LAW128/Tortoise-Turtle-ValueChain-GIS-Ghana

GIS analysis of tortoise/turtle trade value chain in Ghana using survey data # Tortoise/Turtle Value Chain GIS Analysis in Ghana **Author:** Lawrence Kofi Amoako **Date:** January 2026 ## Overview This GIS project maps the value chain of tortoise and turtle products in Ghana, based on primary field survey data collected from respondents in three ecologically distinct locations: - Half Assin (High Rainforest zone) - Nkawkaw (Semi-Deciduous Forest zone) - Tamale (Savannah zone) The analysis visualizes: - Origin-destination flows from sourcing areas to local communities, roadside markets, and urban markets - Exploitation pressure (total annual volume per location) - Differences in value chain structure across habitat zones - Key intervention leverage points (convergence at roadside and urban markets) **Important Note on Data Privacy** The raw survey data (CSV/Excel) used in this project is third-party primary data and **is not shared** in this repository due to confidentiality and ethical considerations. All results, maps, and diagrams are derived from aggregated and anonymized processing of the original data. ## Key Outputs - **ValueChain_Flows_Layout.pdf / .png**: High-resolution composite thematic map (QGIS Print Layout) showing flows, pressure (point size/color), habitat zones, and labeled destinations - **ValueChain_Flows_Final.png**: Standalone thematic map with flows, habitat colors, and key findings annotation - **ValueChain_Flows_Sankey.png**: Sankey diagram illustrating proportional flows by habitat and chain stage ## Processed Data (Included) GeoJSON files in `02_Processed_Data/`: - Aggregated origin points (mean coordinates, total volume) - Destination points (markets/roadside) - Ghana administrative boundaries - Agro-ecological zones ## Base Layers (Included) Shapefiles in `03_Base_Layers/`: - Administrative boundaries (GADM/HDX) - Roads (OpenStreetMap via HOT) - Agro-ecological zones (ICPAC Geoportal) ## QGIS Project - `04_QGIS_Project/Tortoise_Turtle_ValueChain_Gis_Project.qgz`: …