{"id":"https://openalex.org/W2994887439","doi":"https://doi.org/10.1017/s0373463319000961","title":"Coutinho's Method for the Altitude","display_name":"Coutinho's Method for the Altitude","publication_year":2019,"publication_date":"2019-12-11","ids":{"openalex":"https://openalex.org/W2994887439","doi":"https://doi.org/10.1017/s0373463319000961","mag":"2994887439"},"language":"en","primary_location":{"id":"doi:10.1017/s0373463319000961","doi":"https://doi.org/10.1017/s0373463319000961","is_oa":false,"landing_page_url":"https://doi.org/10.1017/s0373463319000961","pdf_url":null,"source":{"id":"https://openalex.org/S14252860","display_name":"Journal of Navigation","issn_l":"0373-4633","issn":["0373-4633","1469-7785"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["cwts-core","dongbi-b","jufo-1","norway-1","poland-70","russia-white-list-1"],"host_organization":"https://openalex.org/P4310311721","host_organization_name":"Cambridge University Press","host_organization_lineage":["https://openalex.org/P4310311721","https://openalex.org/P4310311702"],"host_organization_lineage_names":["Cambridge University Press","University of Cambridge"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Navigation","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"green","oa_url":"https://run.unl.pt/bitstreams/507a4431-b963-486c-81f3-46e045cc21ff/download","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5110941594","display_name":"Ant\u00f3nio Costa Canas","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I141596103","display_name":"University of Lisbon","ror":"https://ror.org/01c27hj86","country_code":"PT","type":"education","lineage":["https://openalex.org/I141596103"]},{"id":"https://openalex.org/I4405252608","display_name":"Base Naval de Lisboa","ror":"https://ror.org/041bgx172","country_code":"PT","type":"government","lineage":["https://openalex.org/I4405252608"]},{"id":"https://openalex.org/I4405252674","display_name":"Centro de Investiga\u00e7\u00e3o Naval","ror":"https://ror.org/01wjsdp58","country_code":"PT","type":"education","lineage":["https://openalex.org/I4405252674"]},{"id":"https://openalex.org/I921685582","display_name":"Escola Naval","ror":"https://ror.org/01ev6gy70","country_code":"PT","type":"education","lineage":["https://openalex.org/I4403386485","https://openalex.org/I4403386575","https://openalex.org/I921685582"]}],"countries":["PT"],"is_corresponding":false,"raw_author_name":"Ant\u00f3nio Costa Canas","raw_affiliation_strings":["CH-ULisboa, Universidade de Lisboa, Lisbon, Portugal","Escola Naval and CINAV, Base Naval de Lisboa \u2013 Alfeite, Almada, Portugal"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"CH-ULisboa, Universidade de Lisboa, Lisbon, Portugal","institution_ids":["https://openalex.org/I141596103"]},{"raw_affiliation_string":"Escola Naval and CINAV, Base Naval de Lisboa \u2013 Alfeite, Almada, Portugal","institution_ids":["https://openalex.org/I4405252608","https://openalex.org/I4405252674","https://openalex.org/I921685582"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5057831635","display_name":"Magda Ramires Marabujo","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I4405252608","display_name":"Base Naval de Lisboa","ror":"https://ror.org/041bgx172","country_code":"PT","type":"government","lineage":["https://openalex.org/I4405252608"]},{"id":"https://openalex.org/I921685582","display_name":"Escola Naval","ror":"https://ror.org/01ev6gy70","country_code":"PT","type":"education","lineage":["https://openalex.org/I4403386485","https://openalex.org/I4403386575","https://openalex.org/I921685582"]}],"countries":["PT"],"is_corresponding":false,"raw_author_name":"Magda Ramires Marabujo","raw_affiliation_strings":["Escola Naval, Base Naval de Lisboa \u2013 Alfeite, Almada, Portugal"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Escola Naval, Base Naval de Lisboa \u2013 Alfeite, Almada, Portugal","institution_ids":["https://openalex.org/I4405252608","https://openalex.org/I921685582"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5064010210","display_name":"Teresa Sousa","orcid":"https://orcid.org/0000-0002-3322-580X","observed_orcids":["https://orcid.org/0000-0002-3322-580X"]},"institutions":[{"id":"https://openalex.org/I4405252608","display_name":"Base Naval de Lisboa","ror":"https://ror.org/041bgx172","country_code":"PT","type":"government","lineage":["https://openalex.org/I4405252608"]},{"id":"https://openalex.org/I4405252674","display_name":"Centro de Investiga\u00e7\u00e3o