Table 4.
Rules of every node in the hierarchical classification decision tree of sub region (3).
| Criterion code | Input data | Rules | Outputs when rules are met | Outputs when rules not met |
|---|---|---|---|---|
| C0 | Landsat time series data | Max(NDVI) ≤ 0.2 | Non-vegetated | Vegetated |
| C1 | MNDWI in summer season (May., Jun., Jul., Aug., and Sep.) from Landsat data | MNDWIsum ≥ 0 | Snow or water | Non-snow or water |
| C11 | Synthetic image in summer season from Landsat data,and SRTM data | ρ(blue) ≥ 0.1 | Snow or ice | Water |
| DEM ≥ 3500 | ||||
| C12 | Landsat time series data, Sentinel-1 SAR data, NPP-VIIRS night light data,and SRTM data | Max(NDVI) ≤ 0.35 | Impervious surface | Bareland |
| Slope ≤ 3 | ||||
| Median (Night light) ≥ 0.5 | ||||
| SAR_VV ≥ -13 | ||||
| SAR_VH ≥ -19 | ||||
| C2 | Monthly NDVI in Apr. and May | April(NDVI) ≥ 0.3 | Forest | Non-forest |
| May(NDVI) ≥ 0.5 | ||||
| C21 | Landsat time series data, Monthly NDVI in Oct., and SRTM data | (Oct(NDVI) ≥ 0.4) or ((Oct(NDVI) <0.4)and (Max(NDVI) ≥ 0.6)) | Cropland | Non-cropland |
| Slope ≤ 15 | ||||
| DEM ≤ 3000 | ||||
| C211 | Images in summer season (Jan., Feb., Mar., Apr., Nov., and Dec.) from Landsat data | ρ(swir1) <0.15 | Wetland | Non-wetland |
| C2111 | Synthetic image in summer season from Landsat data, Sentinel-1 SAR data | Sum Variance of Gray Level Co-occurrence Matrix (NIR) ≥ 1.8 | Shrubland | Grassland |
| SAR_VH ≥ −30 |