Abstract
Abstract. The new data source of China’s civilian high resolution earth observation system ZY-3, GF-1 were applied in the application of the monitoring and protection of the inland-lakes in Wuhan, Hubei Province. After the pre-process of these high resolution satellite images, the object-oriented classification and object-oriented change detection technology were applied in the inland-lakes protection of Wuhan, China. In this paper, the Xiwanhu Lake and Tangxunhu Lake including their surrounding areas were selected as an example, with the experiments the status of these lakes including the lake boundary, lake area and the change of these lakes including the lake water surface increased area, lake water surface decreased area were be obtained. Compared with the pixel-based method, the object-oriented classification and change detection technology shows its intuitive and higher precision in inland-lake protection. Remote sensing technology should be applied in monitoring and protection the inland-lake and other respects of water resource management more widely and deeply in China.
Highlights
1.1 BackgroundWuhan is one of the mega cities in Central China
The Xiwanhu Lake and Tangxunhu Lake, these two lakes of Wuhan including their surrounding areas were selected as an example to show the inland-lakes protection application with high resolution satellite imagery including monitoring the boundary and morphology for each lake by using the remote sensing technology
The pre-process of ZY-3 and GF-1 satellite imagery contains the steps including unzip the raw data obtained from CRESDA (China Centre for Resources Satellite Data and Application), geometric correction/orthorectification with the RPC metadata file provided in the ZY-3/GF-1 raw imagery and the DEM file, radiation calibration with the calibration coefficient provide by CRESDA, image sharpening with the Gram-Schmidt pan sharpening algorithm by using the multispectral image with spatial resolution of 8 meter and the panchromatic image with spatial resolution of 2 meter (Jensen, 2004)
Summary
Wuhan is one of the mega cities in Central China. Wuhan is known as “the city with 100+ inland-lakes”, and currently there are 166 inland-lakes in Wuhan (Hu, 2013). The dynamic monitoring and the characteristic parameters of changes in lake’s area and boundary were be analyzed with multi-temporal remote sensing imagery. At the same time the Chinese government launched some highresolution civilian remote sensing satellites, including ZY-02C, ZY-3, GF-1, with highest spatial resolution in panchromatic band could reach up to 2 meter and the spatial resolution of multispectral bands could reach to 5-10 meter which provides an ideal data source for the protection of inland-lakes in Wuhan. The Xiwanhu Lake and Tangxunhu Lake, these two lakes of Wuhan including their surrounding areas were selected as an example to show the inland-lakes protection application with high resolution satellite imagery including monitoring the boundary and morphology for each lake by using the remote sensing technology. The satellite combined ground monitoring system by using the object-oriented classification technology, GPS technology, and information
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