分享到:

植被覆盖度的照相法测算及其与植被指数关系研究

植被覆盖度(Vegetation Coverage,简称VC)是衡量地表植被状况的一个最重要的指标,同时,它又是影响土壤侵蚀的主要因子。植被覆盖及其变化是全球和区域生态环境变化的重要指示。而植被覆盖度测量方法的改进以及测量精度的提高是各领域发展的需要。无论地表实测方法还是遥感相关模型,都因为技术的进步和应用的需求而对相关领域的研究提出了新的要求。本文在国家自然基金项目“SPOT图像信息提取与土地利用/土地覆盖识别与监测研究”(编号:40371053)的资助下,以南京市主城区及其周边农田为研究区,从该区SPOT和ETM+两幅卫星图像提取的各种植被指数中,选取使用最为广泛的归一化植被指数(NDVI)作为遥感植被指标;野外调查与遥感成像时间准同步,累计20余天、行程数百公里,以亚米级精度的差分GPS获取几何控制点和所有实测样方的经纬度数据;用植被覆盖度地表实测方法中最为精确的数码照相法,结合传统的目估法,获取样方植被覆盖度;最后建立了  (本文共137页) 本文目录 | 阅读全文>>

《Journal of Forestry Research》2018年05期
Journal of Forestry Research

Forest type identification by random forest classification combined with SPOT and multitemporal SAR data

IntroductionAccurate classification of forest type is fundamental to thestudy of forest resources,forest dynamics,forest biomass,and carbon storage estimation.The use of remote sensingto aid forest type classification is increasingly important invirtually all aspects of forest research.Examples of remote sensing data used for forest typeclassification include TM and SPOT optical images.Thesetypes of imagery yield dat...  (本文共8页) 阅读全文>>

《Acta Oceanologica Sinica》2007年02期
Acta Oceanologica Sinica

Analysis on coral reefs mapping using SPOT5 data at the Dongsha Atoll

1 IntroductionCoral reefs are a complexmarine ecosystemthatis constructed and maintained by biological commu-nities that thrive in the warm, sunlit tropical ocean.The ecosystem of coral reefs is rich in biodiversity.It is a biological index on the health of marine re-sources, and also an index of marine water quality.Coral reefs provide a shelter for marine biota fromtropical storms and may be characterized as impor-...  (本文共10页) 阅读全文>>

《China Standardization》2004年04期
China Standardization

China Initiates Voluntary Certification of Public Security Products

ReporterslearnedfromtheCertificationandAccreditationAdministrationofChina(CNCA)thatburglar-proofdoorbecamethefirstbatchofvoluntarycertificationproductinpublicsecurityproducts.Chinahasformallyinitiatedvol-untarycertificationofpublicsecurityproducts.RatifiedbytheCertificationandAccreditationAdministrationofChina,andtheMinistryofPublicSecurity,theSecurityTechnologyPreventionCertificationCenterofChinahasundertakentocondu...  (本文共1页) 阅读全文>>

《Semiconductor Photonics and Technology》2003年02期
Semiconductor Photonics and Technology

Measurement of the Waveguide Near-field Optical Spot

1 IntroductionEvanescentenergycanbeusedtogetextremelysmallopticalspots .Forthedatastorageapplications,opticalnearfieldisdefinedintermsofevanescentcouplingbetweenthesystemusedtoreadorwritethedataandrecordinglayer .Near -fieldtechniquescanbeappliedtoopticaldatastoragesystemsto greatlyincreaserecordingdensity .Itcannotonlybeutilizeddirectlyinnearfieldopticalrecording ,butalsoinhybridrecording ,whichcanheattherecordingme...  (本文共5页) 阅读全文>>

《Wuhan University Journal of Natural Sciences》2003年01期
Wuhan University Journal of Natural Sciences

Studies of Several Systems with Air Electrode Electro-Synthesizing H_2O_2 on the Spot for Degr ading Aniline in Aqueous

0 IntroductionThemethodofmineralizingorganictoxicantsinthewastewaterbygenerating·OHradicalshasbecomefocusofchemicaltheoriesandtechnicalresearchesintheenvironmentprotection[1] .Because·OHradicalisastrongoxidizerwithstandardpotentialof2 .80V ,withit,thestableandevenmanyorganicmolecules,whicharehardlydegradedbybiochemicalmethod ,canbedegradedintosimplymineralssuchasCO2 ,H2 O ,etc .Themethodsofdegradingtheorganictoxicant...  (本文共6页) 阅读全文>>