Characterization and mapping of illegal landfill potential occurrence in the Canary Islands

摘要

The proliferation of illegal landfills (IL) has a negative impact, especially for ecologically sensitive areas orthose attractive for tourists. This research focuses on the drivers of the IL spatial distribution in archipe-lagic environments for mapping the IL potential occurrence. 286 and 153 illegal landfills localizationswere identified through fieldwork in the islands of Gran Canaria (GC) and La Palma (LP), respectively.The characterization of IL was carried out from a set of features (177) such as: waste type, control andsurveillance, socioeconomic, accessibility, distance to elements of interest, visibility and physiographic.Feature selection was performed using the Discriminant Analysis technique (DA). The DA model selected 10 and 9 features for GC and LP, respectively. The GC IL potential occurrence was mainly related to thegreenhouse density, type of cadastral plot and distance to the coast. For the case of LP, the following fea-tures were selected: population density, distance to natural protected areas, distance to urban areas,slope and Normalised Difference Vegetation Index (NDVI). Different potential illegal landfill occurrencemaps were obtained: (i) likelihood of occurrence of IL; and (ii) areas potentially affected by IL, basedon the application of ROC (Receiver Operating Characteristics) curves and success rate. ROC was equalto 0.973 and 0.979 in LP and GC, respectively. Success rate was equal to 81.58% considering an affectedarea of 21.95% in LP, whereas success rate was equal to 87.32% in GC considering 20.10% affected area. (C) 2019 Elsevier Ltd. All rights reserved.