Naval","ror":"https://ror.org/01wjsdp58","country_code":"PT","type":"education","lineage":["https://openalex.org/I4405252674"]},{"id":"https://openalex.org/I4405257427","display_name":"Centro de Matem\u00e1tica e Aplica\u00e7\u00f5es","ror":"https://ror.org/058dvej55","country_code":"PT","type":"facility","lineage":["https://openalex.org/I161321875","https://openalex.org/I4405257427"]},{"id":"https://openalex.org/I921685582","display_name":"Escola Naval","ror":"https://ror.org/01ev6gy70","country_code":"PT","type":"education","lineage":["https://openalex.org/I4403386485","https://openalex.org/I4403386575","https://openalex.org/I921685582"]}],"countries":["PT"],"is_corresponding":true,"raw_author_name":"Teresa Sousa","raw_affiliation_strings":["Centro de Matem\u00e1tica e Aplica\u00e7\u00f5es (CMA), FCT-UNL, Campus de Caparica, Caparica, Portugal","Escola Naval and CINAV, Base Naval de Lisboa \u2013 Alfeite, Almada, Portugal"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Centro de Matem\u00e1tica e Aplica\u00e7\u00f5es (CMA), FCT-UNL, Campus de Caparica, Caparica, Portugal","institution_ids":["https://openalex.org/I4405257427"]},{"raw_affiliation_string":"Escola Naval and CINAV, Base Naval de Lisboa \u2013 Alfeite, Almada, Portugal","institution_ids":["https://openalex.org/I4405252608","https://openalex.org/I4405252674","https://openalex.org/I921685582"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":5,"corresponding_author_ids":["https://openalex.org/A5064010210"],"corresponding_institution_ids":["https://openalex.org/I4405252608","https://openalex.org/I4405252674","https://openalex.org/I4405257427","https://openalex.org/I921685582"],"apc_list":{"value":2835,"currency":"USD","value_usd":2835},"apc_paid":null,"fwci":0.8313,"has_fulltext":true,"cited_by_count":1,"citation_normalized_percentile":{"value":0.7795244,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":88,"max":93},"biblio":{"volume":"73","issue":"4","first_page":"861","last_page":"873"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T13854","display_name":"Historical Geography and Cartography","score":0.7103999853134155,"subfield":{"id":"https://openalex.org/subfields/3305","display_name":"Geography, Planning and Development"},"field":{"id":"https://openalex.org/fields/33","display_name":"Social Sciences"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}},"topics":[{"id":"https://openalex.org/T13854","display_name":"Historical Geography and Cartography","score":0.7103999853134155,"subfield":{"id":"https://openalex.org/subfields/3305","display_name":"Geography, Planning and Development"},"field":{"id":"https://openalex.org/fields/33","display_name":"Social Sciences"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}},{"id":"https://openalex.org/T14116","display_name":"Aviation History and Innovations","score":0.22509999573230743,"subfield":{"id":"https://openalex.org/subfields/1207","display_name":"History and Philosophy of Science"},"field":{"id":"https://openalex.org/fields/12","display_name":"Arts and Humanities"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}},{"id":"https://openalex.org/T12170","display_name":"History and Theory of Mathematics","score":0.026900000870227814,"subfield":{"id":"https://openalex.org/subfields/1207","display_name":"History and Philosophy of Science"},"field":{"id":"https://openalex.org/fields/12","display_name":"Arts and Humanities"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/celestial-navigation","display_name":"celestial navigation","score":0.7789999842643738},{"id":"https://openalex.org/keywords/aircraft-navigation","display_name":"aircraft navigation","score":0.32600000500679016},{"id":"https://openalex.org/keywords/history-of-aviation","display_name":"aviation history","score":0.4749999940395355}],"concepts":[{"id":"https://openalex.org/C6350597","wikidata":"https://www.wikidata.org/wiki/Q339495","display_name":"Altitude (triangle)","level":2,"score":0.727741003036499},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6761746406555176},{"id":"https://openalex.org/C198082294","wikidata":"https://www.wikidata.org/wiki/Q3399648","display_name":"Position (finance)","level":2,"score":0.5371898412704468},{"id":"https://openalex.org/C2993172488","wikidata":"https://www.wikidata.org/wiki/Q190200","display_name":"Low altitude","level":3,"score":0.42980656027793884},{"id":"https://openalex.org/C62649853","wikidata":"https://www.wikidata.org/wiki/Q199687","display_name":"Remote