Lewang_tree 定量遥感班课件.pdf

Object-Based Methods for Individual TreesTrees IdentificationIdentification andand TreeTree SpeciesSpecies Classification from High-Spatial RResollutiion IImagery 王乐 副教授（终身教授），研究生主任 纽约州立大学布法罗分校地理系纽约州立大学布法罗分校地理系 美国国家地理信息分析中心 lewang@buffalo.edu Introduction IntroductionIntroduction TreeTreeTreeTree IdentificationIdentificationIdentificationIdentification Tree ClassificationTree Classification High Spatial Resolution ConclusionsConclusionsConclusionsConclusions Imagery and Future DevelopmentFuture Development ObjectObject-BasedBased MethodsMethods Multiscale CharacterizationMultiscale Characterization Forest IndividualIndividual TreesTrees StandStand ForestForestForestForest InventoryInventoryInventoryInventory ParametersParametersParametersParameters •• Tree densityTree density •••• CrownCrownCrownCrown closureclosureclosureclosure •• Timber volumeTimber volume •• DBH (Diameter at Breast Height)DBH (Diameter at Breast Height) •••• BasalBasalBasalBasal areaareaareaarea •• Tree heightTree height •• Tree SpeciesTree Species Forest Inventory MeasurementsForest Inventory Measurements (three stages)(three stages) 1. Late 18th Century – : Field measurements • Labor-intensive, time- consumiing • Inconsistent results • Constrained to small unitsunits ofof forestforest 2. Mid 1940s2. Mid 1940s –– now: