Assessing Vulnerability: The Technology Behind the New CCAPS Climate Change Dashboard
The new climate dashboard – released by the Robert S. Strauss Center and Development Gateway – enables researchers to more easily explore and analyze climate security risks and insecurities across Africa.
A new climate dashboard – released by the Robert S. Strauss Center and Development Gateway – enablesresearchers to more easily explore and analyze climate security risks and insecurities across Africa. The innovative online platform utilizes a model developed by theStrauss Center’s Climate Change and African Political Stability (CCAPS) –the Climate Change Vulnerability Model – that analyzes where and how climate-related events could disrupt Africa’s security and development. Development Gateway also developed an interactive dashboard drawing upon the data used in creating the climate vulnerability model, enabling CCAPS to explain each step of how the model was built.
First, we re-created the vulnerability model in ArcMap 10.1 using Model Builder and the Map Algebra tool (Figure 1 below). The top four blue circles in Figure 1 are the basket layers in raster format and the bottom four circles are the weights for each basket. These are fed into the Map Algebra Raster Calculator tool (Figure 2 below), which generates the final composite raster layer using the expression below.
Figure 3. Client-side and server-side work flow process to create a user-defined vulnerability map. For example, the first map below (Figure 4) shows the vulnerability model with the CCAPS default weightings (25 Climate Hazard, 25 Population, 25 Household Resilience, 25 Governance), while the second map (Figure 5) displays the model with the revised weightings (40 Climate Hazard, 15 Population, 30 Household Resilience, and 15 Governance). As a result of these weighting changes, North Africa, Zambia and Zimbabwe are less vulnerable, most likely due to the reduced weighting of the governance variable.
Figure 4. Vulnerability map from the new CCAPS dashboard using default variable weights.
Figure 5. Vulnerability map from the new CCAPS dashboard using revised (user-adjusted) variable weights. Try your hand at using the interactive weighting, and let us know how your models compare with ours!