{"id":"https://openalex.org/W1971661867","doi":"https://doi.org/10.1080/01431168608948961","title":"Estimating and mapping grass cover and biomass from low-level photographic sampling\u2020","display_name":"Estimating and mapping grass cover and biomass from low-level photographic sampling\u2020","publication_year":1986,"publication_date":"1986-12-01","ids":{"openalex":"https://openalex.org/W1971661867","doi":"https://doi.org/10.1080/01431168608948961","mag":"1971661867"},"language":"en","primary_location":{"id":"doi:10.1080/01431168608948961","doi":"https://doi.org/10.1080/01431168608948961","is_oa":false,"landing_page_url":"https://doi.org/10.1080/01431168608948961","pdf_url":null,"source":{"id":"https://openalex.org/S117411352","display_name":"International Journal of Remote Sensing","issn_l":"0143-1161","issn":["0143-1161","1366-5901"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-d","jufo-1","norway-2","poland-70","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310320547","host_organization_name":"Taylor & Francis","host_organization_lineage":["https://openalex.org/P4310320547","https://openalex.org/P4310320449"],"host_organization_lineage_names":["Taylor & Francis","Informa"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"International Journal of Remote Sensing","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"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/A5064044404","display_name":"K. J. Dancy","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I2799553609","display_name":"Rothamsted Research","ror":"https://ror.org/0347fy350","country_code":"GB","type":"facility","lineage":["https://openalex.org/I2799553609","https://openalex.org/I2799693246","https://openalex.org/I4210087105"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"K. J. DANCY","raw_affiliation_strings":["a  Rothamsted Experimental Station , Harpenden, Hertfordshire,  England","Rothamsted Experimental Station , Harpenden, Hertfordshire, England"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"a  Rothamsted Experimental Station , Harpenden, Hertfordshire,  England","institution_ids":["https://openalex.org/I2799553609"]},{"raw_affiliation_string":"Rothamsted Experimental Station , Harpenden, Hertfordshire, England","institution_ids":["https://openalex.org/I2799553609"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5063250833","display_name":"R. Webster","orcid":"https://orcid.org/0000-0003-1767-7934","observed_orcids":["https://orcid.org/0000-0003-1767-7934","https://orcid.org/0000-0002-3424-9301","https://orcid.org/0000-0002-7682-8993","https://orcid.org/0000-0002-5325-2709","https://orcid.org/0000-0001-5843-1186"]},"institutions":[{"id":"https://openalex.org/I2799553609","display_name":"Rothamsted Research","ror":"https://ror.org/0347fy350","country_code":"GB","type":"facility","lineage":["https://openalex.org/I2799553609","https://openalex.org/I2799693246","https://openalex.org/I4210087105"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"R. WEBSTER","raw_affiliation_strings":["a  Rothamsted Experimental Station , Harpenden, Hertfordshire,  England","Rothamsted Experimental Station , Harpenden, Hertfordshire, England"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"a  Rothamsted Experimental Station , Harpenden, Hertfordshire,  England","institution_ids":["https://openalex.org/I2799553609"]},{"raw_affiliation_string":"Rothamsted Experimental Station , Harpenden, Hertfordshire, England","institution_ids":["https://openalex.org/I2799553609"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5089615331","display_name":"Nick Abel","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I1118541","display_name":"University of East Anglia","ror":"https://ror.org/026k5mg93","country_code":"GB","type":"education","lineage":["https://openalex.org/I1118541"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"N. O. J. ABEL","raw_affiliation_strings":["b  Overseas Development Group, School of Development Studies, University of East Anglia , Norwich,  England","Overseas Development Group, School of Development Studies, University of East Anglia , Norwich, England"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"b  Overseas Development Group, School of Development Studies, University of East Anglia , Norwich,  England","institution_ids":["https://openalex.org/I1118541"]},{"raw_affiliation_string":"Overseas Development Group, School of Development Studies, University of East Anglia , Norwich, England","institution_ids":["https://openalex.org/I1118541"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":3.125,"has_fulltext":false,"cited_by_count":28,"citation_normalized_percentile":{"value":0.8947253,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":88,"max":98},"biblio":{"volume":"7","issue":"12","first_page":"1679","last_page":"1704"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10111","display_name":"Remote Sensing in