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The study area

Gravel. BSW. USW. NP. Figure 2. Representative semi- variogram of gravel and flow types in the study area. A. B. C. i. i. i. iii. iii. iii. ii. ii. ii. i. i. i. ii. ii. ii. iii. iii. iii. 6 m window size , stepping 6 m. 2 m window size , stepping 2 m.

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The study area

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  1. Gravel BSW USW NP Figure 2. Representative semi-variogram of gravel and flow types in the study area. A B C i i i iii iii iii ii ii ii i i i ii ii ii iii iii iii 6 m window size , stepping 6 m 2 m window size , stepping 2 m 6 m window size , stepping 2 m ii. (USW) i. (BSW) iii. (NP) Figure 4. False color images (after masking). R: PC1; G: PC2; B: PC1. The study area The study areais located near the confluence of Nan-Shih River and Pei-Shih River, northern Taiwan. The study area is 504 m x 504 m. The above ground features include gravel, low vegetation, forest, bridge and buildings. LiDAR data The LiDAR dataset of the study area was flown on 13 May 2008 at the altitude of 400 m. The dataset was delivered as an ASCII file containing xyz coordinates. The mean density in the resulting dataset is about 100 points per square meters. Study area Bei-shih River a c e PC1 Nan-shih River Figure 1. The study area. b d f PC2 Figure 3. Principle component images for: (a and b) window size of 6 m x 6 m and stepping distance of 6 m; (c and d) window size of 2 m x 2 m and stepping distance of 2 m; (e and f) window size of 6 m x 6 m and stepping window of 2 m. The arrows indicate noisy region.

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