航空重力测量的偏心改正     

孙中苗  夏哲仁  肖云  李迎春 《武汉大学学报(信息科学版)》2003,(Z1)

导出了航空重力测量偏心改正的实用计算公式 ,利用某航空重力测量实测数据 ,计算了位置、速度和加速度的偏心改正 ,并对垂直加速度、厄特弗斯改正、水平加速度改正和空间改正的偏心影响进行了详细分析 ,讨论了偏心改正对偏心距、姿态角的测定精度要求。  相似文献   

机载激光遥感成像的激光回波波形数字化技术   总被引：2，自引：0，他引：2  

胡以华  王建宇  薛永祺 《遥感学报》2001,5(2):110-113

首先介绍了机载遥感成像技术的基本原理，讨论了其关键组成部分的地面目标激光回波波形数字化电路的设计及其组成特点，叙述了该波形数字化电路的时序设计和数据存储结构，最后讨论了波形数字化结果的数据预处理方法及相关问题，得到了系统试验运行中获取的激光回波的有关预处理结果，它们将作为进一步生成地面三维图像和目标分类的数据源。  相似文献   

冶金地质系统航空物探工作三十年          下载免费PDF全文

线纪安 《地质与勘探》2001,37(3):36-40

从冶金地质航空物探工作队伍的目的，工作队伍的变化，所完成工作量的分析，飞行器材及导航定位系统使用状况，各种航空物探方法实施情况等几个方面，论述了冶金地质系统航空物探工作30年来技术发展过程，取得的成就及前景。  相似文献   

航空物探和航天遥感技术在环境评价中的应用现状   总被引：1，自引：0，他引：1  

王怀武  韩长青 《铀矿地质》2001,17(2):125-128

本文介绍了航空物探和遥感技术在环境评价中的应用前提和应用领域，列出了在碍国内外应用研究的实例，充分说明该技术是环境评价前期阶段缩小靶区最重要的手段之一，具有快速、低廉等特点，受到各国广泛重视和采用。  相似文献   

Evaluation of Lidar and Medium Scale Photogrammetry for Detecting Soft-Cliff Coastal Change   总被引：3，自引：0，他引：3  

James Adams  & Jim Chandler 《The Photogrammetric Record》2002,17(99):405-418

Lidar and photogrammetry have both been evaluated for detecting shortterm coastal change using the Black Ven mudslide, Dorset as a case study. A lidar-generated digital elevation model (DEM) was obtained and initially compared with a DEM generated using available 1:7500 scale aerial photography and automated digital photogrammetry. The quality of these two data sets was assessed using a third DEM, derived using a total station and conventional ground survey methods. The vertical accuracies (rms error) of the lidar and photogrammetry were 0.26m and 0.43m respectively, although both data sets displayed a tendency to generate heights slightly lower than the elevation of the terrain surface. The quality of the two data sets was then assessed with respect to local slope angle. The accuracy of photogrammetrically derived elevations varied with slope and more so than in the case of lidar
From these basic tests, lidar has proved to be more accurate than photogrammetry for soft-cliff. monitoring. Further research is required to establish whether this trend is applicable to other data sets and specifically for photogrammetric data acquired using larger scale imagery  相似文献   

Ozone and PAN Formation Inside and Outside of the Berlin Plume – Process Analysis and Numerical Process Simulation     

U. Corsmeier  N. Kalthoff  B. Vogel  M.-U. Hammer  F. Fiedler  Ch. Kottmeier  A. Volz-Thomas  S. Konrad  K. Glaser  B. Neininger  M. Lehning  W. Jaeschke  M. Memmesheimer  B. Rappenglück  G. Jakobi 《Journal of Atmospheric Chemistry》2002,42(1):289-321

