Zotahina-Rakotomahefa/bioclimatic-stress-bernieria-madagascar

Geospatial bioclimatic stress modeling and Climate Stress Index (CSI) analysis for Bernieria madagascariensis in Madagascar using raster and species occurrence data. # Bioclimatic Stress Analysis of Bernieria madagascariensis A geospatial climate stress modeling project combining raster-based bioclimatic variables and species occurrence data to assess environmental vulnerability patterns in Madagascar. --- ## Overview This project computes a **Climate Stress Index (CSI)** using selected bioclimatic variables and evaluates its spatial relationship with occurrences of *Bernieria madagascariensis* across two districts: - Moramanga - Maroantsetra The workflow integrates raster processing, threshold modeling, spatial clipping, and geospatial visualization. --- ## Objectives - Clip bioclimatic rasters to district boundaries - Compute climate thresholds dynamically - Generate a composite Climate Stress Index - Overlay species occurrences - Produce comparative stress maps --- ## Project structure ``` project/ ├── outputs/ # Generated rasters ├── notebooks/ # Jupyter notebooks ├── src/ # Python scripts ├── requirements.txt └── README.md ``` ## Installation ```bash pip install -r requirements.txt ``` --- ## Data Sources The datasets used in this project are not included in this repository due to size and licensing constraints. ### Bioclimatic Variables Source: WorldClim Version 2.1 worldclim.org Variables used: BIO12 (Annual Precipitation), BIO15 (Precipitation Seasonality), BIO19 (Precipitation of Coldest Quarter) ### Administrative Boundaries Source: GADM (Global Administrative Areas) gadm.org ### Species Occurrence Data Source: GBIF (Global Biodiversity Information Facility) Invasive and Introduced Pla… Species searched: *Bernieria madagascariensis* --- ## Methodology ### Data Loading - Administrative boundaries - Species occurrence records - Bioclimatic raster variables (BIO12, BIO15, BIO19) ### Spatial Processing - District-level clipping using `geopandas` and `rioxarray` - Raster masking outside district boundaries ### Threshold Computation Dynamic th …