{"id":"https://openalex.org/W2062888356","doi":"https://doi.org/10.1109/tgrs.2012.2226731","title":"Using Thermal Time and Pixel Purity for Enhancing Biophysical Variable Time Series: An Interproduct Comparison","display_name":"Using Thermal Time and Pixel Purity for Enhancing Biophysical Variable Time Series: An Interproduct Comparison","publication_year":2012,"publication_date":"2012-12-21","ids":{"openalex":"https://openalex.org/W2062888356","doi":"https://doi.org/10.1109/tgrs.2012.2226731","mag":"2062888356"},"language":"en","primary_location":{"id":"doi:10.1109/tgrs.2012.2226731","is_oa":false,"landing_page_url":"https://doi.org/10.1109/tgrs.2012.2226731","pdf_url":null,"source":{"id":"https://openalex.org/S111326731","display_name":"IEEE Transactions on Geoscience and Remote Sensing","issn_l":"0196-2892","issn":["0196-2892","1558-0644"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Transactions on Geoscience and Remote Sensing","raw_type":"journal-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/A5088465455","display_name":"Gr\u00e9gory Duveiller","orcid":"https://orcid.org/0000-0002-6471-8404"},"institutions":[{"id":"https://openalex.org/I4210118689","display_name":"Joint Research Centre","ror":"https://ror.org/02qezmz13","country_code":"IT","type":"government","lineage":["https://openalex.org/I1320481043","https://openalex.org/I2800387288","https://openalex.org/I4210118689","https://openalex.org/I4210161702"]}],"countries":["IT"],"is_corresponding":false,"raw_author_name":"Gr\u00e9gory Duveiller","raw_affiliation_strings":["European Commission Joint Research Centre, Ispra, Italy","Joint Res. Centre, Eur. Comm., Ispra, Italy"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"European Commission Joint Research Centre, Ispra, Italy","institution_ids":["https://openalex.org/I4210118689"]},{"raw_affiliation_string":"Joint Res. Centre, Eur. Comm., Ispra, Italy","institution_ids":["https://openalex.org/I4210118689"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5045314681","display_name":"Fr\u00e9d\u00e9ric Baret","orcid":"https://orcid.org/0000-0002-7655-8997"},"institutions":[{"id":"https://openalex.org/I4210088668","display_name":"Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement","ror":"https://ror.org/003vg9w96","country_code":"FR","type":"government","lineage":["https://openalex.org/I4210088668"]},{"id":"https://openalex.org/I4210103063","display_name":"D\u00e9partement agronomie et sciences de l'environnement pour les agro\u00e9cosyst\u00e8mes","ror":"https://ror.org/01e7wth34","country_code":"FR","type":"facility","lineage":["https://openalex.org/I4210088668","https://openalex.org/I4210103063"]}],"countries":["FR"],"is_corresponding":false,"raw_author_name":"Fr\u00e9d\u00e9ric Baret","raw_affiliation_strings":["Environnement M\u00e9diterran\u00e9en et Mod\u00e9lisation des Agro-Hydrosyst\u00e8mes, Unit\u00e9 Mixte de Recherche 1114, Institut National de la Recherche Agronomique, Avignon, France","Environ. Mediterraneen et Modelisation des Agro-Hydrosystemes (EMMAH), Inst. Nat. de la Rech. Agronomique, Avignon, France"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Environnement M\u00e9diterran\u00e9en et Mod\u00e9lisation des Agro-Hydrosyst\u00e8mes, Unit\u00e9 Mixte de Recherche 1114, Institut National de la Recherche Agronomique, Avignon, France","institution_ids":["https://openalex.org/I4210103063"]},{"raw_affiliation_string":"Environ. Mediterraneen et Modelisation des Agro-Hydrosystemes (EMMAH), Inst. Nat. de la Rech. Agronomique, Avignon, France","institution_ids":["https://openalex.org/I4210088668","https://openalex.org/I4210103063"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5055338308","display_name":"Pierre