Calculating the Density of Trees in Paddy Fields
All of the tree canopies inside the boundaries of the
paddy fields within each grid cell were counted using the
naked eye of the analyst. In those cases, when there
were several trees forming a single cluster, and it was
not possible to count each tree individually due to
insufficient resolution, the whole cluster was counted as
one tree. In many cases, these clusters are clumps of
bamboo while, in other cases, they are composed of
several small trees growing closely together on top of a
termite mound, so are functionally equivalent to a single
tree. An example of counting trees in paddy fields is
shown in Fig. 3. Once the total number of trees in all of
the paddy fields within a grid cell was established, then
the density of trees was calculated with the following
formula using Arc View:
The mean density of trees in paddy fields number/ha ð Þ
¼ total number of trees in paddy fields/area
of paddy fields ha ð Þ:
Based on the calculated mean density of trees in paddy
fields in the selected grid cells, a map of the mean density
zones of trees in paddy fields was made by using the
kriging method.