Preliminary study on the correlation between GNSS ZTD and soil water content based on wavelet transform
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摘要: 利用2018年11月—2019年1月,大陆环境检测网络的NMEL站全球卫星导航系统天顶对流层延迟（GNSS ZTD）数据和中科院遥感与数字地球研究所闪电河流域土壤水分监测试验区的土壤水含量数据,借助小波变换的方法进行了月时间尺度的GNSS ZTD与土壤水含量的相关性分析研究．实验表明:在月时间尺度上,GNSS ZTD与土壤水含量存在相关性,GNSS ZTD经小波分解后的低频趋势项与土壤水含量相关性明显高于GNSS ZTD与土壤水含量的相关性,[JP2]分析认为，降水发生时GNSS ZTD升高因素会造成与土壤水含量相关性异常Abstract: Based on the data of GNSS ZTD of NMEL station of the CMONOC from November 2018 to January 2019 and the soil water content data of the Lightning River Basin Soil Moisture Detection Test Area of the Institute of Remote Sensing and Digital Earth of the Chinese Academy of Sciences, the correlation analysis between GNSS ZTD and soil water content on the monthly time scale are carried out by means of wavelet transform. The results show that GNSS ZTD is correlated with soil water content in monthly time scale, the correlation between GNSS ZTD and soil water content is significantly higher after wavelet decomposition, and the correlation between GNSS ZTD and soil water content is higher. The correlation between GNSS ZTD and soil water content is abnormal in short time, such as precipitation.
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Key words:
- soil water content /
- ZTD /
- correlation /
- wavelet transform /
- monthly scale analysis
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