Gradient
Calculation from fitting a plane to as many as fifteen points
a x 1 + b y 1 + c = h 1
a x 2 + b y 2 + c = h 2
a x 3 + b y 3 + c = h 3
. . .
a x 15 + b y 15 + c = h 15
where (x i,y i) are the coordinates of the
well and
h i is the head
i = 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
The coefficients a, b, and c are calculated by a least-squares
fitting of the the data to a plane
The gradient is calculated from the square root of (a 2 +
b 2 ) and the angle from the arctangent of a/b or b/a depending
on the quadrant |
