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  <Title>Illegal Dumping Susceptibility in Keur Massar Senegal in 2025 (weighted)</Title>
  <Abstract>This map shows the weighted illegal dumping susceptibility across the three communes of Keur Massar (Malika, Keur Massar, and Yeumbeul Nord) in Dakar, Senegal. The map was produced in 2025 as part of a research project using multi-criteria analysis at UNEP/GRID Geneva.

The map represents a weighted combination of several positively correlated criteria with illegal dumping: proximity to water edges, vegetation areas, bare soil areas, population density (2025), land surface temperature, market areas, areas around PRNs, and a social perception criterion derived from a survey of students living in the three communes. Waste collection routes, which are negatively correlated with illegal dumping, are also included.

Weights for each criterion were determined using the Analytic Hierarchy Process (AHP). The relative importance of the criteria was established based on the student surveys and scientific literature. A pairwise comparison matrix was then created to calculate the weights. Each criterion raster was multiplied by its corresponding weight, and the weighted rasters were summed to produce the final map.

All criteria were rasterized when necessary and normalized before weighting. The Focal Statistics tool was applied with a radius of 7 pixels to smooth the results and reduce local noise.

The susceptibility levels are visualized using a color scale: dark green (very low, ≤ 0.19), light green (low, ≤ 0.24), beige (medium, ≤ 0.27), orange (high, ≤ 0.31), and red (very high, ≤ 0.42). This output provides a comprehensive overview of spatial susceptibility patterns for illegal dumping, supporting targeted interventions and planning.</Abstract>
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