. Compute the accumulative least cost distance grid and the backlink grid where Grid A is the cost surface and Source computed in Part A where the cost per link is computed with the equation:

linkcost = Cell Size * (a1 + a2) / 2 or linkcost = 1.414 * Cell Size * (a1 + a2) / 2 on the diagonal

where a1 and a2 are the cost values in Grid A.

GRID A=

4	3	1	2
3	6	ND	1
1	4	ND	1
1	1	1	2

GRID B=

2	2	1	2
4	2	4	5
4	5	3	3
6	2	3	3

Accumulative Least Cost Distane=

Backlink=