福建省基础地理信息数据库共享方案研究     

叶荣青 《测绘标准化》2008,(3):19-21

大量专业和基础性空间数据存在于个别组织及机构内部,由于数据格式、管理平台不同等原因造成不易共享。通过 FME 数据格式转换平台和 ISM 数据库管理中间平台的技术分析,结合福建省基础地理信息数据库共享实际模式,提出的基础地理信息数据库共享方案,为空间信息网络共享、交换和整合提供了技术参考。  相似文献   

测绘监理体系架构及应用研究——以南京市大比例尺矢量地形图基础测绘项目为例     

叶斌  王芙蓉  李爱民  诸敏秋 《测绘通报》2008,(9)

针对南京市大比例尺矢量地形图基础测绘项目,架构并细化了具有南京特色的全过程"五二一三"(五控制、二管理、一协调、三评价)测绘监理体系以及配套的测绘监理文档.并通过理论联系实践,将其应用到白2004年以来开展的多轮次南京市大比例尺矢量地形图基础测绘项目中.使其在实践中不断得到完善、深化和发展.实践证明.南京市测绘监理体系是科学的、有效的、可行的,其应用取得了较大的经济效益和社会效益,其建立促进了南京市测绘项目管理的进一步发展.  相似文献   

Analysis of the Airborne Laser Scanning Bathymetry Errors     

YE Xiu-song  ZHANG Chuan-ding  WANG Ai-bing  JIAO Cheng 《测绘科学技术学报》2008,25(6)

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数字电子水准仪检定方法的研究   总被引：1，自引：0，他引：1  

叶晓明  阙江 《测绘通报》2008,(11)

针对目前数字电子水准仪的检验仍然拘泥于光学模拟水准仪检验方法的现状,提出以完全根据仪器示值来评价水准仪精度性能的检验方法.  相似文献   

An essay on the interactions between climate and society     

Michael H  GLANTZ  Qian YE 《Frontiers of Earth Science》2008,2(3):356-363

There has been increasing concern about the lack of involvement by social scientists and humanists in a global change program, although many social scientists are already directly involved in various aspects of research on environmental change, and their research interests are clearly central to a global change research agenda. Based on a historical review, the role of social science disciplines as well as social science institutes in an emerging multidecadal global change program is discussed. Both “plan of action” and “plan of inaction” are suggested to avoid potential pitfalls due to the rush development of a social science program into the existing global climate change problem.  相似文献   

机载激光水深测量误差分析   总被引：4，自引：1，他引：3  

叶修松  张传定  王爱兵  焦诚 《测绘科学技术学报》2008,25(6)

详细分析了机载激光水深测量的各种误差,着重讨论了IMU姿态测量误差对机载激光定位的影响。根据实际可能的误差数据,并联合扫描角误差、测距误差和平台坐标系原点误差进行计算分析,得出了不同的量测误差对目标3维定位误差的综合影响。  相似文献   

