    8.00,     4.00,     0.00 ) 3
(    4.00,     8.00,     0.00 ) 4
(    4.00,     4.00,     0.00 ) a