Fig. 2
From: A national-scale land cover reference dataset from local crowdsourcing initiatives in Indonesia
The crowdsourced non-expert LC annotation interface (in Indonesian) as a mobile application, made available at a dedicated local website (https://urundata.id/), which is based on the Picture Pile serious game available at https://geo-wiki.org/games/picturepile/. (a) The annotator was shown a VHR image chip (100-by-100 meters) with the question “Do you see <prior LC label, e.g., ‘Undisturbed Forest’> in more than half of the picture?”, which they then answered with “Yes” (swiping right), “No” (swiping left), or “Not Sure” (“Maybe”) (swiping down). The date of the image, the text stating the location (province, district, regency) of the sample, and a scale bar were shown. (b) Clicking the “zoom out” icon at the bottom right in (a) opens the image view of the larger-area (400-by-400 meters). (c) In the beginning the annotator went through example items with explanations. (d) When annotating a randomly shown control sample (image), the annotator received feedback regarding whether their answer was correct, and they were given a bonus point or a penalty accordingly.
