Simulating Land Use Change in the Seoul Metropolitan Area after Greenbelt Elimination Using the SLEUTH Model

Table 3

Environmental assessment grade based on six factors.

	Elevation	Slope	Flora	Forest	Agriculture suitability	Water quality
First grade	More than 201 m	More than 36 degrees	More than 41 years old and secondary forest	First grade of forest productivity	Agriculture development region	18–20
Second grade	161–200 m	26–35 degrees	21–40 years old and secondary forest; More than 41 years old and artificial forest	Second grade of forest productivity	Arable land rearrangement completed region; Agricultural water development completed region	14–17
Third grade	121–160 m	16–25 degrees	Less than 20 years old and secondary forest; 21–40 years old and secondary forest	Third grade of forest productivity	Arable land rearrangement arranged region; Agricultural water development arranged region; First and second grade of agricultural productivity	10–13
Fourth grade	81–120 m	6–15 degrees	Less than 20 years old and artificial forest	Fourth grade of forest productivity	Third and fourth grade of agricultural productivity	6–9
Fifth grade	Less than 80 m	Less than 5 degrees	Others	Fifth grade of forest productivity	Fifth grade of agricultural productivity; Others	0–5

considered due to the difficulty of data acquisition. score, which is the combined total of the scores for each item according to Table 4.