Abstract
The Cropland Capture game (CCG) aims to map cultivated lands using around 170000 satellite images. The contribution of the paper is threefold: (a) we improve the quality of the CCG’s dataset, (b) we benchmark state-of-the-art algorithms designed for an aggregation of votes in a crowdsourcing-like setting and compare the results with machine learning algorithms, (c) we propose an explanation for surprisingly similar accuracy of all examined algorithms. To accomplish (a), we detect image duplicates using the perceptual hash function pHash. In addition, using a blur detection algorithm, we filter out unidentifiable images. In part (c), we suggest that if all workers are accurate, the task assignment in the dataset is highly irregular, then state-of-the-art algorithms perform on a par with Majority Voting. We increase the estimated consistency with expert opinions from 77% to 91% and up to 96% if we restrict our attention to images with more than 9 votes.
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Acknowledgments
This research was supported by Russian Science Foundation, grant no. 14-11-00109, and the EU-FP7 funded ERC CrowdLand project, grant no. 617754.
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Baklanov, A. et al. (2017). Vote Aggregation Techniques in the Geo-Wiki Crowdsourcing Game: A Case Study. In: Ignatov, D., et al. Analysis of Images, Social Networks and Texts. AIST 2016. Communications in Computer and Information Science, vol 661. Springer, Cham. https://doi.org/10.1007/978-3-319-52920-2_4
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DOI: https://doi.org/10.1007/978-3-319-52920-2_4
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