大地测量与地球动力学2026，Vol.46Issue(6)：758-764,7.DOI:10.14075/j.jgg.2025.10.334
基于POBI插值变化率的星载GNSS-R洪水动态监测
Spaceborne GNSS-R Flood Dynamics Monitoring Based on POBI Interpolation Rate Variation:Taking the Major Flood Disaster in Guilin in 2024 as an Example
摘要
Abstract
To address the issues of reduced accuracy and misidentification of single water bodies caused by interpolation in large-scale flood inundation mapping using spaceborne GNSS-R technology,this paper proposes a dynamic monitoring method based on the reflectivity change rate using period-matched observation-based interpolation(POBI).Utilizing CYGNSS reflectivity data during the rainy seasons from 2019 to 2023 and China's 1 km resolution monthly precipitation products,we construc-ted a POBI spatial interpolation model.By combining this with the bistatic radar equation to retrieve surface reflectivity,we systematically analyzed the flood evolution process during the extreme rainfall event in Guilin in June 2024.The results show that,for reflectivity interpolation in unsampled areas,the root mean square error(RMSE)decreased by an average of 20.98％compared to the natural neighbor method.The inundation identification mechanism based on the change rate effectively avoids the subjectivity of traditional threshold methods.The monitoring results indicate that the inundated area in the central urban district expanded by 48.68％from June 19 to June 12,with spatial evolution highly consistent with changes in SMAP soil moisture.This study provides reliable methodological support for refined flood monitoring in highly dynamic,low-coverage areas using spaceborne GNSS-R.关键词
星载GNSS-R/CYGNSS/洪水监测/POBIKey words
spaceborne GNSS-R/CYGNSS/flood monitoring/POBI分类
天文与地球科学引用本文复制引用
刘立龙,张宏伟,陈发德,原涛涛..基于POBI插值变化率的星载GNSS-R洪水动态监测[J].大地测量与地球动力学,2026,46(6):758-764,7.基金项目
广西科技基地与人才专项(桂科AD25069064) （桂科AD25069064）
广西自然科学基金(2024GXNSFDA010041) （2024GXNSFDA010041）
国家自然科学基金(42504052). （42504052）