sensing","level":1,"score":0.3526087999343872},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.1244555115699768},{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.10343682765960693},{"id":"https://openalex.org/C10138342","wikidata":"https://www.wikidata.org/wiki/Q43015","display_name":"Finance","level":1,"score":0.0},{"id":"https://openalex.org/C162324750","wikidata":"https://www.wikidata.org/wiki/Q8134","display_name":"Economics","level":0,"score":0.0},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.0}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1017/s0373463319000961","doi":"https://doi.org/10.1017/s0373463319000961","is_oa":false,"landing_page_url":"https://doi.org/10.1017/s0373463319000961","pdf_url":null,"source":{"id":"https://openalex.org/S14252860","display_name":"Journal of Navigation","issn_l":"0373-4633","issn":["0373-4633","1469-7785"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["cwts-core","dongbi-b","jufo-1","norway-1","poland-70","russia-white-list-1"],"host_organization":"https://openalex.org/P4310311721","host_organization_name":"Cambridge University Press","host_organization_lineage":["https://openalex.org/P4310311721","https://openalex.org/P4310311702"],"host_organization_lineage_names":["Cambridge University Press","University of Cambridge"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Navigation","raw_type":"journal-article"},{"id":"pmh:oai:run.unl.pt:10362/106686","doi":null,"is_oa":true,"landing_page_url":"https://www.scopus.com/pages/publications/85076707338","pdf_url":"https://run.unl.pt/bitstreams/507a4431-b963-486c-81f3-46e045cc21ff/download","source":{"id":"https://openalex.org/S4306402433","display_name":"Portuguese National Funding Agency for Science, Research and Technology (RCAAP Project by FCT)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":"other-oa","license_id":"https://openalex.org/licenses/other-oa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"journal article"}],"best_oa_location":{"id":"pmh:oai:run.unl.pt:10362/106686","doi":null,"is_oa":true,"landing_page_url":"https://www.scopus.com/pages/publications/85076707338","pdf_url":"https://run.unl.pt/bitstreams/507a4431-b963-486c-81f3-46e045cc21ff/download","source":{"id":"https://openalex.org/S4306402433","display_name":"Portuguese National Funding Agency for Science, Research and Technology (RCAAP Project by FCT)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":"other-oa","license_id":"https://openalex.org/licenses/other-oa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"journal article"},"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W2994887439.pdf","grobid_xml":"https://content.openalex.org/works/W2994887439.grobid-xml"},"referenced_works_count":1,"referenced_works":["https://openalex.org/W588300851"],"related_works":["https://openalex.org/W4385356175","https://openalex.org/W2525022414","https://openalex.org/W2324361451","https://openalex.org/W2132398806","https://openalex.org/W2524988689","https://openalex.org/W2318467414","https://openalex.org/W2322608094","https://openalex.org/W6986091856","https://openalex.org/W2526098184","https://openalex.org/W1977463388"],"abstract_inverted_index":{"In":[0,30,99],"the":[1,6,36,41,45,60,78,82,117,135],"first":[2],"aerial":[3,28],"crossing":[4],"of":[5,19,44,116,127],"South":[7],"Atlantic,":[8],"by":[9],"Gago":[10],"Coutinho":[11,70,89],"and":[12,85,96,119],"Sacadura":[13],"Cabral":[14],"in":[15,104],"1922,":[16],"several":[17],"methods":[18],"astronomical":[20],"maritime":[21],"navigation":[22],"were":[23],"used":[24,133],"with":[25,111],"adaptions":[26],"to":[27,32,39,72,80,108,113],"navigation.":[29],"order":[31],"apply":[33],"these":[34],"methods,":[35],"navigator":[37,79],"needed":[38],"know":[40],"approximate":[42],"altitude":[43,83],"aircraft":[46],"so":[47],"that":[48,58,76],"its":[49],"position":[50],"could":[51],"be":[52,132],"determined.":[53],"The":[54,87],"instrument":[55],"available":[56],"at":[57],"time,":[59],"altimeter,":[61],"did":[62],"not":[63],"give":[64],"reliable":[65],"values":[66],"for":[67],"altitude.":[68],"Therefore,":[69],"had":[71],"devise":[73],"a":[74,94,124],"method":[75,88,107,130],"enabled":[77],"determine":[81,109],"quickly":[84],"efficiently.":[86],"devised":[90],"is":[91],"based":[92],"on":[93],"mathematical":[95],"geometrical":[97],"procedure.":[98],"this":[100,129],"paper,":[101],"we":[102],"study":[103],"detail":[105],"Coutinho's":[106],"altitude,":[110],"diagrams":[112],"aid":[114],"understanding":[115],"deductions":[118],"calculations.":[120],"We":[121],"also":[122],"present":[123],"real":[125],"example":[126],"how":[128],"would":[131],"during":[134],"flight.":[136]},"counts_by_year":[{"year":2022,"cited_by_count":1}],"updated_date":"2026-10-30T12:39:25.321706","created_date":"2019-12-26T00:00:00"}