Article(id=1281933726632358241, tenantId=1146029695717560320, journalId=1281212831689347082, issueId=1281909275651969257, articleNumber=null, orderNo=null, doi=10.14075/j.jgg.2025.10.334, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1760112000000, receivedDateStr=2025-10-11, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1783566417606, onlineDateStr=2026-07-09, pubDate=1781452800000, pubDateStr=2026-06-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1783566417606, onlineIssueDateStr=2026-07-09, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1783566417606, creator=13701087609, updateTime=1783566417606, updator=13701087609, issue=Issue{id=1281909275651969257, tenantId=1146029695717560320, journalId=1281212831689347082, year='2026', volume='46', issue='6', pageStart='662', pageEnd='789', issueExtLink='null', onlineDate='null', pubDate='1781452800000', pubDateStr='2026-06-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1783560588038, creator='13701087609', updateTime=1783566454347, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1281933881221812905, tenantId=1146029695717560320, journalId=1281212831689347082, issueId=1281909275651969257, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1281933881221812906, tenantId=1146029695717560320, journalId=1281212831689347082, issueId=1281909275651969257, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=758, endPage=764, ext={EN=ArticleExt(id=1281933726842073442, articleId=1281933726632358241, tenantId=1146029695717560320, journalId=1281212831689347082, language=EN, title=Spaceborne GNSS-R Flood Dynamics Monitoring Based on POBI Interpolation Rate Variation: Taking the Major Flood Disaster in Guilin in 2024 as an Example, columnId=null, journalTitle=Journal of Geodesy and Geodynamics, columnName=null, runingTitle=null, highlight=null, articleAbstract=
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 constructed 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.
, authors=Lilong LIU
1, Hongwei ZHANG
1, Fade CHEN
1, *, Taotao YUAN
1, authorsList=Lilong LIU, Hongwei ZHANG, Fade CHEN, Taotao YUAN, authorCompany=null, correspAuthors=Fade CHEN, authorNote=null, correspAuthorsNote=null, copyrightStatement=
All rights reserved. Unauthorized reproduction is prohibited., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1281933730482729334, articleId=1281933726632358241, tenantId=1146029695717560320, journalId=1281212831689347082, language=CN, title=基于POBI插值变化率的星载GNSS-R洪水动态监测——以桂林市2024年重大洪涝灾害为例, columnId=1281933726917570915, journalTitle=大地测量与地球动力学, columnName=特色栏目:地震大地测量学, runingTitle=null, highlight=null, articleAbstract=
针对星载GNSS-R技术在大尺度洪水淹没范围图中引入插值导致准确性降低和单一水体误判的问题, 本文提出一种基于历史同期观测插值(POBI)反射率变化率的动态监测方法。利用2019-2023年雨季CYGNSS反射率数据与中国1 km分辨率月降雨量产品, 构建POBI空间插值模型, 并结合双基雷达公式反演地表反射率, 系统分析桂林市2024-06极端降雨事件中的洪水演进过程。结果表明, 在未采样区域的反射率插值中, RMSE较自然邻近法平均降低20.98%;基于变化率的淹没识别机制有效规避了传统阈值法的主观性, 监测结果显示, 市中心城区在06-19的淹没面积较06-12扩大48.68%, 空间演变与SMAP土壤湿度变化高度一致。该研究为星载GNSS-R在高动态、低覆盖率区域的洪水精细化监测提供了可靠的方法支撑。
, authors=刘立龙
1, 张宏伟
1, 陈发德
1, *, 原涛涛
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版权所有,未经授权,不得转载。, copyrightOwner=大地测量与地球动力学编辑部, extLink=null, articleAbsUrl=null, sourceXml=7xltyHWl5kPaKFwOcdgMXA==, magXml=LaJJJN0xrFKgw9S1DSFMyg==, pdfUrl=null, pdf=eNti91AfGUoW+AEot4rK1w==, pdfFileSize=4385110, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=HhsURIiVmML5CvvCjzpLYA==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=ZGLw941FbUw/9Z5kfdYN0w==, mapNumber=null, fund=null)}, authors=[Author(id=1281933730805690747, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=hn_liulilong@163.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1281933730881188221, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, authorId=1281933730805690747, language=EN, stringName=Lilong LIU, firstName=Lilong, middleName=null, lastName=LIU, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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刘立龙, 博士, 教授, 博士生导师, 主要从事GNSS技术及应用研究, E-mail: hn_liulilong@163.com
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刘立龙, 博士, 教授, 博士生导师, 主要从事GNSS技术及应用研究, E-mail: hn_liulilong@163.com
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Single-day reflectance distribution in Guilin, figureFileSmall=ht1mo1JvegNkYiYwVax5Fg==, figureFileBig=HhsURIiVmML5CvvCjzpLYA==, tableContent=null), ArticleFig(id=1281933736107291031, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=CN, label=图1, caption=
