摘要
Background:Thedistributionofforestvegetationwithinurbanenvironmentsiscriticallyimportantasitinfluencesurbanenvironmentalconditionsandtheenergyexchangethroughtheabsorptionofsolarradiationandmodulationofevapotranspiration.Italsoplaysanimportantrolefilteringurbanwatersystemsandreducingstormwaterrunoff.Methods:WeinvestigatethecapacityofALSdatatoindividuallydetect,mapandcharacterizelarge(tallerthan15m)treeswithintheCityofVancouver.LargetreesarecriticalforthefunctionandcharacterofVancouver'surbanforest.WeusedanobJect-basedapproachforindividualtreedetectionandsegmentationtodeterminetreelocations(positionofthestem),todelineatetheshapeofthecrownsandtocategorizethelattereitherasconiferousordeciduous.Results:Resultsindicateadetectionrateof76.6%fortrees>15mwithapositioningerrorof2.11m(stemlocation).ExtractedtreeheightspossessedaRMSEof2.60mandabiasof-1.87m,whereascrowndiameterwasderivedwithaRMSEof3.85mandabiasof-2.06m.Missedtreesareprincipallyaresultofundetectedtreetopsoccurringindense,overlappingcanopieswithmoreaccuratedetectionanddelineationoftreesinopenareas.Conclusion:ByidentifyingkeystructuraltreesacrossVancouver'surbanforests,wecanbetterunderstandtheirroleinprovidingecosystemgoodsandservicesforcityresidents.
出版日期
2018年04月14日（中国期刊网平台首次上网日期，不代表论文的发表时间）
