Full
WANG Yong, PhD, professor, majors in GNSS meteorology, E-mail: wangyongjz@126.com
Outline
Time series InSAR deformation may be affected by the atmospheric residual effects caused by seasonal differences and weather changes(such as precipitation and snowfall), thereby reducing its accuracy. Taking Tianjin city as an example, we conduct research on the atmospheric residual effects and their correction of time series InSAR deformation. First, the SBAS-InSAR technique was used to process Sentinel-1A images to obtain time series InSAR deformation. Then, the time series InSAR deformation was compared with precise leveling measurement results, and the atmospheric residual effects in time series InSAR deformation were analyzed combining with seasonal and weather change characteristics. Finally, an atmospheric residual error model was constructed based on ERA5 PWV data, which was used to remove the atmospheric residual effect errors to optimize the time series InSAR deformation. The results show that time series InSAR deformation has atmospheric residual effect errors, especially those caused by weather changes such as precipitation, which is more pronounced and affect the accuracy of time series InSAR deformation. There is a significant negative correlation between the difference of monthly time series InSAR deformation and monthly precise leveling deformation and the PWV changes in the same period. The atmospheric residual effect correction model constructed using the linear regression method can effectively improve the accuracy of time series InSAR deformation.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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