Since Pathumthani is repeatedly flooded, the factors
mentioned above will be sampled from the GIS
recorded in 2011, 2006 and 2010, when the city was in
respective order, the most severely affected by flood.
The reason for those 3 years were taken into account
instead of a specific one alone is to remove irregularities
that might have been caused by other data
irrelevant matters, for in-stance, politics, and administrative
ambiguity and disagreements, etc. The sampling
was made uniformly 1000 instances/ year.