How to Extract Landslide Slope and Grid Unit Using QGIS only

Learn to build sophisticated landslide susceptibility maps with QGIS! This course, developed by Omar F. Althuwaynee, PhD in GIS and Geomatics Engineering, empowers you to leverage the power of QGIS for advanced spatial analysis.

Discover how to:

• Unlock QGIS Processing Toolbox: Master the powerful functions within QGIS's processing toolboxes.
• Install Free QGIS Tools: Learn to easily install and utilize valuable, free tools within your QGIS environment.
• Extract Grid Units (GU) & Morphological Slope Units (SU): Understand the process of extracting crucial GU and SU data for effective mapping.
• Automate Training & Testing Data Creation: Generate training data and testing data automatically – a vital step for data mining models like logistic regression and Artificial Neural Networks (ANN). This process is broken down into easy, step-by-step instructions.
• Efficient Mapping Techniques: Run GU and SU mapping techniques in QGIS with less than 5 steps per type.

Why QGIS? QGIS is a powerful, open-source GIS solution that's free of charge. Its user-friendly interface makes it ideal for students and universities, especially in resource-constrained environments.

By the end of this course, you'll be able to efficiently and automatically create the necessary training data for preparing landslide susceptibility mapping using the QGIS modeler.

February 2022 Update

The "Model tools" – LaGriSU (Landslide-Grid-and-Slope-Units-QGIS_ToolPack) – have been significantly updated!

• Improved Performance: Experience faster processing times.
• Compatibility: Works seamlessly with QGIS versions 3.10, 3.12, and 3.14 (both 64-bit and 32-bit). Tested on Windows and Linux.
• Robust Landslide-Free Area Definition: Enhanced techniques for defining landslide-free zones:
  • Buffer zones
  • Slope value threshold
• Comprehensive Data Handling: Supports both point and polygon feature inventories.
• Detailed Reporting: Includes box plots summarizing value statistics within landslide locations and comprehensive summary reports.

March 2023 Update

Addressing stability and accuracy:

• Resolved stability issues related to large areas, geometry errors, and dissolve operations.
• Slope Units: Implemented binary sampling (1,0) for a more balanced 1:1 ratio in training and testing datasets.
• Removed small polygon (pixel-shaped) Slope Units to improve accuracy.

Find the latest version on GitHub: search for /Althuwaynee/LaGriSU_Landslide-Grid-and-Slope-Units-QGIS_ToolPack

Keywords: QGIS, GIS, automatic, tools, modeler, mapping, susceptibility, landslide mapping, spatial analysis, open source, free software.