Agriculture","score":0.7968999743461609,"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":0.7968999743461609,"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/T10770","display_name":"Soil Geostatistics and Mapping","score":0.05790000036358833,"subfield":{"id":"https://openalex.org/subfields/1111","display_name":"Soil 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/T12467","display_name":"Rangeland Management and Livestock Ecology","score":0.03629999980330467,"subfield":{"id":"https://openalex.org/subfields/2308","display_name":"Management, Monitoring, Policy and Law"},"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/grass-cover","display_name":"grass cover","score":0.9200000166893005},{"id":"https://openalex.org/keywords/grass-biomass","display_name":"grass biomass","score":0.7979999780654907},{"id":"https://openalex.org/keywords/aerial-photography","display_name":"aerial photography","score":0.7129999995231628},{"id":"https://openalex.org/keywords/semiarid-rangelands","display_name":"semi-arid rangelands","score":0.8989999890327454},{"id":"https://openalex.org/keywords/ground-layer-vegetation","display_name":"ground layer vegetation","score":0.7730000019073486},{"id":"https://openalex.org/keywords/kriging","display_name":"kriging","score":0.6650000214576721},{"id":"https://openalex.org/keywords/semivariogram","display_name":"semivariogram","score":0.7210000157356262},{"id":"https://openalex.org/keywords/calibration-equations","display_name":"calibration equations","score":0.6690000295639038},{"id":"https://openalex.org/keywords/seasonal-variation","display_name":"seasonal variation","score":0.6150000095367432},{"id":"https://openalex.org/keywords/vegetation-mapping","display_name":"vegetation mapping","score":0.6660000085830688},{"id":"https://openalex.org/keywords/botswana","display_name":"Botswana","score":0.9179999828338623}],"concepts":[{"id":"https://openalex.org/C81692654","wikidata":"https://www.wikidata.org/wiki/Q225926","display_name":"Kriging","level":2,"score":0.7743008136749268},{"id":"https://openalex.org/C69661492","wikidata":"https://www.wikidata.org/wiki/Q1447141","display_name":"Transect","level":2,"score":0.6373454332351685},{"id":"https://openalex.org/C140779682","wikidata":"https://www.wikidata.org/wiki/Q210868","display_name":"Sampling (signal processing)","level":3,"score":0.6370742321014404},{"id":"https://openalex.org/C115540264","wikidata":"https://www.wikidata.org/wiki/Q2945560","display_name":"Biomass (ecology)","level":2,"score":0.6294234395027161},{"id":"https://openalex.org/C165838908","wikidata":"https://www.wikidata.org/wiki/Q736777","display_name":"Calibration","level":2,"score":0.5896861553192139},{"id":"https://openalex.org/C39432304","wikidata":"https://www.wikidata.org/wiki/Q188847","display_name":"Environmental science","level":0,"score":0.5711974501609802},{"id":"https://openalex.org/C62649853","wikidata":"https://www.wikidata.org/wiki/Q199687","display_name":"Remote sensing","level":1,"score":0.4661470949649811},{"id":"https://openalex.org/C2780648208","wikidata":"https://www.wikidata.org/wiki/Q3001793","display_name":"Land cover","level":3,"score":0.45330700278282166},{"id":"https://openalex.org/C2780428219","wikidata":"https://www.wikidata.org/wiki/Q16952335","display_name":"Cover (algebra)","level":2,"score":0.4513588547706604},{"id":"https://openalex.org/C76886044","wikidata":"https://www.wikidata.org/wiki/Q2883300","display_name":"Hydrology (agriculture)","level":2,"score":0.35006439685821533},{"id":"https://openalex.org/C91586092","wikidata":"https://www.wikidata.org/wiki/Q757520","display_name":"Atmospheric sciences","level":1,"score":0.3399771749973297},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.32022958993911743},{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.3100646734237671},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.3083478808403015},{"id":"https://openalex.org/C18903297","wikidata":"https://www.wikidata.org/wiki/Q7150","display_name":"Ecology","level":1,"score":0.14203500747680664},{"id":"https://openalex.org/C94915269","wikidata":"https://www.wikidata.org/wiki/Q1834857","display_name":"Detector","level":2,"score":0.09563988447189331},{"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/C78519656","wikidata":"https://www.wikidata.org/wiki/Q101333","display_name":"Mechanical engineering","level":1,"score":0.0},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"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/C119599485","wikidata":"https://www.wikidata.org/wiki/Q43035","display_name":"Electrical engineering","level":1,"score":0.0},{"id":"https://openalex.org/C111368507","wikidata":"https://www.wikidata.org/wiki/Q43518","display_name":"Oceanography","level":1,"score":0.0},{"id":"https://openalex.org/C4792198","wikidata":"https://www.wikidata.org/wiki/Q1165944","display_name":"Land