{"id":"https://openalex.org/W1702043263","doi":null,"title":"Assessing vegetation changes for parts of the Sudan and Chad during 2000-2010 using time series analysis of MODIS-NDVI","display_name":"Assessing vegetation changes for parts of the Sudan and Chad during 2000-2010 using time series analysis of MODIS-NDVI","publication_year":2011,"publication_date":"2011-01-01","ids":{"openalex":"https://openalex.org/W1702043263","mag":"1702043263"},"language":"en","primary_location":{"id":"pmh:oai:lup-student-papers.lub.lu.se:2158922","doi":null,"is_oa":false,"landing_page_url":"http://lup.lub.lu.se/student-papers/record/2158922","pdf_url":null,"source":{"id":"https://openalex.org/S4306402420","display_name":"Lund University Publications Student Papers (Lund University)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I187531555","host_organization_name":"Lund University","host_organization_lineage":["https://openalex.org/I187531555"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"H2"},"volume":null,"type":"dissertation","is_traditional":true,"indexed_in":[],"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/A5031482576","display_name":"Salem Beyene Ghezahai","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":true,"raw_author_name":"Salem Beyene Ghezahai","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]}],"institutions":[],"countries_distinct_count":0,"institutions_distinct_count":0,"corresponding_author_ids":["https://openalex.org/A5031482576"],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":null,"has_fulltext":false,"cited_by_count":15,"citation_normalized_percentile":null,"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":null,"last_page":null},"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/T11186","display_name":"Hydrology and Drought Analysis","score":0.0,"subfield":{"id":"https://openalex.org/subfields/2306","display_name":"Global and Planetary Change"},"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/T14468","display_name":"Plant Ecology and Soil Science","score":0.0,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/vegetation-change","display_name":"vegetation change","score":0.902999997138977},{"id":"https://openalex.org/keywords/ndvi-time-series","display_name":"NDVI time series","score":0.9120000004768372},{"id":"https://openalex.org/keywords/vegetation-phenology","display_name":"vegetation phenology","score":0.8330000042915344},{"id":"https://openalex.org/keywords/growing-season-length","display_name":"growing season length","score":0.621999979019165},{"id":"https://openalex.org/keywords/arid-and-semi-arid-ecosystems","display_name":"arid and semi-arid ecosystems","score":0.8240000009536743},{"id":"https://openalex.org/keywords/sudan","display_name":"Sudan","score":0.6359999775886536},{"id":"https://openalex.org/keywords/chad","display_name":"Chad","score":1.0},{"id":"https://openalex.org/keywords/rainfall-variability","display_name":"rainfall variability","score":0.8550000190734863},{"id":"https://openalex.org/keywords/timesat","display_name":"TIMESAT","score":0.6430000066757202},{"id":"https://openalex.org/keywords/modis","display_name":"MODIS","score":0.527999997138977},{"id":"https://openalex.org/keywords/shrubland","display_name":"shrubland","score":0.703000009059906},{"id":"https://openalex.org/keywords/grassland","display_name":"grassland","score":0.8629999756813049},{"id":"https://openalex.org/keywords/savanna","display_name":"savanna","score":0.8539999723434448},{"id":"https://openalex.org/keywords/cropland","display_name":"cropland","score":0.8669999837875366},{"id":"https://openalex.org/keywords/land-cover","display_name":"land cover","score":0.41200000047683716}],"concepts":[{"id":"https://openalex.org/C1549246","wikidata":"https://www.wikidata.org/wiki/Q718775","display_name":"Normalized Difference Vegetation Index","level":3,"score":0.887209951877594},{"id":"https://openalex.org/C2777007095","wikidata":"https://www.wikidata.org/wiki/Q676840","display_name":"Moderate-resolution