Table 2.

The positional errors of gully for the two approaches (unit: m).

Interpreting approach	Gully head			Gully edge line
	Min	Max	Mean	Min	Max	Mean
Using RS only	0.012	48.669	5.566	0.014	59.506	10.036
Using fused image	0.002	6.315	2.202	0	9.583	3.271