use","level":2,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1080/01431168608948961","doi":"https://doi.org/10.1080/01431168608948961","is_oa":false,"landing_page_url":"https://doi.org/10.1080/01431168608948961","pdf_url":null,"source":{"id":"https://openalex.org/S117411352","display_name":"International Journal of Remote Sensing","issn_l":"0143-1161","issn":["0143-1161","1366-5901"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-d","jufo-1","norway-2","poland-70","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310320547","host_organization_name":"Taylor & Francis","host_organization_lineage":["https://openalex.org/P4310320547","https://openalex.org/P4310320449"],"host_organization_lineage_names":["Taylor & Francis","Informa"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"International Journal of Remote Sensing","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/15","display_name":"Life on land","score":1.0}],"study_designs":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":20,"referenced_works":["https://openalex.org/W436320942","https://openalex.org/W1485678107","https://openalex.org/W1765455324","https://openalex.org/W1866320023","https://openalex.org/W1978140778","https://openalex.org/W1983335790","https://openalex.org/W2019752143","https://openalex.org/W2036079720","https://openalex.org/W2040496597","https://openalex.org/W2062599367","https://openalex.org/W2063925748","https://openalex.org/W2094326866","https://openalex.org/W2299896372","https://openalex.org/W2314461932","https://openalex.org/W2318908385","https://openalex.org/W2330771028","https://openalex.org/W2437001038","https://openalex.org/W2517386936","https://openalex.org/W2557505665","https://openalex.org/W4250482990"],"related_works":["https://openalex.org/W4255126355","https://openalex.org/W1715891948","https://openalex.org/W2094326866","https://openalex.org/W2512778926","https://openalex.org/W7197388527","https://openalex.org/W7196939464","https://openalex.org/W1990779278","https://openalex.org/W2588390511","https://openalex.org/W2766934569","https://openalex.org/W1965042690"],"abstract_inverted_index":{"Abstract":[0],"A":[1,90,205],"method":[2],"of":[3,7,13,23,64,92,117,125,129,149,177,198],"estimating":[4],"the":[5,10,55,97,104,109,168,189,201,220,223,233,250],"quantity":[6],"biomass":[8,100,164,199,238],"in":[9,26,222,249],"ground":[11,56,71,105],"layer":[12,72],"semi-arid":[14],"rangeland":[15],"is":[16],"described":[17],"and":[18,99,113,141,156,163,186,217,232,236],"applied":[19],"to":[20,87,122,127,147,196,255],"a":[21,46,75,114,174,180],"region":[22],"700":[24],"km2":[25],"Botswana.":[27],"Vertical":[28],"true":[29],"colour":[30],"diapositives,":[31],"each":[32,80,245],"covering":[33],"approximately":[34],"60":[35,88],"\u00d7":[36],"90":[37],"m,":[38],"were":[39,101,134,139,165,194,230,239],"taken":[40],"at":[41,50,214],"1":[42],"km":[43,60,151],"intervals":[44],"from":[45,85,120,167,253],"light":[47],"aircraft":[48],"flying":[49],"about":[51],"120":[52],"m":[53],"above":[54],"along":[57],"transects":[58],"1\u00b76":[59],"apart.":[61],"The":[62,70,131,160,192],"results":[63],"four":[65],"seasonal":[66,246],"surveys":[67],"are":[68],"presented.":[69],"cover,":[73],"as":[74,143],"percentage,":[76],"was":[77],"estimated":[78],"on":[79,95,103,179],"diapositive.":[81],"It":[82],"ranged":[83,252],"mainly":[84],"10":[86,150],"percent.":[89],"set":[91],"sampling":[93],"plots":[94],"which":[96,121],"cover":[98,126,162,178,235],"measured":[102],"provided":[106],"standards":[107],"for":[108,244],"air":[110],"photograph":[111],"estimates":[112,124],"calibration":[115,203],"equation":[116],"exponential":[118,202],"form":[119],"convert":[123],"those":[128],"biomass.":[130],"values":[132],"obtained":[133],"analysed":[135],"spatially.":[136],"Sample":[137],"semi-variograms":[138],"computed":[140],"modelled":[142],"anisotropic":[144],"power":[145],"functions":[146],"lags":[148],"by":[152,158,171,184,242],"least":[153],"squares":[154],"approximation,":[155],"validated":[157],"kriging.":[159],"grass":[161],"mapped":[166],"sample":[169],"data":[170],"first":[172],"interpolating":[173],"figure":[175,190],"field":[176],"fine":[181],"mesh":[182],"grid":[183],"kriging,":[185,243],"then":[187],"contouring":[188],"field.":[191],"maps":[193],"converted":[195],"ones":[197],"using":[200],"equation.":[204],"strong":[206],"regional":[207],"pattern":[208,221],"emerged":[209],"that":[210,218],"remained":[211],"fairly":[212,227],"constant":[213],"different":[215],"seasons":[216],"matched":[219],"underlying":[224],"geology.":[225],"Four":[226],"distinct":[228],"sub-regions":[229,251],"delineated,":[231],"average":[234],"total":[237],"estimated,":[240],"again":[241],"survey.":[247],"Biomass":[248],"185":[254],"1700":[256],"kg/ha.":[257]},"counts_by_year":[{"year":2023,"cited_by_count":1},{"year":2022,"cited_by_count":5},{"year":2017,"cited_by_count":1},{"year":2014,"cited_by_count":1}],"updated_date":"2026-11-01T11:40:01.658920","created_date":"2016-06-24T00:00:00"}