Landslide Susceptibility Analysis

Heuristic landslide susceptibility index (after Anbalagan 1992) using sigmoid-transformed slope, combined curvature, TWI, dual-scale TPI, TRI, and parabolic elevation risk profile. Produces an LSI scaled 0-100 with 5-level classification.

Inputs:

• Terrain Analysis Package (ZIP). ZIP file from Comprehensive Terrain Analysis containing DEM, slope, curvature, TWI, TPI, TRI rasters and manifest.json

• Weight: Slope (sigmoid). Weight for the sigmoid-transformed slope indicator (default: 0.30)

• Weight: Curvature. Weight for the combined curvature indicator (default: 0.15)

• Weight: TWI. Weight for the Topographic Wetness Index (default: 0.20)

• Weight: TPI. Weight for the dual-scale TPI indicator (default: 0.10)

• Weight: TRI. Weight for the Terrain Ruggedness Index (default: 0.15)

• Weight: Elevation Risk. Weight for the parabolic elevation risk profile (default: 0.10)

• Critical Slope Angle (degrees). Slope angle at the sigmoid inflection point in degrees (default: 25.0). Above this angle landslide risk increases sharply.

• Hotspot Threshold. LSI value above which areas are classified as hotspots (default: 70)

• Spectral Indices Package (ZIP). Optional ZIP from spectral_indices with vegetation index aggregates. When provided, a vegetation indicator is added to the weighted overlay.

• Weight: Vegetation Index. Weight for the vegetation index indicator (default: 0.10). Only used when spectral_zip is provided. Other weights are scaled down proportionally.

Outputs:

• Landslide Analysis Package (ZIP). ZIP archive with landslide susceptibility rasters, vectors, statistics, and manifest

• Summary. Human-readable summary of the landslide analysis results

• Manifest JSON. JSON manifest string describing all outputs

Example:

Try the tool in action

1. Click on the Demo button above the tool form. The fields are filled in with demo values.

2. Click on the Run button.