{"id":"https://openalex.org/W3205091442","doi":"https://doi.org/10.1109/igarss47720.2021.9554005","title":"Quasi-Global GNSS-R Soil Moisture Retrievals at High Spatio-Temporal Resolution from Cygnss and Smap Data","display_name":"Quasi-Global GNSS-R Soil Moisture Retrievals at High Spatio-Temporal Resolution from Cygnss and Smap Data","publication_year":2021,"publication_date":"2021-07-11","ids":{"openalex":"https://openalex.org/W3205091442","doi":"https://doi.org/10.1109/igarss47720.2021.9554005","mag":"3205091442"},"language":"en","primary_location":{"id":"doi:10.1109/igarss47720.2021.9554005","is_oa":false,"landing_page_url":"https://doi.org/10.1109/igarss47720.2021.9554005","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS","raw_type":"proceedings-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5091271727","display_name":"Fangni Lei","orcid":"https://orcid.org/0000-0002-0201-7717"},"institutions":[{"id":"https://openalex.org/I99041443","display_name":"Mississippi State University","ror":"https://ror.org/0432jq872","country_code":"US","type":"education","lineage":["https://openalex.org/I4210141039","https://openalex.org/I99041443"]}],"countries":["US"],"is_corresponding":true,"raw_author_name":"Fangni Lei","raw_affiliation_strings":["Mississippi State University, Mississippi State, MS, USA"],"affiliations":[{"raw_affiliation_string":"Mississippi State University, Mississippi State, MS, USA","institution_ids":["https://openalex.org/I99041443"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5034104279","display_name":"Volkan Senyurek","orcid":"https://orcid.org/0000-0003-4446-4977"},"institutions":[{"id":"https://openalex.org/I99041443","display_name":"Mississippi State University","ror":"https://ror.org/0432jq872","country_code":"US","type":"education","lineage":["https://openalex.org/I4210141039","https://openalex.org/I99041443"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Volkan Senyurek","raw_affiliation_strings":["Mississippi State University, Mississippi State, MS, USA"],"affiliations":[{"raw_affiliation_string":"Mississippi State University, Mississippi State, MS, USA","institution_ids":["https://openalex.org/I99041443"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5065532859","display_name":"Mehmet Kurum","orcid":"https://orcid.org/0000-0002-5750-9014"},"institutions":[{"id":"https://openalex.org/I99041443","display_name":"Mississippi State University","ror":"https://ror.org/0432jq872","country_code":"US","type":"education","lineage":["https://openalex.org/I4210141039","https://openalex.org/I99041443"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Mehmet Kurum","raw_affiliation_strings":["Mississippi State University, Mississippi State, MS, USA"],"affiliations":[{"raw_affiliation_string":"Mississippi State University, Mississippi State, MS, USA","institution_ids":["https://openalex.org/I99041443"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5036752295","display_name":"Ali Cafer G\u00fcrb\u00fcz","orcid":"https://orcid.org/0000-0001-8923-0299"},"institutions":[{"id":"https://openalex.org/I99041443","display_name":"Mississippi State University","ror":"https://ror.org/0432jq872","country_code":"US","type":"education","lineage":["https://openalex.org/I4210141039","https://openalex.org/I99041443"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Ali Gurbuz","raw_affiliation_strings":["Mississippi State University, Mississippi State, MS, USA"],"affiliations":[{"raw_affiliation_string":"Mississippi State University, Mississippi State, MS, USA","institution_ids":["https://openalex.org/I99041443"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5000389436","display_name":"Dylan Boyd","orcid":"https://orcid.org/0000-0002-1110-2454"},"institutions":[{"id":"https://openalex.org/I99041443","display_name":"Mississippi State University","ror":"https://ror.org/0432jq872","country_code":"US","type":"education","lineage":["https://openalex.org/I4210141039","https://openalex.org/I99041443"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Dylan Boyd","raw_affiliation_strings":["Mississippi State University, Mississippi State, MS, USA"],"affiliations":[{"raw_affiliation_string":"Mississippi State University, Mississippi State, MS, USA","institution_ids":["https://openalex.org/I99041443"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5056355204","display_name":"Robert Moorhead","orcid":"https://orcid.org/0000-0002-4642-7873"},"institutions":[{"id":"https://openalex.org/I99041443","display_name":"Mississippi State