Globdrought

Code for Drought Indices and Trends Calculation

Global Mann-Kendall Trend Analysis and SPEI Calculation

Overview

This repository contains R scripts for calculating and visualizing the Standardized Precipitation Evapotranspiration Index (SPEI) and performing Mann-Kendall (MK) trend analysis on a global scale (NetCDF). The scripts generate trend maps and other visual outputs for analyzing long-term hydroclimatic trends.

Features

• SPEI Calculation: Computes the Standardized Precipitation Evapotranspiration Index (SPEI) for different time scales.
• Mann-Kendall Trend Analysis: Detects trends in global SPEI time series.
• Spatial Visualization: Uses rasterVis and latticeExtra to plot trends over global datasets.
• NetCDF Data Handling: Reads and processes NetCDF files containing climate variables.
• Shapefile Integration: Overlays country/continent boundaries on plots for better visualization.

Dependencies

Ensure the following R packages are installed before running the scripts:

install.packages(c("raster", "spei","ncdf4", "SPEI", "Kendall", "trend", "rasterVis", "sp", "latticeExtra"))