# Regional Greening as a 'Positive' Tipping Phenomenon ## Contents - [Overview](#overview) - [Repo Contents](#repo-contents) - [System Requirements](#system-requirements) - [Installation Guide](#installation-guide) - [Demo](#demo) # Overview The Python codes for our paper "Regional Greening as a 'Positive' Tipping Phenomenon". # Repo Contents - [Code](./Code): main code for simulation and visualization - [Tibet](Code/Tibet) : site percolation simulation and related analysis for Qinghai-Tibetan Plateau (QTP) area. - [EVI_Percolation](Code/Tibet/EVI_Percolation): fragment-size distribution exponent and fractal dimensions for QTP - [EVI_Percolation_Shuffle](Code/Tibet/EVI_Percolation_Shuffle): null models for QTP - [EVI_Percolation_Snapshots](Code/Tibet/EVI_Percolation_Snapshots): correlation length and susceptibility for QTP - [EVI_Percolation_Protection](Code/Tibet/EVI_Percolation_Protection): Optimal enhancing resilience model for QTP - [EVI_Enhanced](Code/Tibet/EVI_Enhanced): Enhanced EVI Coverage for QTP - [Sahel](Code/Sahel) site percolation simulation and related analysis for Sahel area. - [EVI_Percolation](Code/Sahel/EVI_Percolation): fragment-size distribution exponent and fractal dimensions for Sahel - [EVI_Percolation_Shuffle](Code/Sahel/EVI_Percolation_Shuffle): null models for Sahel - [EVI_Percolation_Snapshots](Code/Sahel/EVI_Percolation_Snapshots): correlation length and susceptibility for Sahel - [EVI_Percolation_Protection](Code/Sahel/EVI_Percolation_Protection): Optimal enhancing resilience model for Sahel - [EVI_Enhanced](Code/Sahel/EVI_Enhanced): Enhanced EVI Coverage for Sahel - [Plot_Figs](Code/Plot_Figs) : Draw the pictures - [GEE_Data_Download_Script](./GEE_Data_Download_Script): scripts to download data from Google Earth Engine (GEE) - [Shapefile](./Shapefile): shapefiles used to select the Sahel and Tibet regions in the study. - [SRCJl](./SRCJl) and [SRCPy](./SRCPy) : custom function libraries. # System Requirements ## Software Requirements ### OS Requirements The package development version is tested on *Linux* operating systems. The developmental version of the package has been tested on the following systems: Linux: Ubuntu 22.04 # Installation Guide 1. Users should build Python (3.9) and Julia (1.9) environment first. For Python, visit [https://www.anaconda.com/download](https://www.anaconda.com/download) to download and install the Anaconda distribution. For Julia, go to [https://julialang.org/downloads/](https://julialang.org/downloads/) and download the Julia installer for your platform. Follow the installation instructions provided on these websites. 2. Compile the libraries. ``` cd SRCJl\Flib\sitep bash compile_site_percolation.sh ``` # Prepare Data 1. Download data from GEE by using the [GEE_Data_Download_Script](./GEE_Data_Download_Script) and [shapefile](./Shapefile). 2. Place the data in the corresponding path: - MODIS EVI V6 (QTP): [Code/Tibet/Data/Tibet_EVI_V6/Summer](Code/Tibet/Data/Tibet_EVI_V6/Summer/) - MODIS EVI V6 (Sahel) : [Code/Sahel/Data/Sahel_EVI_V6/Summer](Code/Sahel/Data/Sahel_EVI_V6/Summer/) - TerraClimate Summer precipitation (QTP) : [Code/Tibet/Data/Tibet_TerraClimate_pr_Summer](Code/Tibet/Data/Tibet_TerraClimate_pr_Summer) - TerraClimate Summer precipitation (Sahel) : [Code/Tibet/Data/Sahel_TerraClimate_pr_Summer](Code/Sahel/Data/Tibet_TerraClimate_pr_Summer) # Demo ``` cd Code/Sahel/EVI_Percolation bash run_all.sh ``` ``` cd Code/Tibet/EVI_Percolation_Shuffle bash run_all.sh ``` ``` cd Code/Tibet/EVI_Percolation_Snapshots bash run_all.sh ``` ``` cd Code/Tibet/EVI_Percolation_Protection bash run_all.sh ``` ``` cd ode/Tibet/EVI_Enhanced bash run_all.sh ```