abeylicious/lagos-maiduguri-climate

20-year hydro-thermal climate analysis evaluating monthly thermal maximums in Maiduguri and precipitation dynamics in Lagos using TerraClimate in GEE. # 🌡️ Subsaharan Africa Climate Dynamics Suite This repository evaluates two decade-long (2006 to 2026) hydro-thermal climate profiles in Sub-Saharan Africa using **IDAHO_EPSCOR/TERRACLIMATE** high-resolution monthly climate data processed via Google Earth Engine (GEE). The analysis evaluates two contrasting agro-ecological and climatic extremes in Nigeria: * **Sudano-Sahelian Thermal Maximums (Maiduguri City, Borno State):** Tracking extreme monthly maximum (`tmmx`) and minimum (`tmmn`) temperature variations in an arid Northern urban hub. * **Coastal Atlantic Precipitation Patterns (Lagos City, Lagos State):** Evaluating monthly cumulative rainfall dynamics (`pr`) in a tropical coastal megacity. ## 📊 Study Area Coordinates & Datasets | Location | Coordinates (Lon, Lat) | Primary Metric Assessed | Dataset Used | | :--- | :--- | :--- | :--- | | **Maiduguri City** | `[13.1500, 11.8333]` | Monthly Max & Min Temp (°C) | TerraClimate (`tmmx`, `tmmn`) | | **Lagos City** | `[3.3792, 6.5244]` | Monthly Total Precipitation (mm) | TerraClimate (`pr`) | ## 🔬 Processing Pipeline & Band Scaling Raw TerraClimate temperature bands (`tmmx` and `tmmn`) are stored as integers with a scale factor of **0.1**. A custom transformation function applies the $0.1$ multiplier to convert raw values into actual degrees Celsius (°C): ```javascript // Function to scale temperatures and isolate precipitation var prepClimate = function(image) { var maxTempC = image.select('tmmx').multiply(0.1).rename('temp_max_c'); var minTempC = image.select('tmmn').multiply(0.1).rename('temp_min_c'); var precip = image.select('pr').rename('precipitation_mm'); return image.addBands([maxTempC, minTempC, precip]); }; ``` ## 📈 Visual Outputs & Time Series Trends ### 1. Maiduguri City Monthly Temperature (2006–2026) ### 2. Lagos City Monthly Precipitation (2006–2026) --- ## 📌 Key Analytical Findings ### 🌡️ Maiduguri Thermal Dynamics (Sahelian Zone) * **Extreme Seasonal Fluctuation:** Maximum temperatur …