e, latitude and height of each point
$     followed by ny triplets of integer numbers between 1 and nx giving the triangular connectivity
Whataroa.dat

$ (3) the number of points in the longitude and latitude directions, respectively
$     if they are negative, they correspond to the total number of points and the number of triangles connecting them
121 74

$ (4) the spacing in degrees of longitude and latitude, respectively
$     This is not used in case nx and ny are negative (random grid)
0.00833333 0.00