Defourny","orcid":null},"institutions":[{"id":"https://openalex.org/I95674353","display_name":"UCLouvain","ror":"https://ror.org/02495e989","country_code":"BE","type":"education","lineage":["https://openalex.org/I95674353"]}],"countries":["BE"],"is_corresponding":false,"raw_author_name":"Pierre Defourny","raw_affiliation_strings":["Earth and Life Institute, Universit\u00e9 Catholique de Louvain, Louvain-la-Neuve, Belgium","Earth & Life Inst., Univ. Catholique de Louvain, Louvain-la-Neuve, Belgium"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Earth and Life Institute, Universit\u00e9 Catholique de Louvain, Louvain-la-Neuve, Belgium","institution_ids":["https://openalex.org/I95674353"]},{"raw_affiliation_string":"Earth & Life Inst., Univ. Catholique de Louvain, Louvain-la-Neuve, Belgium","institution_ids":["https://openalex.org/I95674353"]}]}],"institutions":[],"countries_distinct_count":3,"institutions_distinct_count":4,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":1.6582,"has_fulltext":false,"cited_by_count":24,"citation_normalized_percentile":{"value":0.83223004,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":98},"biblio":{"volume":"51","issue":"4","first_page":"2119","last_page":"2127"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10111","display_name":"Remote Sensing in Agriculture","score":1.0,"subfield":{"id":"https://openalex.org/subfields/2303","display_name":"Ecology"},"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/T10111","display_name":"Remote Sensing in Agriculture","score":1.0,"subfield":{"id":"https://openalex.org/subfields/2303","display_name":"Ecology"},"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/T14365","display_name":"Leaf Properties and Growth Measurement","score":0.9983000159263611,"subfield":{"id":"https://openalex.org/subfields/1110","display_name":"Plant Science"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T11164","display_name":"Remote Sensing and LiDAR Applications","score":0.9943000078201294,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/remote-sensing","display_name":"Remote sensing","score":0.8048504590988159},{"id":"https://openalex.org/keywords/leaf-area-index","display_name":"Leaf area index","score":0.6908117532730103},{"id":"https://openalex.org/keywords/environmental-science","display_name":"Environmental science","score":0.658852756023407},{"id":"https://openalex.org/keywords/image-resolution","display_name":"Image resolution","score":0.6025369167327881},{"id":"https://openalex.org/keywords/pixel","display_name":"Pixel","score":0.5963369607925415},{"id":"https://openalex.org/keywords/moderate-resolution-imaging-spectroradiometer","display_name":"Moderate-resolution imaging spectroradiometer","score":0.5898501873016357},{"id":"https://openalex.org/keywords/temporal-resolution","display_name":"Temporal resolution","score":0.5590612888336182},{"id":"https://openalex.org/keywords/time-series","display_name":"Time series","score":0.5133396983146667},{"id":"https://openalex.org/keywords/scale","display_name":"Scale (ratio)","score":0.5102345943450928},{"id":"https://openalex.org/keywords/spectroradiometer","display_name":"Spectroradiometer","score":0.5047475099563599},{"id":"https://openalex.org/keywords/series","display_name":"Series (stratigraphy)","score":0.4239296019077301},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.36708348989486694},{"id":"https://openalex.org/keywords/satellite","display_name":"Satellite","score":0.2573203444480896},{"id":"https://openalex.org/keywords/geography","display_name":"Geography","score":0.11863136291503906},{"id":"https://openalex.org/keywords/geology","display_name":"Geology","score":0.09626680612564087},{"id":"https://openalex.org/keywords/reflectivity","display_name":"Reflectivity","score":0.09392645955085754},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.07774996757507324}],"concepts":[{"id":"https://openalex.org/C62649853","wikidata":"https://www.wikidata.org/wiki/Q199687","display_name":"Remote