Multiscale Roughness Analysis of Particles: Application to the Classification of Detrital Sediments     

Hervé Drolon  Bernard Hoyez  Fabrice Druaux  Alain Faure 《Mathematical Geology》2003,35(7):805-817

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黄河流域夏季分区面雨量预报研究   总被引：6，自引：0，他引：6  

许力  刘强 《南京气象学院学报》2003,26(1):116-123

介绍黄河流域分区夏季面雨量预报的研究成果，精心挑选51个具有较好代表性的测站对黄河流域夏季降水的时空演变特征进行分析，使用K均值动态聚类对黄河流域的夏季降水进行了客观分区，并计算出各流域夏季面雨量。通过对黄河流域夏季雨量与500hPa环流，海温、OLR、中纬阻高，高原积雪，欧亚积雪等重要影响因子的关系分析，结合黄河流域夏季面雨量年降和年代际演变特征的分析，研究出黄河流域分区夏季面雨量预测的基本方法和模型，并通过客观化的数学方法建立黄河流域夏季面雨量预测系统，预测系统十年回报的结果显示出具有较的预测技巧。  相似文献   

日照市短时冰雹定时-定点-定量预报          下载免费PDF全文

王繁强陆桂荣  周秀君张文琴 于怀征 《气象科技》2003,31(4):220-222

利用1960～2000年青岛、射阳、徐州3站08时探空资料及日照站08时地面气象资料，分析了日照地区出现的16次降雹天气的时空分布特征，在对降雹天气分型的基础上利用积云数值模式计算降雹因子，用降雹因子和单站要素因子建立历史降雹因子个例库，用历史实况资料建立实况个例库，用距离相似法实现日照地区短时冰雹定时、定点、定量的客观预报。  相似文献   

飞行物体虚拟环境仿真系统的研究   总被引：2，自引：0，他引：2  

管华  王双亭等 《测绘学院学报》2003,20(1):29-31,38

概述了飞行物体虚拟环境仿真系统包含的主要技术，重点讨论了虚拟环境中视景系统构建的关键问题，如场景建模、模型驱动及视点的控制与变换等。  相似文献   

黑龙江省湿地资源遥感信息解译分析   总被引：6，自引：0，他引：6  

杜春英  王育光  高永刚  石剑  杨晓强 《黑龙江气象》2003,(3):1-3

按黑龙江省湿地分类标准，应用资源卫星遥感技术，建立湿地资源解译标准，判别分析全省湿地资源现状与区域分布。  相似文献   

多时相Radarsat数据在广东肇庆地区稻田分类中的应用   总被引：11，自引：2，他引：11  

刘浩  邵芸  王翠珍  Brian Brisco  Gordon Staples 《国土资源遥感》1997,8(4):1-6,13

将1996年获取的4个时相的Radarsat图像用于广东肇庆地区的稻田分类试验,结果表明,多时相Radarsat数据对水稻类型的识别精度较高,而且稻田的轮作规律容易推测出来。本文系统地介绍了这一试验研究的最新进展,探讨了神经网络分类方法在SAR图像处理中的应用潜力和Radarsat数据在中国南方水稻监测中的最佳时相选择和有效分辨率问题。  相似文献   

利用TM数据快速提取含矿蚀变带方法研究   总被引：47，自引：5，他引：47  

马建文 《遥感学报》1997,1(3):208-213,224

热液蚀变岩类是在含矿热液作用下引起原岩化学成分和物理性质发生变化的结果，因此蚀变岩类往往与内生产矿产伴生，有时其本身就是含矿体。不同蚀变矿特级组合具有独特的光谱响应，但是光谱的反射和吸收产特征较弱称为遥感找矿弱信息标志。  相似文献   

Shorelines of the Uppsala Esker East-Central Sweden: Their Use as Indicators of Regional Differences in Shore Displacement     

Lars-Erik &#;se 《Geografiska Annaler: Series A, Physical Geography》1997,79(1-2):67-81

About 750 different shoremarks, mainly shore terraces, have been levelled along the Uppsala esker. Using various methods it has been possible to arrange the shoremarks to shorelines or rather shoremark zones containing more shoremarks than intervening parts. The material was divided into two major parts, i.e. shoremarks below c . 15 m above sea level and shoremarks above c . 15 m. It was found that shorelines on the whole were sloping towards the north. This was expected because of the faster shore displacement in the northern part of the area. However, the shorelines below c . 15 m a.s.l. indicated a slower increase in shore displacement than those of higher altitudes. A conclusion drawn from this might be that the increase towards the north is retarded in the area around Lake Mälar. This result is in reasonable agreement with recent isobase systems constructed from the evidence of mareograph records and repeated precise levellings. On the other hand, the shoreline studies give evidence of more pronounced regional differences in shore displacement in earlier Litorina times than those found today.  相似文献   

观赏石的分类与审美   总被引：2，自引：0，他引：2  

赖绍民 《四川地质学报》1996,(3)

从观赏石是自然形成的具有观赏价值的石质艺术品这一认识出发，将观赏石分为造型石、图纹石、矿物晶体石、古生物化石、纪念石和特殊石６大类。又以观赏石的地域审美观为指导，从色泽、形态、图纹、质感、组合、使巧、命名和意境８个方面对观赏石的审美进行了探讨。  相似文献   

The Best Natural Boundary:a New Concept Developed by Combining the Sequence Boundary with the GSSP     

Mei Shilong China U niversity of Geosciences  Beijing 《《地质学报》英文版》1996,70(1):98-107

Through a detailed study of sequence boundaries, it is concluded that sequence stratigraphy is an independent regional and transitional stratigraphic system between local lithostratigraphy and global chronostratigraphy. Therefore, a new tripartite stratigraphic classification scheme has been proposed. By combining organically the concept of sequence boundaries with the GSSP, it is suggested that the GSSP should be chosen in a conformale portion of a related sequence boundary, and the boundary established in light of this concept is defined as the Best Natural Boundary (BNB). The definition of the BNB points out the working area and stratigraphic level for the GSSP. By referring to a case study of the Permian Guadalupian/Lopingian boundary, the concept of the BNB has been elaborated in detail, and it is proposed that the BNB of the Guadalupian and the Lopingian lies between the Mesogondolella granti Zone and the Ctarkina postbitteri Zone, which is also the sequence chronostratigraphic boundary between th  相似文献