Analysis of Factors Influencing Spatial Distribution of Soil Erosion under Diverse Subwatershed Based on Geospatial Perspective: A Case Study at Citarum Watershed, West Java, Indonesia
Table 1
List of required data inputs for the InVEST-SDR and Geodetector models.
Data description
Source
Processing
Spatial resolution
(a) InVEST-SDR model
Digital elevation model
Shuttle Radar Topography Mission (SRTM) Global (USGS)
—
30 m × 30 m
Land use/land cover (LULC) data
Landsat/8 OLI imageries with acquisition date in 2000 (https:/www.usgs.gov/ and Google Earth Engine)
Supervised classification
30 m × 30 m
Precipitation data
Meteorological, Climatological, and Geophysical Agency
Numeric or tabular data, along with location coordinates, are processed using a spline interpolation method
30 m × 30 m
Isoerosivity map (R factor)
Soil data
Indonesian Soil Research Institute (the soil map type of 1 : 100,000)
Vector file
30 m × 30 m
Soil erodibility map (K factor)
Watershed boundary data
Citarum-Ciliwung Watershed Management Center
Vector file
—
Data biophysical table (PUSLE and CUSLE)
FAO.org
(.csv)
30 m × 30 m
(b) Geodetector model
(1) Physical data
(1.1) Topographic factors
Slope (variable name: XA1)
Shuttle Radar Topography Mission (SRTM) Global (USGS)
Calculation from DEM (X2)
30 m × 30 m
Digital elevation model (DEM) (variable name: XA2)
Shuttle Radar Topography Mission (SRTM) Global (USGS)
—
30 m × 30 m
(1.2) Climate factor
Annual average temperature (TEM) (variable name: XA3)
Meteorological, Climatological, and Geophysical Agency
Numeric or tabular data, along with location coordinates, are processed using a spline interpolation method
30 m × 30 m
Annual average precipitation, PRE (variable name: XA4)
Meteorological, Climatological, and Geophysical Agency
Numeric or tabular data, along with location coordinates, are processed using a spline interpolation method
30 m × 30 m
(1.3) Vegetation factor
Net primary production (NPP) (variable name: XA5)
MODIS-MOD17A3HGF V6.1 product in 2000, 2010, and 2020 (https:/www.usgs.gov/ and Google Earth Engine)
The sum of all 8-day net photosynthesis is the difference between the gross primary productivity and maintenance respiration. Resampling from 500 m × 500 m