sensing","level":1,"score":0.8048504590988159},{"id":"https://openalex.org/C25989453","wikidata":"https://www.wikidata.org/wiki/Q446746","display_name":"Leaf area index","level":2,"score":0.6908117532730103},{"id":"https://openalex.org/C39432304","wikidata":"https://www.wikidata.org/wiki/Q188847","display_name":"Environmental science","level":0,"score":0.658852756023407},{"id":"https://openalex.org/C205372480","wikidata":"https://www.wikidata.org/wiki/Q210521","display_name":"Image resolution","level":2,"score":0.6025369167327881},{"id":"https://openalex.org/C160633673","wikidata":"https://www.wikidata.org/wiki/Q355198","display_name":"Pixel","level":2,"score":0.5963369607925415},{"id":"https://openalex.org/C2777007095","wikidata":"https://www.wikidata.org/wiki/Q676840","display_name":"Moderate-resolution imaging spectroradiometer","level":3,"score":0.5898501873016357},{"id":"https://openalex.org/C119666444","wikidata":"https://www.wikidata.org/wiki/Q5977280","display_name":"Temporal resolution","level":2,"score":0.5590612888336182},{"id":"https://openalex.org/C151406439","wikidata":"https://www.wikidata.org/wiki/Q186588","display_name":"Time series","level":2,"score":0.5133396983146667},{"id":"https://openalex.org/C2778755073","wikidata":"https://www.wikidata.org/wiki/Q10858537","display_name":"Scale (ratio)","level":2,"score":0.5102345943450928},{"id":"https://openalex.org/C130066347","wikidata":"https://www.wikidata.org/wiki/Q680509","display_name":"Spectroradiometer","level":3,"score":0.5047475099563599},{"id":"https://openalex.org/C143724316","wikidata":"https://www.wikidata.org/wiki/Q312468","display_name":"Series (stratigraphy)","level":2,"score":0.4239296019077301},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.36708348989486694},{"id":"https://openalex.org/C19269812","wikidata":"https://www.wikidata.org/wiki/Q26540","display_name":"Satellite","level":2,"score":0.2573203444480896},{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.11863136291503906},{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.09626680612564087},{"id":"https://openalex.org/C108597893","wikidata":"https://www.wikidata.org/wiki/Q663650","display_name":"Reflectivity","level":2,"score":0.09392645955085754},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.07774996757507324},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.0},{"id":"https://openalex.org/C120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","level":1,"score":0.0},{"id":"https://openalex.org/C62520636","wikidata":"https://www.wikidata.org/wiki/Q944","display_name":"Quantum mechanics","level":1,"score":0.0},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.0},{"id":"https://openalex.org/C151730666","wikidata":"https://www.wikidata.org/wiki/Q7205","display_name":"Paleontology","level":1,"score":0.0},{"id":"https://openalex.org/C18903297","wikidata":"https://www.wikidata.org/wiki/Q7150","display_name":"Ecology","level":1,"score":0.0},{"id":"https://openalex.org/C119857082","wikidata":"https://www.wikidata.org/wiki/Q2539","display_name":"Machine learning","level":1,"score":0.0},{"id":"https://openalex.org/C146978453","wikidata":"https://www.wikidata.org/wiki/Q3798668","display_name":"Aerospace engineering","level":1,"score":0.0},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.0},{"id":"https://openalex.org/C58640448","wikidata":"https://www.wikidata.org/wiki/Q42515","display_name":"Cartography","level":1,"score":0.0}],"mesh":[],"locations_count":4,"locations":[{"id":"doi:10.1109/tgrs.2012.2226731","is_oa":false,"landing_page_url":"https://doi.org/10.1109/tgrs.2012.2226731","pdf_url":null,"source":{"id":"https://openalex.org/S111326731","display_name":"IEEE