我国城市测量技术发展现状与成就   总被引：1，自引：0，他引：1  

洪立波 《测绘工程》1998,7(3):1-6

介绍我国城市测量技术发展的现状,着重介绍测绘新技术在城市测量中的应用与实际效果,阐述测量技术基础建设的成就。  相似文献   

A revised DDO abundance calibration for population I red giants     

A. E. Piatti  J. J. Clariá  D. Minniti 《Journal of Astrophysics and Astronomy》1993,14(3-4):145-165

Several arguments that justify establishing a revised abundance calibration for DDO photometry of population I red giants are presented. The components of the blanketing vector in the DDOC(45–48) vsC(42–45) diagram are determined for late-type dwarfs and giants. We have redefined the DDO cyanogen anomaly and calibrated it against metallicity. The sample of field giants now available with abundances derived from high dispersion spectroscopy is substantially larger than previously available, leading to a more accurate abundance calibration. Iso-abundance lines in theC(41–42) vsC(42–45) diagram have been determined for population IG and K giants and an iterative method for deriving abundances of these stars is described. We show that the new DDO abundances are in very good agreement with those derived from high dispersion spectroscopy. The new method improves by about 0.1 dex the DDO abundances derived for early G and/or late K giants, with respect to the δCN method of Janes (1975).  相似文献   

Absolute and geometric parameters of the W UMa type contact binary V546 And     

《New Astronomy》2015

  相似文献   

Photometric and spectroscopic investigation of the oscillating Algol type binary: EW Boo     

《New Astronomy》2015

We obtained the physical and geometrical parameters of the EW Boo system, which exhibits short period and small amplitude pulsations as well as brightness variations due to orbital motion of components. Towards this end we carried out photometric observations at Ankara University Kreiken Observatory (AUKO) as well as spectroscopic observations at TUBITAK National Observatory (TNO). The light and radial velocity curves obtained from these observations have been simultaneously analyzed with PHOEBE and the absolute parameters of the system along with the geometric parameters of the components have been determined. Using model light curves of EW Boo, light curve regions in which the pulsations are active have been determined and as a result of analyses performed in the frequency region, characteristic parameters of pulsations have been obtained. We find that the results are compatible with current parameters of similar systems in the literature. The evolutionary status of the components is propounded and discussed.  相似文献   

区域地下水动态观测网优化的组合克立金方法     

仵彦卿 《地球科学与环境学报》1995,(1)

本文推导出了普通二变量及泛二变量组合克立金方程式．同时，给出了两种方法的估计误差标准差求解方程，可用于地下水动态观测网的密度优化；该方法还可用于地下水位、水中离子浓度的最优估计．  相似文献   

灰霾天气变化特征及垂直交换系数的预报应用   总被引：6，自引：0，他引：6  

廖碧婷  吴兑  陈静  李菲  陈欢欢  刘运策  黄晓莹 《热带气象学报》2012,28(3):417-424

利用1998—2008年广东省广州、东莞和增城的常规气象资料及2004年6月10日—2008年12月30日Micaps 3.0的K指数、沙氏指数和L指数资料,重点分析了这三个地方10—12月的灰霾天气变化特征。研究结果表明,增城的能见度比例主要集中在大于10 km的范围内,空气质量最好,东莞的空气质量最差。广州和东莞10—12月的能见度等级百分比分布形态类似,轻微灰霾天气所占频率较大,其中10月占的比例最高。并提出垂直交换系数试图对污染物的垂直输送能力进行评估,进而尝试对灰霾天气进行预报。结果表明当垂直交换系数小于15 000时,城市容易出现灰霾天气,反之则说明该地的空气质量较为良好。  相似文献   

Adaptive Optics Image Restoration Based on Frame Selection and Multi-frame Blind Deconvolution     

TIAN Yu  RAO Chang-hui  WEI Kai 《Chinese Astronomy and Astrophysics》2009

Restricted by the observational condition and the hardware, adaptive optics can only make a partial correction of the optical images blurred by atmospheric turbulence. A postprocessing method based on frame selection and multi-frame blind deconvolution is proposed for the restoration of high-resolution adaptive optics images. By frame selection we mean we first make a selection of the degraded (blurred) images for participation in the iterative blind deconvolution calculation, with no need of any a priori knowledge, and with only a positivity constraint. This method has been applied to the restoration of some stellar images observed by the 61-element adaptive optics system installed on the Yunnan Observatory 1.2m telescope. The experimental results indicate that this method can effectively compensate for the residual errors of the adaptive optics system on the image, and the restored image can reach the diffraction-limited quality.  相似文献   

长江三峡工程库区生态环境遥感动态监测   总被引：5，自引：1，他引：5  

周乐群  孙长安  高改萍  胡甲均  胡宗云  杨岚 《国土资源遥感》2005,16(1):49-52

长江三峡工程库区人类活动频繁,生态系统脆弱,三峡工程对库区生态环境的影响一直是人们关注的焦点。运用遥感、地理 信息系统、全球卫星定位系统、计算机网络技术,采用DEM 、影像正射校正、多源影像数据融合、多层次信息提取等技术方法,对整 个库区20世纪80年代中期、90年代末期生态环境、草地资源进行了全面的动态监测,并在此基础上利用ArcGIS软件开发完成了“长江 三峡工程库区生态环境遥感动态监测GIS系统”。  相似文献   

汀溪水库三维防洪调度管理信息系统研发     

彭国均  池天河  张新  陈世真  林跃翔 《地球信息科学学报》2007,9(6):82-87

水库防洪调度是一个非常复杂的过程。水库防洪调度的信息化主要是借助测量、遥测、遥感(RS)、地理信息系统(G IS)、全球定位系统(GPS)等手段采集基础数据,构建数字化水库防洪数据管理平台和水库虚拟三维环境。在该平台和环境中,以系统软件和数学模型对水库流域的水雨情及洪水的调度方案进行模拟、分析和研究,提供决策支持,从而增强防洪调度决策的科学性和预见性。实践表明,通过RS、GIS技术建立的水库三维防洪调度系统能够为水库管理者提供水库防洪调度方案制定与分析、防洪调度决策等方面的强有力的、科学的辅助支持。本文结合厦门"汀溪水库三维防洪调度系统"的实际研发,探讨了RS和GIS技术在水库防洪调度中的应用。  相似文献   

裂缝性潜山油藏储集体岩性定量识别———以埕北30 太古界潜山储集体为例   总被引：3，自引：1，他引：2  

周英杰  张敬轩  张吉昌  武强 《中国岩溶》2002,21(2):140-144

由于油井取芯费用高昂加之油层保护的需要,不可能大量取芯,因此利用少量的岩芯资料,结合其它一些手段来预测未取芯井段的岩性,就成为有效识别和预测潜山储层分布的重要途径之一。该文针对埕北30 太古界潜山储集体,运用BP神经网络技术对测井资料进行了潜山储集体岩性的定量识别,经与岩芯观察、薄片分析、成像测井结果对比检验, 符合率达到了90%,从而为开展潜山油藏裂缝预测研究奠定了基础。   相似文献