generate error ellipses from x,y coordinates, semi-major, semi-minor axes and ellipse orientation
| 1 | 
| x | x-coordinate, usually in projected units (km) | 
| y | y-coordinate, usually in projected units (km) | 
| a | ellipse semi-major axis (km) | 
| b | ellipse semi-minor axis (km) | 
| theta | ellipse orientation from north (degrees) | 
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