University","ror":"https://ror.org/0432jq872","country_code":"US","type":"education","lineage":["https://openalex.org/I4210141039","https://openalex.org/I99041443"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Robert Moorhead","raw_affiliation_strings":["Mississippi State University, Mississippi State, MS, USA"],"affiliations":[{"raw_affiliation_string":"Mississippi State University, Mississippi State, MS, USA","institution_ids":["https://openalex.org/I99041443"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":6,"corresponding_author_ids":["https://openalex.org/A5091271727"],"corresponding_institution_ids":["https://openalex.org/I99041443"],"apc_list":null,"apc_paid":null,"fwci":0.456,"has_fulltext":false,"cited_by_count":8,"citation_normalized_percentile":{"value":0.59581522,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":99},"biblio":{"volume":null,"issue":null,"first_page":"6303","last_page":"6306"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11312","display_name":"Soil Moisture and Remote Sensing","score":1.0,"subfield":{"id":"https://openalex.org/subfields/2305","display_name":"Environmental Engineering"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11312","display_name":"Soil Moisture and Remote Sensing","score":1.0,"subfield":{"id":"https://openalex.org/subfields/2305","display_name":"Environmental Engineering"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11234","display_name":"Precipitation Measurement and Analysis","score":0.9966999888420105,"subfield":{"id":"https://openalex.org/subfields/1902","display_name":"Atmospheric Science"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10801","display_name":"Synthetic Aperture Radar (SAR) Applications and Techniques","score":0.9750000238418579,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/gnss-applications","display_name":"GNSS applications","score":0.7298154830932617},{"id":"https://openalex.org/keywords/environmental-science","display_name":"Environmental science","score":0.5872685313224792},{"id":"https://openalex.org/keywords/satellite","display_name":"Satellite","score":0.57274329662323},{"id":"https://openalex.org/keywords/remote-sensing","display_name":"Remote sensing","score":0.550468385219574},{"id":"https://openalex.org/keywords/satellite-system","display_name":"Satellite system","score":0.5122279524803162},{"id":"https://openalex.org/keywords/water-content","display_name":"Water content","score":0.5058081150054932},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.4069351553916931},{"id":"https://openalex.org/keywords/meteorology","display_name":"Meteorology","score":0.36408352851867676},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.17858248949050903},{"id":"https://openalex.org/keywords/geography","display_name":"Geography","score":0.13616490364074707},{"id":"https://openalex.org/keywords/geology","display_name":"Geology","score":0.12164965271949768}],"concepts":[{"id":"https://openalex.org/C14279187","wikidata":"https://www.wikidata.org/wiki/Q5514012","display_name":"GNSS applications","level":3,"score":0.7298154830932617},{"id":"https://openalex.org/C39432304","wikidata":"https://www.wikidata.org/wiki/Q188847","display_name":"Environmental science","level":0,"score":0.5872685313224792},{"id":"https://openalex.org/C19269812","wikidata":"https://www.wikidata.org/wiki/Q26540","display_name":"Satellite","level":2,"score":0.57274329662323},{"id":"https://openalex.org/C62649853","wikidata":"https://www.wikidata.org/wiki/Q199687","display_name":"Remote sensing","level":1,"score":0.550468385219574},{"id":"https://openalex.org/C2778027091","wikidata":"https://www.wikidata.org/wiki/Q25346003","display_name":"Satellite system","level":4,"score":0.5122279524803162},{"id":"https://openalex.org/C24939127","wikidata":"https://www.wikidata.org/wiki/Q373499","display_name":"Water content","level":2,"score":0.5058081150054932},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.4069351553916931},{"id":"https://openalex.org/C153294291","wikidata":"https://www.wikidata.org/wiki/Q25261","display_name":"Meteorology","level":1,"score":0.36408352851867676},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.17858248949050903},{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.13616490364074707},{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.12164965271949768},{"id":"https://openalex.org/C187320778","wikidata":"https://www.wikidata.org/wiki/Q1349130","display_name":"Geotechnical