Transactions on Geoscience and Remote Sensing","issn_l":"0196-2892","issn":["0196-2892","1558-0644"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Transactions on Geoscience and Remote Sensing","raw_type":"journal-article"},{"id":"pmh:oai:HAL:hal-01317529v1","is_oa":false,"landing_page_url":"https://hal.science/hal-01317529","pdf_url":null,"source":{"id":"https://openalex.org/S4306402512","display_name":"HAL (Le Centre pour la Communication Scientifique Directe)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1294671590","host_organization_name":"Centre National de la Recherche Scientifique","host_organization_lineage":["https://openalex.org/I1294671590"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"IEEE Transactions on Geoscience and Remote Sensing, 2013, 51 (4), pp.2119 - 2127. ⟨10.1109/TGRS.2012.2226731⟩","raw_type":"info:eu-repo/semantics/article"},{"id":"pmh:oai:dial.uclouvain.be:boreal:135321","is_oa":false,"landing_page_url":"http://hdl.handle.net/2078.1/135321","pdf_url":null,"source":{"id":"https://openalex.org/S4306401974","display_name":"DIAL (Catholic University of Leuven)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I99464096","host_organization_name":"KU Leuven","host_organization_lineage":["https://openalex.org/I99464096"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"IEEE Transaction on Geoscience and Remote Sensing, Vol. 51, no. 4, p. 2119-2127 (March 2013)","raw_type":"info:eu-repo/semantics/article"},{"id":"pmh:oai:publications.jrc.ec.europa.eu:JRC69916","is_oa":false,"landing_page_url":"http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6392256","pdf_url":null,"source":{"id":"https://openalex.org/S4306401126","display_name":"Joint Research Centre (European Commission)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I2800387288","host_organization_name":"European Commission","host_organization_lineage":["https://openalex.org/I2800387288"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Articles in Journals"}],"best_oa_location":null,"sustainable_development_goals":[{"score":0.5699999928474426,"id":"https://metadata.un.org/sdg/15","display_name":"Life in Land"}],"awards":[],"funders":[{"id":"https://openalex.org/F4320318621","display_name":"Waalse Gewest","ror":null}],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":45,"referenced_works":["https://openalex.org/W61452412","https://openalex.org/W1566520081","https://openalex.org/W1578368825","https://openalex.org/W1740479806","https://openalex.org/W1970004911","https://openalex.org/W1970468125","https://openalex.org/W1978160572","https://openalex.org/W1987139340","https://openalex.org/W2005881244","https://openalex.org/W2013592760","https://openalex.org/W2032819102","https://openalex.org/W2033943160","https://openalex.org/W2037416377","https://openalex.org/W2043950171","https://openalex.org/W2048040783","https://openalex.org/W2049476189","https://openalex.org/W2049782549","https://openalex.org/W2050136897","https://openalex.org/W2058214432","https://openalex.org/W2066612219","https://openalex.org/W2068557772","https://openalex.org/W2084616221","https://openalex.org/W2087493339","https://openalex.org/W2092625252","https://openalex.org/W2103509248","https://openalex.org/W2109468334","https://openalex.org/W2115049406","https://openalex.org/W2121025745","https://openalex.org/W2124791638","https://openalex.org/W2129449540","https://openalex.org/W2130995459","https://openalex.org/W2134758486","https://openalex.org/W2144615603","https://openalex.org/W2151647593","https://openalex.org/W2152742775","https://openalex.org/W2153243519","https://openalex.org/W2153783