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Identification of Urban Functional Areas by Coupling Satellite Images and Taxi GPS Trajectories
- Source :
- Remote Sensing, Vol 12, Iss 2449, p 2449 (2020), Remote Sensing; Volume 12; Issue 15; Pages: 2449
- Publication Year :
- 2020
- Publisher :
- MDPI AG, 2020.
-
Abstract
- Urban functional area (UFA) recognition is one of the most important strategies for achieving sustainable city development. As remote-sensing and social-sensing data sources have increasingly become available, UFA recognition has received a significant amount of attention. Research on UFA recognition that uses a single dataset suffers from a low update frequency or low spatial resolution, while data fusion-based methods are limited in efficiency and accuracy. This paper proposes an integrated model to identify UFA using satellite images and taxi global positioning system (GPS) trajectories in four steps. First, blocks were generated as spatial units in the study area, and the spatiotemporal information entropy of the taxi GPS trajectory (STET) for each block was calculated. Second, a 24-hour time-frequency series was formed based on the pick-up and drop-off points extracted from taxi trajectories and used as the interpretation indicator of the blocks. The K-Means++ and k-Nearest Neighbor (kNN) algorithm were used to identify their social functions. Third, a multilabel classification method based on the residual neural network (MLC-ResNets) and “You Only Look Once” (YOLO) target detection algorithms were used to identify the features of the typical and atypical spatial textures, respectively, of the satellite images in the blocks. The confidence scores of the features of the blocks were categorized by the decision tree algorithm. Fourth, to find the best way to integrate the two sub-models for UFA identification, the 10-fold cross-validation method based on stratified random sampling was applied to determine the most optimal STET thresholds. The results showed that the average accuracy reached 82.0%, with an average kappa of 73.5%—significant improvements over most existing studies. This paper provides new insights into how the advantages of satellite images and taxi trajectories in UFA identification can be fully exploited to support sustainable city management.
- Subjects :
- business.industry
Computer science
Science
0211 other engineering and technologies
Pattern recognition
02 engineering and technology
Sensor fusion
urban function areas
taxi trajectory
Identification (information)
remote sensing
machine learning
Coupling (computer programming)
0202 electrical engineering, electronic engineering, information engineering
Global Positioning System
General Earth and Planetary Sciences
020201 artificial intelligence & image processing
Satellite
Artificial intelligence
business
Image resolution
021101 geological & geomatics engineering
Block (data storage)
Subjects
Details
- Language :
- English
- ISSN :
- 20724292
- Volume :
- 12
- Issue :
- 2449
- Database :
- OpenAIRE
- Journal :
- Remote Sensing
- Accession number :
- edsair.doi.dedup.....6313637bdebeebc62133e4df99988fb4