engineering","level":1,"score":0.0},{"id":"https://openalex.org/C1276947","wikidata":"https://www.wikidata.org/wiki/Q333","display_name":"Astronomy","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/igarss47720.2021.9554005","is_oa":false,"landing_page_url":"https://doi.org/10.1109/igarss47720.2021.9554005","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/15","score":0.46000000834465027,"display_name":"Life in Land"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":8,"referenced_works":["https://openalex.org/W2039348932","https://openalex.org/W2802220396","https://openalex.org/W2807220393","https://openalex.org/W2886854197","https://openalex.org/W2944709770","https://openalex.org/W2978354175","https://openalex.org/W3015987273","https://openalex.org/W3095275538"],"related_works":["https://openalex.org/W2606296569","https://openalex.org/W2375040471","https://openalex.org/W2068158190","https://openalex.org/W2916802843","https://openalex.org/W2064660797","https://openalex.org/W4387714868","https://openalex.org/W2071552392","https://openalex.org/W20579766","https://openalex.org/W2601478304","https://openalex.org/W4396749081"],"abstract_inverted_index":{"Global":[0,56],"soil":[1,31,74,103,118,222,243],"moisture":[2,32,119,223,244],"mapping":[3],"at":[4,34,62],"high":[5],"spatial":[6,36],"and":[7,17,42,87,101,132,176,189],"temporal":[8],"resolution":[9,37],"is":[10,113,161,224],"important":[11],"for":[12,186,258],"its":[13],"related":[14],"meteorological,":[15],"hydrological,":[16],"agricultural":[18],"applications.":[19],"Using":[20],"the":[21,53,88,99,140,145,158,209,217,236,248],"L-band":[22,63],"signals,":[23],"several":[24,126],"satellite-based":[25],"microwave":[26],"sensors":[27],"are":[28,79,130,252],"providing":[29],"global":[30,187,242],"retrievals":[33],"a":[35,43,108,255],"of":[38,46,68,91,157,166,208,220,234],"about":[39],"40":[40],"km":[41],"revisit":[44],"time":[45],"2\u20133":[47],"days.":[48],"Recent":[49],"research":[50],"shows":[51],"that":[52,216],"forward":[54],"scattered":[55],"Navigation":[57],"Satellite":[58],"System":[59],"(GNSS)":[60],"signals":[61,78,100],"can":[64,239],"convey":[65],"high-resolution":[66],"information":[67],"land":[69,84,127],"surface":[70,73,85,102,128],"conditions,":[71],"including":[72],"moisture.":[75,104],"However,":[76],"these":[77],"often":[80],"affected":[81],"by":[82,143],"complex":[83],"characteristics":[86],"bistatic":[89],"nature":[90],"GNSS-R":[92],"technique,":[93],"leading":[94],"to":[95,115],"nonlinear":[96],"relation":[97],"between":[98],"In":[105,246],"this":[106],"work,":[107],"machine":[109],"learning":[110],"(ML)":[111],"approach":[112],"used":[114,133],"map":[116],"quasi-global":[117],"from":[120],"Cyclone":[121],"GNSS":[122],"(CYGNSS)":[123],"observables.":[124],"Specifically,":[125],"parameters":[129],"obtained":[131],"in":[134,139],"combination":[135],"with":[136,163,191,226],"CYGNSS":[137,210,221,250],"data":[138,151,211],"ML":[141,159],"model":[142],"using":[144],"Soil":[146],"Moisture":[147],"Active":[148],"Passive":[149],"(SMAP)":[150],"as":[152],"reference.":[153],"A":[154],"good":[155],"performance":[156],"method":[160],"achieved":[162],"median":[164],"ubRMSDs":[165],"0.0426":[167],"m":[168,178],"<sup":[169,173,179,183,199,261,264],"xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"":[170,174,180,184,200,262,265],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">3</sup>":[171,175,181,185],"/m":[172,182],"0.034":[177],"coverage":[188],"regions":[190],"vegetation":[192],"water":[193],"content":[194],"less":[195],"than":[196],"4":[197],"kg/m":[198],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">2</sup>":[201],",":[202],"respectively.":[203],"Moreover,":[204],"an":[205,230],"independent":[206],"evaluation":[207],"against":[212],"in-situ":[213],"measurements":[214],"suggests":[215],"overall":[218],"accuracy":[219],"comparable":[225],"SMAP":[227],"data.":[228],"With":[229],"increased":[231],"sampling":[232],"frequency":[233],"CYGNSS,":[235],"generated":[237],"products":[238,251],"supplement":[240],"current":[241],"database.":[245],"addition,":[247],"ML-based":[249],"published":[253],"via":[254],"website":[256],"portal":[257],"future":[259],"users":[260],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">1</sup>":[263,266],"https://www.gri.msstate.edu/research/ssm/.":[267]},"counts_by_year":[{"year":2026,"cited_by_count":1},{"year":2025,"cited_by_count":2},{"year":2024,"cited_by_count":1},{"year":2023,"cited_by_count":3},{"year":2022,"cited_by_count":1}],"updated_date":"2026-03-27T14:29:43.386196","created_date":"2025-10-10T00:00:00"}
