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Geographical characteristics of China’s wetlands derived from remotely sensed data

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Abstract

In this paper, we report the first wetland mapping of the entire China using Landsat enhanced thematic mapper plus (ETM+) data. These data were obtained from the Global Land Cover Facility at the University of Maryland spanning from 1999 to 2002. A total of 597 scenes of Landsat images were georeferenced and mosaiced. Manual image interpretation of satellite images was aided with elevation data, soil data, land cover/land use data and Google Earth. The minimum mapping unit is 10 pixel × 10 pixel, equivalent to 9 ha. The aim of our first round of mapping was only targeted at the boundary delineation of any type of wetland except those wetlands that are under agricultural use (i.e., paddy fields), which has already been well mapped by others. Our interpretation results indicate that a total of 359478 km2 of wetlands are of non-agricultural use. Among our preliminarily mapped wetland, 339353 km2 are inland wetland, 2786 km2 are non-agricultural artificial wetland, and 17609 km2 are coastal wetland. Because low-tide is rarely captured in satellite images, an under-estimation of coastal wetland is inevitable. We conducted some statistics based on our mapped wetlands and compared them with those previously obtained from a number of sources including a land cover/land use map made with satellite images during the late 1990s and early 2000s, a marshland map developed in approximately the same period, survey data of coastal wetland in early 1980s, and area data for approximately 400 larger patches of marshland in China compiled in 1996. Because some inconsistencies exist in the guidelines of those different wetland surveys, difference in area is expected. Some further comparison indicates that the wetland distributions derived from the preliminary wetland map are reasonable and more objective than other sources. The mapping process also indicated that the method adopted by us was efficient and cost-effective. We also found that in order to ensure comparability of the wetland maps developed at different times, a set of standard guidelines on the wetland categories to be mapped, and the mapping methods to be used must be well conceived, developed and effectively employed. We carried out some initial geographical analysis on the distribution of wetlands.

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Authors and Affiliations

  1. State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Institute of Remote Sensing Applications, Chinese Academy of Sciences, and Beijing Normal University, Beijing, 100101, China

    ZhenGuo Niu, Peng Gong, Xiao Cheng, JianHong Guo, Lin Wang, HuaBing Huang, ShaoQing Shen, YunZhao Wu, XiaoFeng Wang, XianWei Wang, Qing Ying, Lu Liang, LiNa Zhang, Lei Wang, Qian Yao, ZhenZhong Yang & ZiQi Guo

  2. School of Geography, Beijing Normal University, Beijing, 100875, China

    YongJiu Dai

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  1. ZhenGuo Niu
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  2. Peng Gong
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  3. Xiao Cheng
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  5. Lin Wang
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Corresponding author

Correspondence to Peng Gong.

Additional information

Supported by National High-Tech Research and Development Plan (Grant No. 2006AA12Z112) and the National Science & Technology Pillar Program (Grant No. 2006BAJ10B02)

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Niu, Z., Gong, P., Cheng, X. et al. Geographical characteristics of China’s wetlands derived from remotely sensed data. Sci. China Ser. D-Earth Sci. 52, 723–738 (2009). https://doi.org/10.1007/s11430-009-0075-2

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  • DOI: https://doi.org/10.1007/s11430-009-0075-2

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