Table 3. Division of orthophoto area.

Partition number	Built-up area	Housing quantity
L1	0.84	68
L2	0.72	62
L3	0.52	89
L4	0.57	70
L5	0.73	54
R1	1.93	168
R2	0.92	107
R3	0.51	33
R4	0.41	60
R5	0.41	91
Attached hydraulic facilities	-	59
Total	7.56	861