1) Area constraint: The total area of planting must not
greater than the available area.
1 1 1
I J K
ijk i
i j k
X s A
(2)
where si is the area required to plant tree i and A is a total
available area.
2) Singularity constraint: Only one tree can be planted at
only one position.
1
1; ,
m
ijk
i
X j k
(3)
3) Carbon sequestration constraint: The total amount of
carbon sequestration by all trees must greater than the
required amount of carbon absorption.
1 1 1
I J K
ijk i
i j k
X a L
(4)
where L is an amount of required carbon sequestration
4) Tree distribution constraint: This constraint ensures a
distribution of trees throughout the area. In addition, the
similar type of tree should not grow next to each other
since its growth rate can be harmful.
1; ijk imn X X i (5)
where m {j-1, j, j+1} and n {k-1, k, k+1}
5) 0-1 Integer constraint: All decision variables are either