191","https://openalex.org/W2155490712","https://openalex.org/W2156114555","https://openalex.org/W2156468842","https://openalex.org/W2167556755","https://openalex.org/W2167968759","https://openalex.org/W2170480554","https://openalex.org/W2224174650","https://openalex.org/W6637670969"],"related_works":["https://openalex.org/W1968901811","https://openalex.org/W2087241461","https://openalex.org/W1609312116","https://openalex.org/W2098219828","https://openalex.org/W2045907675","https://openalex.org/W2360114125","https://openalex.org/W2028054326","https://openalex.org/W2023226251","https://openalex.org/W3100717430","https://openalex.org/W2990874366"],"abstract_inverted_index":{"This":[0],"paper":[1],"presents":[2],"a":[3,70,84,151],"multiannual":[4],"comparison":[5],"at":[6],"regional":[7],"scale":[8,63],"of":[9,52,118,155,159,165,180,193,200],"currently":[10],"available":[11],"1-km":[12,94,195],"global":[13],"leaf":[14],"area":[15,22],"index":[16,23],"(LAI)":[17],"products":[18],"with":[19,219],"crop-specific":[20,39],"green":[21],"(GAI)":[24],"retrieved":[25],"from":[26,31,43,115,216],"250-m":[27,147],"spatial":[28,50,221],"resolution":[29,224],"imagery":[30],"the":[32,44,61,78,93,105,129,146,156,160,170,178,188,194,198],"Moderate":[33],"Resolution":[34],"Imaging":[35],"Spectroradiometer":[36],"(MODIS).":[37],"The":[38,139],"GAI":[40,148],"product":[41,149],"benefits":[42],"following":[45],"extra":[46],"processing":[47],"steps:":[48],"1)":[49],"filtering":[51],"time":[53,62,157,175,182],"series":[54],"based":[55],"on":[56],"pixel":[57,184],"purity;":[58],"2)":[59],"transforming":[60],"to":[64,75,82,92,127],"thermal":[65,181],"time;":[66],"and":[67,101,109,172,183,191,222],"3)":[68],"fitting":[69],"canopy":[71],"structural":[72],"dynamic":[73],"model":[74],"smooth":[76],"out":[77],"signal.":[79],"In":[80],"order":[81],"perform":[83],"rigorous":[85],"comparison,":[86],"these":[87,205],"steps":[88],"were":[89],"also":[90,125,186],"applied":[91],"LAI":[95,99,102],"products,":[96],"namely,":[97],"MODIS":[98],"(MCD15)":[100],"produced":[103],"in":[104,111,131,163,210],"CYCLOPES":[106],"(Carbon":[107],"cYcle":[108],"Change":[110],"Land":[112],"Observational":[113],"Products":[114],"an":[116],"Ensemble":[117],"Satellites)":[119],"project.":[120],"A":[121],"simple":[122],"indicator":[123],"was":[124],"designed":[126],"quantify":[128],"increase":[130],"temporal":[132,189,223],"smoothness":[133],"that":[134,204],"can":[135],"thus":[136],"be":[137,208],"obtained.":[138],"results":[140,199],"confirm":[141],"that,":[142],"for":[143,225],"winter":[144],"wheat,":[145],"provides":[150],"more":[152],"realistic":[153],"description":[154],"course":[158],"biophysical":[161],"variable":[162],"terms":[164],"reaching":[166],"higher":[167],"values,":[168],"grasping":[169],"variability,":[171],"providing":[173],"smoother":[174],"series.":[176],"However,":[177],"use":[179],"purity":[185],"improves":[187],"consistency":[190],"coherence":[192],"products.":[196],"Overall,":[197],"this":[201],"study":[202],"suggest":[203],"techniques":[206],"could":[207],"valuable":[209],"harmonizing":[211],"remote":[212],"sensing":[213],"data":[214],"coming":[215],"different":[217],"sources":[218],"varying":[220],"enhanced":[226],"vegetation":[227],"monitoring.":[228]},"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2024,"cited_by_count":3},{"year":2023,"cited_by_count":2},{"year":2022,"cited_by_count":2},{"year":2021,"cited_by_count":1},{"year":2020,"cited_by_count":1},{"year":2019,"cited_by_count":2},{"year":2018,"cited_by_count":2},{"year":2017,"cited_by_count":2},{"year":2016,"cited_by_count":2},{"year":2015,"cited_by_count":4},{"year":2013,"cited_by_count":2}],"updated_date":"2026-07-25T15:57:00.446498","created_date":"2025-10-10T00:00:00"}