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Synergistic use of optical and InSAR data for urban impervious surface mapping: A case study in Hong Kong

International Journal of Remote Sensing

By:
, , ,
DOI: 10.1080/01431160802555838

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Abstract

A wide range of urban ecosystem studies, including urban hydrology, urban climate, land use planning and watershed resource management, require accurate and up-to-date geospatial data of urban impervious surfaces. In this study, the potential of the synergistic use of optical and InSAR data in urban impervious surface mapping at the sub-pixel level was investigated. A case study in Hong Kong was conducted for this purpose by applying a classification and regression tree (CART) algorithm to SPOT 5 multispectral imagery and ERS-2 SAR data. Validated by reference data derived from high-resolution colour-infrared (CIR) aerial photographs, our results show that the addition of InSAR feature information can improve the estimation of impervious surface percentage (ISP) in comparison with using SPOT imagery alone. The improvement is especially notable in separating urban impervious surface from the vacant land/bare ground, which has been a difficult task in ISP modelling with optical remote sensing data. In addition, the results demonstrate the potential to map urban impervious surface by using InSAR data alone. This allows frequent monitoring of world's cities located in cloud-prone and rainy areas. ?? 2009 Taylor & Francis.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Synergistic use of optical and InSAR data for urban impervious surface mapping: A case study in Hong Kong
Series title:
International Journal of Remote Sensing
DOI:
10.1080/01431160802555838
Volume
30
Issue:
11
Year Published:
2009
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
2781
Last page:
2796
Number of Pages:
16