超文本电子地图集系统     

游涟  胡鹏 《武汉大学学报(信息科学版)》1995,(1)

介绍了超文本电子地图集系统ＨＥＡＳ的若干概念，分析了现有地理信息系统的优点和弱点，介绍了超文本电子地图集系统的特性和武测超文本电子地图集实验系统方面的研究成果。  相似文献   

High-Pressure and Ultrahigh-Pressure Metamorphic Belt in Tongbai-Dabie Mountains,Central China     

Zhang Zeming You Zhendong Han Yujing Yang Weiran Wei BizeFaculty of Earth Sciences  China University of Geosciences  Wuhan 《中国地质大学学报(英文版)》1995,(2)

There are four units of high-pressure to ultrahigh-pressure metamorphism extending from south to north across the Tongbai-Dabie Mountains: the epidote-blueschist-facies unit, the low-temperature eclogite facies unit , the ultrahigh-pressure eclngite facies unit and the medium-temperature eclogite facies unit . The later two units were formed during the Caledonian subduction between the Tongbai-Dabie microplate and the North China plate ,the former two units are the products of Indosinian continental-continental subduction and collision between the Yangtze and the North China plates.  相似文献   

IP效应对电磁感应响应的影响研究     

游子余 《矿产与地质》1993,7(2):140-151

严密的推理和大量精确的计算结果,揭示了IP效应对EM响应的影响.在野外常见的极化条件下,在电磁法工作频率范围(1～1000Hz)内,绝对影响过极大值.相对影响可达10%以上.充电率m越大.极化时间常数T对球体本身的感应时间常数r之比越小、频率响应系数c越小.影响越大,山响的频率越高.  相似文献   

桂东南破碎带蚀变岩型金银矿床成矿规律和找矿标志   总被引：3，自引：0，他引：3  

耿火辉  李赋屏 《矿产与地质》1993,7(3):183-187

桂东南混合岩区破碎带蚀变岩型金银矿床在混合岩田高、低级变质带过渡部位成矿,与燕山期混合花岗岩关系密切,赋矿空间为NE-NNE向构造断裂破碎带,常含方铅矿、闪锌矿、黄铁矿等金属硫化物.宽大的蚀变破碎带和黄铁绢英岩化蚀变是找矿的直接标志.  相似文献   

Geospatial technologies for Chang’e-3 and Chang’e-4 lunar rover missions     

Kaichang Di  Zhaoqin Liu  Wenhui Wan  Man Peng  Bin Liu  Yexin Wang 《地球空间信息科学学报》2020,23(1):87-97

ABSTRACT

This paper presents a brief overview of the geospatial technologies developed and applied in Chang’e-3 and Chang’e-4 lunar rover missions. Photogrammetric mapping techniques were used to produce topographic products of the landing site with meter level resolution using orbital images before landing, and to produce centimeter-resolution topographic products in near real-time after landing. Visual positioning techniques were used to determine the locations of the two landers using descent images and orbital basemaps immediately after landing. During surface operations, visual-positioning-based rover localization was performed routinely at each waypoint using Navcam images. The topographic analysis and rover localization results directly supported waypoint-to-waypoint path planning, science target selection and scientific investigations. A GIS-based digital cartography system was also developed to support rover teleoperation.  相似文献   

Direct Observations of Atmospheric Transport and Stratosphere-Troposphere Exchange from High-Precision Carbon Dioxide and Carbon Monoxide Profile Measurements     

You YI  Zhaonan CAI  Yi LIU  Shuangxi FANG  Yuli ZHANG  Dongxu YANG  Yong WANG  Miao LIANG  Maohua WANG 《大气科学进展》2020,37(6):608-616

The balloon-borne Aircore campaign was conducted in Inner Mongolia,China,on June 13 and 14 2018,which detected carbon dioxide(CO_2) and carbon monoxide(CO) profiles from surface to 24 km,showing strong positive and negative correlations between 8 km and 10 km on 13 and 14 June,respectively.Backward trajectories,meteorological analyses,and CO_2 horizontal distributions were combined to interpret this phenomenon.The results indicated that the source region experienced a stratospheric intrusion and exhibited a large horizontal CO_2 gradient;namely,lower CO concentrations corresponded to higher CO_2 concentrations and vice versa.The laminar structure with multiple origins resulted in the highly negative correlation between CO_2 and CO in the upper troposphere on 14 June.The contribution of stratospheric air mass to the upper troposphere and that of tropospheric air mass to the lower stratosphere were 26.7% and24.3%,respectively,based on a mass balance approach.Another interesting phenomenon is that CO_2 and CO concentrations increased substantially at approximately 8 km on 13 June.An analysis based on the backward trajectory implied that the air mass possibly came from anthropogenic sources.The slope of CO_2/CO representing the anthropogenic sources was 87.3 ppm ppm~(-1).In addition,the CO_2 profile showed that there was a large CO_2 gradient of 4 ppm km-1 within the boundary layer on 13 June,and this gradient disappeared on 14 June.  相似文献   

Analysis of the spectrum of the coronal condensation of the total eclipse of 1983 June 11     

Li Hui  You Jian-qi 《Chinese Astronomy and Astrophysics》1993,17(4):431-441

We analyzed the spectrum of a coronal condensation observed during the total eclipse of 1983 June 11. Under the assumption of rotational symmetry we found the distributions of the electron density and the temperature. The electron density was higher in the centre of the condensation than on the edge. From different line pairs the maximum electron density was found to be between 1.7 3.5×10⁹cm⁻³ while the temperature was found to be basically uniform at 1.7 2.7×10⁶K. The turbulence velocity was 15 35km/s. The systematic flow of the condensation region with respect to the quiet corona was not more than 15km/s. Discussion of the instrumental profile showed that its effect was small on lines that were much wider than the profile.  相似文献   

Radio spectra of synchrotron sources with spherical symmetry     

You Jun-han 《Chinese Astronomy and Astrophysics》1983,7(4):315-321

This paper deals with the radio spectra of synchrotron sources with spherically symmetric non-homogeneities. It is pointed out that the Type-c spectra can be produced by such a non-homogeneity even if the source is optically thin. This model is particularly advantageous in interpreting sources with no compact characteristics and yet showing a Type-c spectrum, and the observed decrease in source size with increasing frequency. In addition, it is possible to give a uniform interpretation of the four spectral types on the basis of such a non-homogeneity.  相似文献   

试论中国重要景观区区域地球化学异常系统评价的量化模型   总被引：11，自引：2，他引：9  

朱有光  蒋敬业  李泽九  李方林  欧阳建平 《物探与化探》2002,26(1):17-22

在对中国5个重要景观区1:20万金、铜表生地球化学异常特征进行总结、对比,并讨论景观、表生因素对区域异常评价标志影响的基础上,进一步充实、完善了区域异常系统评价体系的思路和评价准则,提出了区域地球化学异常系统评价的量化模型。  相似文献   

中国地质科学50年的简要回顾   总被引：2，自引：1，他引：1  

王鸿祯  石宝珩 《地质论评》2000,46(1):1-7

在世界之效科学技术大发展的现阶段,中国地质科学必将发展,因为它具箅了社会需求、科学问题和社会基础技术三个科学发展的条件。由于中国地质学奠基者的远见卓识,中国地质学在本世纪２０～３０年代已建立了世界声誉。新中国建立后,５０～７０年代中国地质科学取得迅速工。自７０年代珂至今的改革开放时期更取得了全面的发展。随着地球系统科学的新概念为广大地质学者所接受,地质学各分支学科必将走向互相交驻融合,形成综合的和  相似文献