Fig. 3
From: Quality control in public participation assessments of water quality: the OPAL Water Survey
Comparison between pond health scores for two experienced surveyors. a At all lakes, all sampling locations, all sweep times (N = 210); b all lakes; all sampling locations within a lake (N = 70); c all lakes (N = 7). Red and green lines represent the poor and good thresholds for OPAL Water Survey health scores respectively. Hence, scores within the boxes along the diagonal represent surveyor ‘agreement’ within the OPAL three-tier system