appiahkubis14/pygeovision-accra-change-detection

1. pygeovision-ghana-urban-analysis 2. landsat-change-detection-accra 3. pygeovision-showcase-accra 4. geoai-urban-expansion-ghana 5. accra-landsat-change-detection # PyGeoVision: Accra Change Detection & LULC Analysis ## 🌍 Overview This project demonstrates a complete geospatial analysis workflow using **PyGeoVision** - the unified platform combining satellite data access (22+ providers) with state-of-the-art GeoAI. The analysis focuses on **Accra, Ghana**, tracking urban expansion and vegetation change from 2020 to 2024 using Landsat 7 ETM+ imagery. *Complete 9-panel analysis showing RGB composites, NDVI, change detection, and LULC classification* ## 📊 Key Results | Metric | Value | Visualization | |--------|-------|---------------| | **Urban Area (2024)** | 68.1% | 🏙️ | | **Forest Cover (2024)** | 0.0% | 🌳 | | **Water Bodies (2024)** | 31.6% | 💧 | | **Net Vegetation Change** | +1.2% | 📈 | | **Buildings Detected** | 120 | 🏢 | ## 📸 Analysis Visualizations ### Land Use/Land Cover Classification (2024) *Rule-based classification showing 5 land cover classes: Water (Blue), Urban (Brown), Sparse Vegetation (Light Green), Agriculture (Khaki), Dense Forest (Forest Green)* ### Vegetation Change Detection (2020 → 2024) *5-class change detection: Severe Loss (Dark Red), Moderate Loss (Crimson), Stable (Gray), Moderate Gain (Lime Green), Severe Gain (Dark Green)* ### True Color RGB Comparison | 2020 | 2024 | |------|------| | | | *Landsat true color composites showing urban expansion and land cover changes* ### Building Footprint Detection *Deep learning-based building extraction detected **120 building footprints** in the Greater Accra region* ### Spectral Indices Analysis | NDVI 2020 | NDVI 2024 | NDWI 2024 | |-----------|-----------|-----------| | | | | *Normalized Difference Vegetation Index (NDVI) and Water Index (NDWI) showing vegetation health and water bodies* ## 🚀 Features Demonstrated ### Data Acquisition - **PyGeoFetch**: 22+ satellite providers (Planetary Computer, USGS, AWS) - **Search & Download**: Automated scene selection based on cloud cover - **Po …