During the BERLIOZ field phase on 20 July 1998 a 40 km wide ozone-plume 30 to 70 km north of Berlin in the lee of the city was detected. The ozone mixing ratio inside the plume was app. 15 ppb higher than outside, mainly caused by high ozone precursor emissions in Berlin, resulting in a net chemical ozone production of 6.5 ppb h^–1, which overcompensates ozone advection of –3.6 ppb h^–1 andturbulent diffusion of –1.1 ppb h^–1. That means, although moreozone leaves the control volume far in the lee of Berlin than enters it at the leeside cityborder and although turbulent diffusion causes a loss of ozone in the leeside control volume the chemical production inside the volume leads to a net ozone increase. Using a semi-Lagrangian mass budget method to estimate the net ozone production, 5.0 ppb h^–1 are calculated for theplume. This means a fraction of about 20% of ozone in the plume is producedby local emissions, therefore called `home made' by the Berlin emissions. For the same area KAMM/DRAIS simulations using an observation based initialisation, results in a net production rate between 4.0 and 6.5 ppbh^–1, while the threefold nested EURAD model gives 6.0 ppbh^–1. The process analysis indicates in many cases goodagreement (10% or better) between measurements and simulations not only in the ozone concentrations but also with respect to the physical and chemical processes governing the total change. Remaining differences are caused by different resolution in time and space of the models and measurements as well as by errors in the emission calculation.The upwind-downwind differences in PAN concentrations are partly similar to those of ozone, because in the BERLIOZ case they are governed mainly by photochemical production. While in the stable boundary layer at night and windward of Berlin 0.1 to 0.3 ppb are detected, in the centre of the plume at noon concentrations between 0.75 ppb and 1.0 ppb are measured. The O₃/PAN ratio is about 80 to 120 and thus due to the relatively lowPAN concentrations significantly higher than found in previous studies. The low PAN formation on 20 July, was mainly restricted by the moderate nonmethane hydrocarbon levels, whereas high PAN concentrations of 3.0 ppb on 21 July, are caused by local production in the boundary layer and by large scale advection aloft.  相似文献   

青藏高原中西部板块缝合带航磁特征   总被引：5，自引：7，他引：5  

姚正煦  周伏洪  薛典军  刘振军  张永军 《物探与化探》2002,26(3):165-170

在青藏高原上发现的几条板块缝合带,均能见到以基性超基性岩为主的蛇绿岩分布,它们中的多数在青藏高原中西部1:100万航磁图上都有不同程度的反映,按其分布特征大致可分为3类,供鉴别缝合带参考。  相似文献   

航空放射性测量   总被引：3，自引：0，他引：3  

刘裕华  顾仁康  候振荣 《物探与化探》2002,26(4):250-252

介绍了核工业航测遥感中心在寻找铀矿工作中的航空放射性测量的设备、经验和技术方法,已获得375.8万km²的航空放射性测量数据,在寻找铀矿和辐射环境评价中都取得理想的成果,并对石家庄市、秦山核电站周围地区天然放射性水平航空检测结果与高压电离室测量结果进行了对比;笔者着重阐述并建议将该中心在40多年勘查铀矿获得的航空放射性测量数据及其设备开发用于环境本底辐射评价、寻找丢失的点源和核事故应急航空监测。  相似文献   

环境航空测量数据的处理与解释   总被引：2，自引：0，他引：2  

李兵海  郑圻森 《物探化探计算技术》2002,24(3):249-253

作者讨论了大气污染的现状，对比航空测量和地面监测的优缺点，提出了一套环境航空测量数据的处理方法，并讨论了各类参数的具体含义及关系。  相似文献   

影响机载激光扫描测高精度的系统误差分析   总被引：20，自引：1，他引：20  

刘经南  张小红  李征航 《武汉大学学报(信息科学版)》2002,27(2):111-117

简要介绍了机载激光扫描测高技术的系统组成和发展现状，通过坐标转换技术建立起机载激光扫描对地定位的基本几何关系，并从这些几何关系出发，着重分析了动态偏心改正及动态时效误差对机载激光测高精度的影响，对不同的误差源如何影响定位结果的精度进行了讨论，最后给出模拟计算结果，得出了一些有益的结论。  相似文献