桂林市单日反射率数据分布 桂林市界线来源于审图号GS(2024)0650号标准地图,无修改。文中其他图件同此
, figureFileSmall=ht1mo1JvegNkYiYwVax5Fg==, figureFileBig=HhsURIiVmML5CvvCjzpLYA==, tableContent=null), ArticleFig(id=1281933739362070936, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=EN, label=Fig. 2, caption=
Monthly precipitation variations in Guilin from 2019 to 2023, figureFileSmall=3eRWc84Z6eSdKzp8z0FB/A==, figureFileBig=GHJtHw9KfNfh9SBKnXKcFw==, tableContent=null), ArticleFig(id=1281933739852804505, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=CN, label=图2, caption=
2019—2023年桂林市月降雨量变化, figureFileSmall=3eRWc84Z6eSdKzp8z0FB/A==, figureFileBig=GHJtHw9KfNfh9SBKnXKcFw==, tableContent=null), ArticleFig(id=1281933740356120986, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=EN, label=Fig. 3, caption=
Comparison of different model errors, figureFileSmall=s691unI8yaquBFpiLGwaxg==, figureFileBig=FeZ/XZbTCESUvcHJ+kdxEg==, tableContent=null), ArticleFig(id=1281933741132067227, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=CN, label=图3, caption=
不同模型误差对比, figureFileSmall=s691unI8yaquBFpiLGwaxg==, figureFileBig=FeZ/XZbTCESUvcHJ+kdxEg==, tableContent=null), ArticleFig(id=1281933742327443869, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=EN, label=Fig. 4, caption=
Comparison of interpolation effects among different interpolation methods, figureFileSmall=Zx3qpcbgKSKW9C83mPAeSw==, figureFileBig=lvVQd+JAa+b3AytU2fJz2w==, tableContent=null), ArticleFig(id=1281933742742679966, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=CN, label=图4, caption=
不同插值方法差值效果对比, figureFileSmall=Zx3qpcbgKSKW9C83mPAeSw==, figureFileBig=lvVQd+JAa+b3AytU2fJz2w==, tableContent=null), ArticleFig(id=1281933743157916063, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=EN, label=Fig. 5, caption=
Changes in the growth rate of high-reflectivity grids in Guilin, figureFileSmall=4ithLOPTp6STfiAEou+bXQ==, figureFileBig=tTXsVS3rII2Awd4vZVP6xA==, tableContent=null), ArticleFig(id=1281933743988388256, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=CN, label=图5, caption=
桂林市高反射率网格增长率变化, figureFileSmall=4ithLOPTp6STfiAEou+bXQ==, figureFileBig=tTXsVS3rII2Awd4vZVP6xA==, tableContent=null), ArticleFig(id=1281933744135188897, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=EN, label=Fig. 6, caption=
Interpolated results of reflectance in Guilin from June 9 to 22, 2024, figureFileSmall=WobCt4qtIclg0h9Nvci6Zw==, figureFileBig=TqAkNjESDKpXspZ8Fz0z2Q==, tableContent=null), ArticleFig(id=1281933744864997794, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=CN, label=图6, caption=
桂林市反射率插值结果(2024-06-09—22), figureFileSmall=WobCt4qtIclg0h9Nvci6Zw==, figureFileBig=TqAkNjESDKpXspZ8Fz0z2Q==, tableContent=null), ArticleFig(id=1281933745443811748, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=EN, label=Fig. 7, caption=
Changes in flood inundation in Guilin from June 9 to 22, 2024, figureFileSmall=DcSxBmd5RfggoRnSJCaO8w==, figureFileBig=cttf/sPpbaaZ3p/r5W+VzA==, tableContent=null), ArticleFig(id=1281933747377385893, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=CN, label=图7, caption=
桂林市洪水淹没变化(2024-06-09—22), figureFileSmall=DcSxBmd5RfggoRnSJCaO8w==, figureFileBig=cttf/sPpbaaZ3p/r5W+VzA==, tableContent=null), ArticleFig(id=1281933747478049190, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=EN, label=Fig. 8, caption=
Changes in flood inundation in Guilin before and after the June 2024 heavy rainfall, figureFileSmall=ddAc8Lins/CKjWofGXIqJA==, figureFileBig=4A5MUdrytpiJrUlGpmxvIA==, tableContent=null), ArticleFig(id=1281933747801010599, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=CN, label=图8, caption=
2024-06桂林市强降雨前后洪水淹没变化, figureFileSmall=ddAc8Lins/CKjWofGXIqJA==, figureFileBig=4A5MUdrytpiJrUlGpmxvIA==, tableContent=null), ArticleFig(id=1281933747868119464, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=EN, label=Fig. 9, caption=
Soil moisture changes in Guilin from June 9 to 22, 2024, figureFileSmall=dXtBiyPOhBO9Tx900kqIWg==, figureFileBig=nCU5uDxXGLaCa3ZjXFV8gQ==, tableContent=null), ArticleFig(id=1281933748585345449, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1281933726632358241, language=CN, label=图9, caption=
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