6). Unclassified area
This referred to the area without sufficient information required for land suitability
classification. These included wetland or waterlogged sites in the province which occupied total
area of 422.024 km2 or 3.60%.
7). Surface water
This area was presented based on Landsat satellite imagery recorded between 1999-2000.
It occupied total area of 260.114 km2 or 2.22% of the province.
other combinations. In Udon Thani, there were altogether 3 areas which fell into this cattery
occupying total area of 1,381.144 km2 or 11.78% of the province.