A Producer-Led Product-Consistency Audit of an AHP Landslide-Susceptibility Raster: A Philippine Road-Corridor Case Study

An acceptable analytic hierarchy process (AHP) consistency ratio measures the coherence of pairwise judgement, not the integrity of a geographic information system (GIS) product. This study audits three relationships in a relative landslide-susceptibility index for the 22.14-km Villa Verde Road corridor, Pangasinan, Philippines: raster-pair and partition consistency, regenerated-overlay encoding and coverage, and factor-score rule consistency. Comparison of the retained slope surface with the former slope-score raster identified 12 cells incorrectly assigned score 4 despite slopes of 25.16°–29.69°. Correcting them changed 12 index values and, with re-derived class breaks, 20 class labels (0.85%). A separate aspect comparison found 1,167 of 2,357 cells (49.51%) differed between the retained raw-derived surface and adopted V1 scores; the raw-derived alternative changed 307 cells under fixed thresholds and 301 after re-derived Jenks breaks. Weight sensitivity tests produced up to 533 changed cells in one-at-a-time scenarios, while mean Dirichlet agreement ranged from 75.43% to 87.27%; Very High-class Jaccard overlap was lower (0.60–0.77). These first-party checks and conditional sensitivity results do not constitute independent workflow, source-data or predictive validation. The derivative-processing cause and intended aspect convention remain unresolved; principal results are conditional on V1.