Posts by Kartoza

Enhancing Disaster Management with QGIS and the InaSafe Plugin

In the ever-evolving landscape of disaster management, having the right tools to anticipate and respond to disasters can be the difference between preparedness and chaos. One such tool that has been making waves is InaSafe, an open-source plugin for QGIS designed to produce realistic natural hazard impact scenarios for better planning and response.

At the GISSA Gauteng session earlier this year, I demonstrated how InaSafe can empower disaster management professionals. My talk focused on how the tool can be used in practical, real-world scenarios, specifically through the analysis of flood events. Here’s a breakdown of my key points and insights from the session.

What is InaSafe?

InaSafe is a plugin that allows users to conduct impact assessments based on hazard and exposure data, like floods, earthquakes, or volcanic eruptions. The tool was developed to provide actionable information to help in making informed decisions during disaster management planning. One of InaSafe’s most powerful aspects is its ability to model different disaster scenarios and provide detailed analyses of their impacts on communities, infrastructure and the environment.

Website: InaSafe.org

Manual and Resources: InaSafe User Manual

The Power of Simple and Complex Analyses

During the session, I performed two different types of flood analysis to highlight the versatility of InaSafe.

Key Benefits for Disaster Management

1. Real-World Applications: InaSafe isn’t just theoretical—it’s actively used in disaster-prone regions around the world, from Southeast Asia to Africa. Governments, NGOs, and disaster response teams leverage it to improve preparedness and risk mitigation strategies.
2. Customisable Outputs: InaSafe allows users to generate tailored impact reports. These reports can include detailed statistics, maps, and charts, making it easy to communicate risks and necessary actions to decision-makers and stakeholders.
3. Community Driven: The tool is open-source and free, with a global community contributing to its development. This ensures that InaSafe stays up to date with the latest disaster management needs and best practices.

How to Get Started with InaSafe

If you're interested in exploring the power of InaSafe for your own disaster management needs, here’s a simple guide to get started:

Install the Plugin: InaSafe is available as a free plugin in QGIS. You can install it directly through the QGIS plugin manager.

Explore the Plugin: Familiarise yourself with the tool by exploring the various hazard and exposure datasets available.

Conduct a Simple Analysis: As demonstrated in the session, start with a basic hazard layer (e.g., flood, earthquake) and use the plugin to assess impacts on your region of interest.

Dive Deeper with Complex Analyses: For those looking to conduct more advanced studies, InaSafe supports custom inputs, more detailed parameters and sophisticated simulations.

1. Simple Analysis

We began with a basic flood scenario, demonstrating how easy it is to run an analysis using InaSafe once the plugin is installed in QGIS. For this exercise, I used predefined hazard and exposure layers, quickly generating an impact report. The simplicity of this analysis underscores InaSafe's accessibility for users, even those new to QGIS or GIS analysis. In just a few clicks, you can produce meaningful insights about potential flood impacts, helping first responders prioritise actions.

2. Complex Analysis

I then shifted to a more intricate analysis, integrating multiple datasets and refining parameters to simulate a more realistic and high-stakes flood scenario. This demonstrated InaSafe's capacity to handle complex scenarios where greater detail is needed—such as assessing the potential displacement of populations, the impact on critical infrastructure like roads and hospitals, or the number of affected households. The results of these analyses showed the breadth and depth of InaSafe’s capabilities. The tool can be used to assess anything from small, localised events to large-scale disasters with widespread impacts.

Wrapping Up

As we face an increasing number of natural disasters, tools like InaSafe are essential in helping us prepare, respond, and ultimately save lives. Whether you're a GIS professional or a disaster management planner, InaSafe provides a powerful, accessible platform to better understand the impacts of disasters before they strike. With its combination of simplicity and depth, it’s a tool that can truly transform the way we approach disaster management.

It was fantastic to catch up with the authors at the FOSS4G 2022 conference and talk about the new edition (and get some selfies). I was excited to receive a copy of QGIS for Hydrological Applications on my return from the conference and having taken the time to read and work through the book I have come to the following conclusion: QGIS for Hydrological Applications Second Edition is not just a book for Hydrologists but for anyone who wants to improve their QGIS skills through practical, real-world examples that happen to be hydrological. 

The book has eight Chapters: Preparing Data from Hard Copy Maps, Importing Tabular Data into QGIS, Spatial Analysis with Map Algebra, Stream and Catchment Delineation, Adding Open Data to Your Catchment, Calculating Percentage of Land Cover per Subcatchment, Map Design and Conclusion. The book is set up like a QGIS workflow with each section leading on from the next culminating in all the skills needed to create pleasing and functional map.

Each chapter begins with a workflow showing what will be done in a step-by-step fashion. These workflows are not QGIS-specific and could be executed in other software if needed, but the general logic and analysis required are outlined from the get-go which is useful for anyone improving their GIS skills. The exercises are written methodically, with an abundance of full-colour screenshots, and are easy to follow, particularly when paired with the videos on Hans van der Kwast's Youtube Channel.

See the QOD Book review session here: https://www.youtube.com/watch?v=YgNVQz4PegQ