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This study examines this problem in the con text of humanitarian mapping initiatives coordinated using the Humanitarian OpenStreetMap Team Tasking Manager, analyzing 4619 projects and over 1.4 million microtasks. Using a combination of spatial statistical techniques and expert visual inspection, we identify two main issues derived from microtask aggregation: edge\u2010based and task\u2010wide distortions. Our findings reveal that the current microtasking model hinders the emergence of spatial collective intelli gence, resulting in fragmented and inconsistent outputs that reduce the quality of the final data. Edge\u2010based issues are identified by observing differences in event distribution between edge and interior areas. Task\u2010wide issues are examined by computing the spatial autocorrelation of geometries within microtask areas. We propose actionable strategies to address these issues, including overlapping task boundaries and fostering implicit coordination among contributors.<\/jats:p>","DOI":"10.1111\/tgis.70288","type":"journal-article","created":{"date-parts":[[2026,5,23]],"date-time":"2026-05-23T07:36:26Z","timestamp":1779521786000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Quality Issues in Crowdsourced Mapping: Microtask Aggregation in the Humanitarian\n                    <scp>OpenStreetMap<\/scp>\n                    Team Tasking Manager"],"prefix":"10.1111","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6477-0683","authenticated-orcid":false,"given":"H\u00e9ctor","family":"Ochoa\u2010Ortiz","sequence":"first","affiliation":[{"name":"Computer Science Division, School of Science and Technology Universit\u00e0 Degli Studi di Camerino  Camerino MC Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8000-628X","authenticated-orcid":false,"given":"Dagoberto Jos\u00e9","family":"Herrera\u2010Murillo","sequence":"additional","affiliation":[{"name":"Aragon Institute of Engineering Research (I3A) Universidad de Zaragoza  Zaragoza Arag\u00f3n Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5374-2364","authenticated-orcid":false,"given":"Barbara","family":"Re","sequence":"additional","affiliation":[{"name":"Computer Science Division, School of Science and Technology Universit\u00e0 Degli Studi di Camerino  Camerino MC Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6491-7430","authenticated-orcid":false,"given":"Francisco J.","family":"Lopez\u2010Pellicer","sequence":"additional","affiliation":[{"name":"Aragon Institute of Engineering Research (I3A) Universidad de Zaragoza  Zaragoza Arag\u00f3n Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1279-0367","authenticated-orcid":false,"given":"Javier","family":"Nogueras\u2010Iso","sequence":"additional","affiliation":[{"name":"Aragon Institute of Engineering Research (I3A) Universidad de Zaragoza  Zaragoza Arag\u00f3n Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,5,23]]},"reference":[{"key":"e_1_2_13_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/HICSS.2016.675"},{"key":"e_1_2_13_3_1","doi-asserted-by":"publisher","DOI":"10.1145\/1866029.1866078"},{"key":"e_1_2_13_4_1","first-page":"57","volume-title":"Handbook of Collective Intelligence","author":"Bigham J. 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