kobbyea/Accra-Flood-Risk-Automation

A Python (ArcPy) script that automates a multi-criteria spatial flood risk model. # Accra-Flood-Risk-Automation A Python (ArcPy) script that automates a multi-criteria spatial flood risk model. Automated Flood Risk Spatial Model Project Overview The script now runs the complete workflow end to end Slope calculation, Reclassification, and Weighted Overlay starting directly from a raw DEM, rather than assuming pre-reclassified inputs already exist. The Problem Traditional flood modeling in GIS requires manually running sequential geoprocessing tools (Slope calculation, Reclassification, Weighted Overlay), which is time-consuming and prone to human error when adjusting parameters. The Solution I built a Python script that bypasses the manual interface, handles file management, and executes the spatial logic instantly. Methodology & Logic The model uses a multi-criteria decision matrix with the following weights: Elevation (60% Influence): Reclassified so lower elevations present a higher risk. Slope (40% Influence): Reclassified so flatter terrain (where water pools) presents a higher risk. Technologies Used Python ArcPy (ArcGIS Spatial Analyst) Digital Elevation Models (DEM)