Journal
LANDSCAPE ECOLOGY
Volume 36, Issue 7, Pages 1845-1861Publisher
SPRINGER
DOI: 10.1007/s10980-020-01104-7
Keywords
Spatial heterogeneity; Land cover change; Remote sensing; Change detection; Frequency; Time of change
Funding
- National Natural Science Foundation of China [41801178, 41771203]
- Chinese Academy of Sciences [XDA23030102]
- Shenzhen Municipal Ecology and Environment Bureau [SZCG2018161498]
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Urban landscapes are dynamic and changes occur frequently. The new approach can accurately and efficiently detect land cover changes, integrating object-based analysis and time-series change detection techniques to facilitate sustainable landscape planning.
Context Urban landscapes are highly dynamic with changes frequently occurring at short time intervals. Although the Landsat data archive allows the use of high-density time-series data to quantify such dynamics, the approaches that can fully address the spatial and temporal complexity of the urban landscape are still lacking. Objectives A new approach is presented for accurately quantifying urban landscape dynamics. Information regarding when and where a change occurs, what type of change exists, and how often it happens are incorporated. Methods The new approach integrates object-based image analysis and time-series change detection techniques by using all available Landsat images for several decades. This approach was tested on the rapidly urbanizing city of Shenzhen, China from 1986 to 2017. Results Land cover changes in both long- and short-time intervals can be proficiently detected with an overall accuracy of 90.65% and a user's accuracy of 92.18% and 82.40% for No change and Change, respectively. The frequency and time of change can be explicitly displayed while incorporating the advantages of object-based image analysis and time-series change detection. The efficiency of the change analysis can be greatly increased because the object-based analysis greatly reduces the number of analyzed units. Conclusion The new approach can accurately and efficiently detect the land cover change for quantifying urban landscape dynamics. Integrating the object and the remotely sensed time-series data has the potential to link the physical and socio-economic properties together for facilitating sustainable landscape planning.
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