Journal
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
Volume 11, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/ijgi11070397
Keywords
human activity; area extraction; large-scale spatial data; varying density; clustering algorithm
Funding
- National Key R&D Program of China [2019YFB2103102]
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This research proposes a novel area extraction framework (ELV) that tackles the challenge of varying densities of large-scale spatial data by using clustering with an adaptive distance parameter and a re-segmentation strategy with noise recovery. Compared with other algorithms, ELV showed better performance on real-life datasets and achieved a significant improvement in the Silhouette coefficient indicator.
Human activity area extraction, a popular research topic, refers to mining meaningful location clusters from raw activity data. However, varying densities of large-scale spatial data create a challenge for existing extraction methods. This research proposes a novel area extraction framework (ELV) aimed at tackling the challenge by using clustering with an adaptive distance parameter and a re-segmentation strategy with noise recovery. Firstly, a distance parameter was adaptively calculated to cluster high-density points, which can reduce the uncertainty introduced by human subjective factors. Secondly, the remaining points were assigned according to the spatial characteristics of the clustered points for a more reasonable judgment of noise points. Then, to face the varying density problem, a re-segmentation strategy was designed to segment the appropriate clusters into low- and high-density clusters. Lastly, the noise points produced in the re-segmentation step were recovered to reduce unnecessary noise. Compared with other algorithms, ELV showed better performance on real-life datasets and reached 0.42 on the Silhouette coefficient (SC) indicator, with an improvement of more than 16.67%. ELV ensures reliable clustering results, especially when the density differences of the activity points are large, and can be valuable in some applications, such as location prediction and recommendation.
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