imaging spectroradiometer","level":3,"score":0.7442998886108398},{"id":"https://openalex.org/C78869512","wikidata":"https://www.wikidata.org/wiki/Q5378810","display_name":"Enhanced vegetation index","level":5,"score":0.7008768320083618},{"id":"https://openalex.org/C2776133958","wikidata":"https://www.wikidata.org/wiki/Q7918366","display_name":"Vegetation (pathology)","level":2,"score":0.6610189080238342},{"id":"https://openalex.org/C39432304","wikidata":"https://www.wikidata.org/wiki/Q188847","display_name":"Environmental science","level":0,"score":0.6529626846313477},{"id":"https://openalex.org/C51417038","wikidata":"https://www.wikidata.org/wiki/Q272737","display_name":"Phenology","level":2,"score":0.6408390998840332},{"id":"https://openalex.org/C59898753","wikidata":"https://www.wikidata.org/wiki/Q879641","display_name":"Shrubland","level":3,"score":0.5593516230583191},{"id":"https://openalex.org/C150772632","wikidata":"https://www.wikidata.org/wiki/Q1330709","display_name":"Arid","level":2,"score":0.5557364225387573},{"id":"https://openalex.org/C2775835988","wikidata":"https://www.wikidata.org/wiki/Q1006733","display_name":"Grassland","level":2,"score":0.5495296716690063},{"id":"https://openalex.org/C125403950","wikidata":"https://www.wikidata.org/wiki/Q2111082","display_name":"Seasonality","level":2,"score":0.5303307771682739},{"id":"https://openalex.org/C137660486","wikidata":"https://www.wikidata.org/wiki/Q732240","display_name":"Growing season","level":2,"score":0.523841142654419},{"id":"https://openalex.org/C100970517","wikidata":"https://www.wikidata.org/wiki/Q52107","display_name":"Physical geography","level":1,"score":0.4532642066478729},{"id":"https://openalex.org/C107054158","wikidata":"https://www.wikidata.org/wiki/Q25257","display_name":"Precipitation","level":2,"score":0.45037874579429626},{"id":"https://openalex.org/C49204034","wikidata":"https://www.wikidata.org/wiki/Q52139","display_name":"Climatology","level":1,"score":0.41622766852378845},{"id":"https://openalex.org/C132651083","wikidata":"https://www.wikidata.org/wiki/Q7942","display_name":"Climate change","level":2,"score":0.40996938943862915},{"id":"https://openalex.org/C110872660","wikidata":"https://www.wikidata.org/wiki/Q37813","display_name":"Ecosystem","level":2,"score":0.4044564664363861},{"id":"https://openalex.org/C62649853","wikidata":"https://www.wikidata.org/wiki/Q199687","display_name":"Remote sensing","level":1,"score":0.37201160192489624},{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.2810623049736023},{"id":"https://openalex.org/C19269812","wikidata":"https://www.wikidata.org/wiki/Q26540","display_name":"Satellite","level":2,"score":0.24833795428276062},{"id":"https://openalex.org/C153294291","wikidata":"https://www.wikidata.org/wiki/Q25261","display_name":"Meteorology","level":1,"score":0.16106903553009033},{"id":"https://openalex.org/C2780376076","wikidata":"https://www.wikidata.org/wiki/Q1499458","display_name":"Vegetation Index","level":4,"score":0.13248077034950256},{"id":"https://openalex.org/C18903297","wikidata":"https://www.wikidata.org/wiki/Q7150","display_name":"Ecology","level":1,"score":0.11991283297538757},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.08776906132698059},{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.07321935892105103},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.07213732600212097},{"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/C71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","level":0,"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/C142724271","wikidata":"https://www.wikidata.org/wiki/Q7208","display_name":"Pathology","level":1,"score":0.0}],"mesh":[],"locations_count":2,"locations":[{"id":"pmh:oai:lup-student-papers.lub.lu.se:2158922","doi":null,"is_oa":false,"landing_page_url":"http://lup.lub.lu.se/student-papers/record/2158922","pdf_url":null,"source":{"id":"https://openalex.org/S4306402420","display_name":"Lund University Publications Student Papers (Lund University)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I187531555","host_organization_name":"Lund University","host_organization_lineage":["https://openalex.org/I187531555"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"H2"},{"id":"mag:1702043263","doi":null,"is_oa":false,"landing_page_url":"https://lup.lub.lu.se/student-papers/record/2158922/file/2373934.pdf","pdf_url":null,"source":null,"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":null}],"best_oa_location":null,"sustainable_development_goals":[{"score":0.7605999708175659,"display_name":"Life on land","id":"https://metadata.un.org/sdg/15"},{"score":0.5351999998092651,"display_name":"Climate action","id":"https://metadata.un.org/sdg/13"}],"study_designs":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":94,"referenced_works":["https://openalex.org/W59064917","https://openalex.org/W114697379","https://openalex.org/W147958375","https://openalex.org/W360616926","https://openalex.org/W574712229","https://openalex.org/W635499589","https://openalex.org/W877331703","https://openalex.org/W1505401644","https://openalex.org/W1600741091","https://openalex.org/W1685527236","https://openalex.org/W1702514756","https://openalex.org/W1739499426","https://openalex.org/W1739656754","https://openalex.org/W1740937167","https://openalex.org/W1751644603","https://openalex.org/W1767373221","https://openalex.org/W1792055624","https://openalex.org/W1793587539","https://openalex.org/W1837731159","https://openalex.org/W1857134844","https://openalex.org/W1861233814","https://openalex.org/W1867456794","https://openalex.org/W1874139044","https://openalex.org/W1883573567","https://openalex.org/W1895341313","https://openalex.org/W1937622479","https://openalex.org/W1968250753","https://openalex.org/W1969111669","https://openalex.org/W1974047452","https://openalex.org/W1975999098","https://openalex.org/W1979743603","https://openalex.org/W1981978730","https://openalex.org/W1985688288","https://openalex.org/W2000563894","https://openalex.org/W2003893975","https://openalex.org/W2004421470","https://openalex.org/W2008889095","https://openalex.org/W2012133636","https://openalex.org/W2012656566","https://openalex.org/W2013518317","https://openalex.org/W2013972395","https://openalex.org/W2014650317","https://openalex.org/W2016521059","https://openalex.org/W2017012156","https://openalex.org/W2017203650","https://openalex.org/W2018636632","https://openalex.org/W2021218961","https://openalex.org/W2022725676","https://openalex.org/W2024509631","https://openalex.org/W2027135335","https://openalex.org/W2030240884","https://openalex.org/W2030297232","https://openalex.org/W2033510830","https://openalex.org/W2034351363","https://openalex.org/W2037029862","https://openalex.org/W2040859008","https://openalex.org/W2045324886","https://openalex.org/W2045368311","https://openalex.org/W2051564354","https://openalex.org/W2054502362","https://openalex.org/W2067577121","https://openalex.org/W2071978272","https://openalex.org/W2072093516","https://openalex.org/W2072834400","https://openalex.org/W2078078152","https://openalex.org/W2080537593","https://openalex.org/W2080868907","https://openalex.org/W2090600964","https://openalex.org/W2091336710","https://openalex.org/W2094059506","https://openalex.org/W2098059510","https://openalex.org/W2098455129","https://openalex.org/W2100504811","https://openalex.org/W2102953485","https://openalex.org/W2109010315","https://openalex.org/W2110976780","https://openalex.org/W2113410727","https://openalex.org/W2117291451","https://openalex.org/W2117895576","https://openalex.org/W2121025662","https://openalex.org/W2123610463","https://openalex.org/W2126250722","https://openalex.org/W2127263025","https://openalex.org/W2136390132","https://openalex.org/W2138751033","https://openalex.org/W2144927855","https://openalex.org/W2151011640","https://openalex.org/W2153316607","https://openalex.org/W2154700052","https://openalex.org/W2155728864","https://openalex.org/W2155962616","https://openalex.org/W2176956584","https://openalex.org/W2902313739","https://openalex.org/W3157300356"],"related_works":["https://openalex.org/W7097822885","https://openalex.org/W7217202113","https://openalex.org/W2162167454","https://openalex.org/W7106583596","https://openalex.org/W4366003828","https://openalex.org/W7099230112","https://openalex.org/W3198931066","https://openalex.org/W4210786648","https://openalex.org/W1998146648","https://openalex.org/W1994623745"],"abstract_inverted_index":{"Phenological":[0,16],"vegetation":[1,24,52,61,77,91],"characteristics":[2,17],"are":[3,18,29,63],"valuable":[4],"inputs":[5],"to":[6,31,89,158,166,237,273],"several":[7],"ecosystem-related":[8],"models:":[9],"including":[10],"carbon":[11],"exchange":[12],"and":[13,28,34,40,53,98,104,111,116,130,165,205,219,252,261],"climate":[14],"change.":[15],"effective":[19],"measures":[20],"of":[21,72,95,147,181,191,207,212,230,240,248,277,287],"changes":[22,50,92,172],"in":[23,25,51,114,163,197,217],"an":[26,195],"area":[27],"subject":[30],"the":[32,45,67,96,123,160,179,185,192,198,203,208,231,238,246,274,278,288,295,304],"seasonal":[33],"inter-annual":[35],"climatic":[36],"variations.":[37],"In":[38,56,66,257],"arid":[39],"semi-arid":[41],"ecosystems,":[42],"precipitation":[43],"is":[44,255,283],"main":[46],"driving":[47],"factor":[48,286],"for":[49,93,122,140,228],"phenological":[54,117,168],"parameters.":[55,169],"this":[57],"regard,":[58],"remotely":[59],"sensed":[60],"indices":[62],"widely":[64],"used.":[65],"current":[68],"study,":[69],"time":[70],"series":[71,146],"16-day":[73],"composite":[74],"normalized":[75],"difference":[76],"index":[78],"(NDVI)":[79],"images":[80],"from":[81,134,144],"Moderate":[82],"Resolution":[83],"Imaging":[84],"Spectroradiometer":[85],"(MODIS)":[86],"were":[87,120,156,173,225,264],"analyzed":[88],"assess":[90],"parts":[94],"Sudan":[97],"Chad":[99],"(between":[100],"10o-20o":[101],"Northern":[102],"latitude":[103],"23o-35o":[105],"Eastern":[106],"longitude)":[107],"during":[108],"2000-2010.":[109],"Spatial":[110],"temporal":[112,260,267],"variation":[113,268,282],"NDVI":[115,164],"(seasonality)":[118],"parameters":[119,143],"assessed":[121],"land":[124],"cover":[125],"classes":[126],"shrubland,":[127],"grassland,":[128],"cropland":[129],"savanna.":[131],"Mathematical":[132],"models":[133],"TIMESAT,":[135],"a":[136,145,285],"program":[137],"package":[138],"developed":[139],"extracting":[141],"seasonality":[142],"data":[148],"captured":[149],"using":[150],"remote":[151],"sensing":[152],"techniques":[153],"over":[154],"time,":[155],"implemented":[157],"suppress":[159],"noisy":[161],"patterns":[162],"extract":[167],"The":[170,266,280],"observed":[171,305],"then":[174],"explained":[175],"by":[176],"looking":[177],"at":[178],"amount":[180,300],"rainfall.":[182,279],"Even":[183,293],"though":[184],"results":[186,251,296],"cannot":[187,302],"be":[188,235,271],"generalized,":[189],"majority":[190],"cases":[193],"depict":[194,297],"increase":[196,245],"fitted":[199],"NDVI,":[200],"delay":[201],"on":[202],"start":[204],"end":[206],"growing":[209,213],"seasons,":[210],"shortening":[211],"season":[214],"length,":[215],"decrease":[216],"amplitude":[218],"integrals.":[220],"However,":[221],"statistical":[222],"test":[223],"outputs":[224],"not":[226],"significant":[227],"most":[229],"cases.":[232],"This":[233],"could":[234,269],"due":[236],"effect":[239],"small":[241],"sample":[242],"sizes,":[243],"which":[244],"likelihood":[247],"obtaining":[249],"erroneous":[250],"further":[253],"inspection":[254],"recommended.":[256],"general,":[258],"high":[259],"spatial":[262,281],"variations":[263],"evident.":[265],"mainly":[270],"attributed":[272],"erratic":[275],"nature":[276],"also":[284],"strong":[289],"north-south":[290],"rainfall":[291,299],"diversity.":[292],"so,":[294],"that":[298],"only":[301],"explain":[303],"changes.":[306]},"counts_by_year":[{"year":2012,"cited_by_count":9}],"updated_date":"2026-10-27T15:51:10.671819","created_date":"2016-06-24T00:00:00"}