Improvement of astronomical refraction by mapping function     

Hao-jian Yan 《Chinese Astronomy and Astrophysics》1998,22(4):200-496

In this paper we used the method of generator function to gave an improved mapping function of astronomical refraction, separately for optical and radio frequencies. We included a complete consideration of the corrections introduced by the physical and geophysical factors required in astronomy and space techniques. We used sounding balloon data to assess the actual accuracy of our corrected refraction formula. The result is 5″ at elevation 2° and 1″ at elevation 5°. We believe that the main factor that limits the accuracy is departure of the model atmosphere from the real atmosphere.  相似文献   

地面伽马能谱测量在我国地质填图中的初步应用   总被引：4，自引：1，他引：4  

贾文懿  魏彪  唐红  苗放  周蓉生 《物探与化探》1996,20(4):295-298

近年来,由于核技术的发展和认识的转变,地面γ能谱测量等放射性方法在我国地质填图工作中已得到广泛应用。本文介绍地面伽马能谱测量等放射性方法在我国地质填图中的作用及应用情况。  相似文献   

成象光谱图象光谱吸收鉴别模型与矿物填图研究   总被引：1，自引：0，他引：1  

王晋年  郑兰芬  童庆禧 《遥感学报》1996,(1)

本文提出了一种光谱吸收鉴别模型，拟通过矿物光谱吸收特征的鉴别，在成象光谱上实现矿物直接识别与填图。该模型的核心是光谱吸收指数技术（ＳＡＩ）。从理论上探讨了ＳＡＩ的本质，应用Ｈａｐｋｅ光谱模型讨论了ＳＡＩ与光谱吸收系数（ｄ）以及单散射反照率（ｗ）之间的函数关系，并从成象光谱图象辐射信息传递过程分析了图象ＳＡＩ与光谱吸收深度的关系，而光谱吸收深度与岩石矿物成分含量之间具有定量关系，这显示了ＳＡＩ提取矿物定量遥感信息能力。ＳＡＩ已经成功地应用于ＦＩＭＳ、ＭＡＩＳ和ＧＥＲＩＳ图象处理与矿物填图，本文通过哈图、塔里木、以及澳大利亚松谷的实例研究，表明ＳＡＩ是一种有效的提取矿物类型与丰度信息的方法。  相似文献   

战场数字化建设与军事测绘新技术集成     

李汉如  王家耀 《测绘学院学报》1996,(2)

本文阐述了战场数字化的基本概念及其对军事测绘的要求，分析了地理信息系统（ＧＩＳ）、遥感（ＲＳ）和全球定位系统（ＧＰＳ）等军事测绘新技术及其集成的功能，以及它们在战场数字化建设中的作用。  相似文献   

浅谈遥感技术在1:5万区调中的应用   总被引：1，自引：0，他引：1  

刘刚  于学政 《国土资源遥感》1997,8(1):14-19

本文以内蒙苏尼特左旗地区1:5万遥感地质填图工作为例,阐述了遥感技术在1:5万区域地质调查各个阶段中的工作内容和工作方法,从而对遥感技术在区调中的作用进行了评述,并展望了遥感、地理信息系统、全球定位系统在区调中的应用前景。  相似文献   

魏晋南北朝测绘史考     

王树连 《测绘工程》1997,6(3):40-45

概述魏晋南北朝时期的测绘管理及职官设置，疆域测量了及地图绘制，天文观测及其新发现等史实，勾画出了这一时期测绘发展的轮廓。  相似文献   

Coincidence and spatial variability of geology,soils, and vegetation,mill run watershed,Virginia     

C. G. Olson  C. R. Hupp 《地球表面变化过程与地形》1986,11(6):619-629

The Mill Run watershed is a structurally-controlled synclinal basin on the eastern limb of the Massanutten Mountain complex of northwestern Virginia. Bedrock contacts are obscured by coarse sandstone debris from exposures near basin divides. Colluvium blankets more than half the basin, masking geomorphic surfaces, affecting vegetation patterns, and contributing to the convexity of the alluvial, terrace, pediment and erosion surfaces. Examination of the bedrock geology, geomorphology, soils and vegetation shows distinct distributional correspondences. Vegetation is strongly interdependent with geomorphology, bedrock geology, and soils. On convex colluvial slopes, mixed hardwood forests are most common. In concave coves and deep gorges, mixed hardwoods are replaced by conifers. In thin colluvium, in poorly developed soils, and on blockfields, chestnut oak is singularly prevalent. Conifers dominate shaley bedrock areas. Soils and surficial sediments have a major effect on near-surface hydrology. During wet seasons, cemented horizons in the subsurface cause temporary saturation in the superjacent horizons; lateral movement of soil-water effectively eliminates a vertical component of ground-water recharge. Vegetation is strongly dependent on water availability and thus reflects the distribution of subsurface barriers and sediment-soil fades changes.  相似文献   

An interpolation method taking into account inequality constraints: I. Methodology   总被引：1，自引：0，他引：1  

Olivier Dubrule  Clement Kostov 《Mathematical Geology》1986,18(1):33-51

Several kinds of data can provide information about a variable measured on a one- or two-dimensional space; at some points, the value is known to be equal to a certain number. At other points, the only information may be that the variable is greater or smaller than a given value. The theory of splines provides interpolating functions that can take into account both equality and inequality data. These interpolating functions are presented. The parallel between splines and kriging is reviewed, using the formalism of dual kriging. Coefficients of dual kriging can be obtained directly by minimizing a quadratic form. By adding some inequality constraints to this minimization, an interpolating function may be calculated which takes into account inequality data and is more general than a spline. The method is illustrated by some simple one-dimensional examples.Work performed at Sohio Petroleum Company  相似文献   

分布式多源地理信息交换系统体系研究     

范延平  祝国瑞 《测绘信息与工程》2005,30(4):27-29

参照OGC的有关规范标准,对分布式多源地理信息交换系统体系结构模型进行了初步研究,给出了多源地理信息交换系统的工作原理和实现方法。  相似文献   

继承先生遗志献身祖国测绘事业--纪念夏坚白先生诞辰100周年暨首届颁发夏坚白教授测绘事业创业奖     

张儒杰 《现代测绘》2003,26(5):3-5,8

夏坚白先生诞辰100周年暨首届颁发夏坚白教授测绘事业创业奖活动即将在江苏省常熟市展开。本文以崇敬的心情介绍了夏坚白先生的生平和为测绘事业所做的突出贡献。  相似文献