Fig. 1From: Heuristics for spatial finding using iterative mobile crowdsourcingA test scenario with RSC-NR, and the observed regions after finding \(k = 20\) positive regions. a Test Scenario: 1600 regions, the number of ‘0’s is 1268 (79.25 %); the number of ‘1’s is 332 (20.75 %). b Observed regions from RSC-NR; after 73 questions, nine roundsBack to article page