排序方式: 共有306条查询结果,搜索用时 15 毫秒
271.
Chen Shangji Li Binglan Yao Shiyu Du Bing National Marine Data Information Service SOA Tianjin People''s Republic of China 《地理学报(英文版)》1997,(3)
I.IntroductionInthedivisionofhydroclimaticarea,howtoselecttheprincipalclimaticfactorswhichmayinfluencethedistributionofhydroclimatictypeisanimportantproblemtoeffectthereliabilityoftheresultofdivisionofhydroclimaticarea.Ingeneral,theclimaticcharacterist… 相似文献
272.
Model of Reflection Spectra of Rock Surface in 2π Space 总被引:5,自引:0,他引:5
ZHAO Hongying ZHAO Hu YAN Lei ZHAO YunshengInstitute of Remote Sensing GIS Peking University Beijing Beijing Key Lab of Spatial Information Integration Its Applications Institute of RS GIS Peking University Beijing Department of Geography Northeast Normal University Changchun Jilin 《《地质学报》英文版》2004,78(3):843-847
This paper deals with reflection spectra and polarized reflection spectra of 20 sorts of rock in 2π space, and then creates a model of reflection spectra of rock surface in 2π space. We measured the change of reflection and polarized reflection spectra as altering the incidence angle, vertex angle, azimuth angle, band and polarization. The results show that influence of the incidence angle on spectral curves is very strong. And when the vertex angle is constant, the horizontal azimuth polarizes rock spectra, and distorts the circular spectrum to become elliptic. The polarization influences the reflection intensity of rock spectra, but has no evident influence on the characteristics of wave forms of rock in 2π space. Therefore, we can describe the whole reflection spectral characteristics, including polarization, of rock surface in 2π space by measuring and calculating the e and p values in several key directions. 相似文献
273.
274.
TAO Chuang LIN ZongjianTAO Chuang Doctoral Candidate School of Information Engineering WTUSM Wuhan China 《地球空间信息科学学报》1998,(1)
We are involved in an embarrassing situation that the limited capa-bility of automated feature extraction in digital photogrammetric systems cannotsatisfy the increasing needs for rapid acquisition of semantic information for appli-cations.Facing this challenge,a new tactic,Human-Computer Collaborative(HCC)tactic,and a corresponding new method,Operator-Object Directed(OOD)method,are proposed for the design of a system for feature extractionfrom large scale aerial images.We hold that in almost all technical complex sys-tems,full automation will be neither technically feasible nor socially acceptable.The system should be designed to optimize through the cooperative operation withtwo agents in the system:the human and the computer. 相似文献
275.
276.
对我国西北和东北(内蒙古东部)36个地点的新生代-现代陆相咸化湖泊沉积中的433块标本进行了采样分析,在其中15个地点38块标本中发现钙质超微化石10个属:Coccolithus, Reticulofenestra, Cyclicargolithus,Quadrum, Discoaster, Gephyrocapsa, Calcidiscus, Umbilicasphaera,Cotonocyclus, Watznaueria等,多数为原地沉积,也有一部分属于再沉积来源。由此可见,不能笼统地把所有钙质超微化石的发现都当作海相或海侵的证据。陆相咸化湖泊沉积中钙质超微化石的特点是:丰度低,数量稀少;属种分异度低;常与陆相喜盐水生生物共生。第四系和现代陆相咸化湖泊沉积中发现的钙质超微化石属种往往是海相第四系或现代海洋中常见类型。在青海柴达木盆地七个泉构造七心1井中-上始新统下干柴沟组上段岩心中,发现Reticulofenestra bisecta。这是海相中始新世-渐新世沉积中标志化石。看来,利用钙质超微化石进行海、陆相地层对比探索已取得一定进展,但离“统”一级的地层对比还有很大距离。 相似文献
277.
遥感影像的存储与管理是当前急待解决的问题。文中基于ORACLE数据库中典型数据类型的分析,提出并实现了遥感影像存储的3种不同途径和方法。 相似文献
278.
机载SAR图像定向参数的F.LDT解法 总被引:1,自引:1,他引:1
从SAR图像的F.Leberl构像模型出发,推导了成像载体匀速运动条件下的SAR图像定向参数的直接变找(Direct Transformation for F.Leberl Model。F.LDT)解法。通过比较F.LDT解法与F.Leberl构像方程线性代迭代解法的实验结果,得出结论:F.LDT解法可以满足精度要求,且无需初值,不需迭代,计算过程简单,避免了线性化迭代方法不收敛的情况。最后对影响F.LDT解法精度的因素进行了分析。 相似文献
279.
280.