Flows,flares, and formation of umbrae and light bridges in BBSO region No. 1167     

Harold Zirin  Haimin Wang 《Solar physics》1990,125(1):45-60

We present high-resolution observations of the large active region BBSO No. 1167 (Boulder No. 5060) which cast new light on the structure of sunspot regions. We obtained excellent data, highlighted by videomagnetograms (VMG) obtained with our 65-cm telescope, which give unprecedented spatial resolution, about 0.5' for much of two 11-hr periods. This permitted us to see details of the field evolution and flows in the AR. The H filtergrams and D3 filtergrams permit study of these magnetic changes compared to spots and chromospheric structure.The region was a huge but simple active region (CMP July 2, 1988) in which we observed rapid flux emergence for several days. Because the new flux generally matched the old, there were few large flares. However, there were 14 flares on June 28 and 29, mostly in two sites. The first site was a spot which already existed when the active region appeared on the east limb. This site showed little change of magnetic structure during our observing period. The second site is an area disturbed by new flux emergence, which included a spot which formed and disappeared in two days, and a rapidly moving p spot. Flares ocurring at one site almost always produced footpoints at the other. The delay between flash phases of the same flare at the two sites ranges from 40 to 160 s.The magnetograms show complex fine structure, with some closely interwined regions of opposite polarity. In a region of new flux emergence, positive (leading polarity) flux flows along elongated channels immersed in the negative flux. Moving magnetic features occur around all of the spots.We point out other interesting aspects of this large region: (1) While there is extensive penumbra around the main umbrae, there is also significant penumbra apparently unrelated to any spot. These unusual penumbrae are either due to flux returning to the surface, flux left behind by the moving umbra, or associated with pores that appear and disappear. (2) We observed umbrae to move faster than the accompanying penumbrae, and concluded that penumbrae are not a simple extension of the umbra. (3) We found that combining spots of the same polarity do not completely merge, but are always separated by a thin light bridge. This means that the emerging flux loops are discrete entities.  相似文献   

土壤天然热释光测量在寻找滑坡体边界中的应用研究   总被引：1，自引：1，他引：1  

张丽娇  叶树林  刘庆成 《工程地质学报》2006,14(6):815-818

土壤天然热释光测量方法是一种累积型测氡方法。由于累积测氡时间长,其灵敏度和异常的重现性远比一般累积测氡及其子体方法好,因此,在地质领域得到了广泛的应用。在寻找滑坡体边界的应用中,取得的测量效果明显,表明该方法经济有效。  相似文献   

新疆库鲁克塔格地区二叠纪脉岩群岩石地球化学特征，Nd、Sr、Pb同位素组成与岩石成因   总被引：12，自引：22，他引：12       下载免费PDF全文

姜常义姜寒冰  叶书锋夏明哲 逯东霞 《地质学报》2005,79(6):823-833

库鲁克塔格地区二叠纪脉岩群非常发育,主要岩石类型是辉绿岩,并有少量的斜闪煌斑岩、斜长玢岩和花岗斑岩。花岗斑岩属高钾钙碱性系列,具有A型花岗岩的稀土元素和微量元素地球化学特征;斜长玢岩的地球化学特征与花岗斑岩相似,二者都亏损U、Nb、Ta。斜闪煌斑岩的岩石化学组成属过碱性系列,显著富集轻稀土元素和大离子亲石元素。辉绿岩的岩石化学组成以钙碱性系列为主,稀土元素总量变化较大,Cs、Rb、Ba、Th元素丰度变化大,普遍亏损U、Nb、Ta。研究证明,辉绿岩脉的这些地球化学特征都与同化混染作用有关,大离子亲石元素丰度的变化还与热液蚀变有关。辉绿岩具有富集型Nd、Sr同位素组成,且变化范围大,是岩浆源区同化混染作用的结果。它们的铅同位素组成属低U(Th)/Pb值的正常铅,主要受混染物控制,并不代表源区特征。库鲁克塔格地区岩石圈地幔Nd、Sr、Pb同位素比塔里木板块西缘岩石圈地幔的富集程度更高,且变化范围大,反映了这两个地区岩石圈地幔的演化历史存在明显差异。  相似文献   

镉的地球化学研究现状及展望   总被引：13，自引：0，他引：13  

叶霖潘自平  李朝阳刘铁庚 夏斌 《岩石矿物学杂志》2005,24(4):339-348

镉是重金属有毒元素,其环境污染一直是众多学者研究的焦点。近年来研究发现,镉等分散元素并不“分散”,它在特定的条件下会富集,甚至形成独立矿床或矿体,因此有必要对镉等分散元素的地球化学行为进行重新认识和再研究。本文介绍了有关镉的分布和赋存状态的一些研究进展,总结了我国镉矿资源的分布及特点和地球化学研究现状,提出应加强镉的超常富集机制、铅锌矿床表生地球化学过程中镉的释放及其对环境的影响方面的研究。  相似文献