基于DEM的机助航空摄影技术设计(英文)   总被引：1，自引：0，他引：1  

范业稳  龚健雅  谭成国  王瑞幺 《地球空间信息科学学报》2008,11(1):26-30

In aerial photography, the primary factor is terrain undulation. However, most of the external aerial photography software used for aerial photography design do not take terrain undulation influence into consideration. Therefore, the design result has comparative randomicity and ＂gaps＂ are expected. An aerial photography design system is developed by analyzing the terrain undulation influence to the design result with DEM data so that the forward overlap and side overlap can be justified according to the block terrain undulation to meet specifications or standards. The data designed by this system is compared with the real flying data. The results show that making use of DEM to assist in aerial photography design can ensure that the designed result fits the real terrain better.  相似文献   

地震映像法及其应用   总被引：7，自引：0，他引：7  

王治华  仇恒永  杨振涛  夏学礼 《物探与化探》2008,32(6)

简述了地震映像法的特点,并列举了在各种浅部不均体探测中的应用实例,指出了提高其应用效果,拓宽其应用领域应研究的问题。  相似文献   

Apartheid spatial engineering and land use change in Mankweng, South Africa: 1963–2001     

BRENT McCUSKER  MARUBINI RAMUDZULI† 《The Geographical journal》2007,173(1):56-74

Land use change studies permeate the geographic literature. While these studies have helped researchers understand the dynamics and importance of such changes, they have less often taken a deeper historical approach in combination with their traditional strengths of geographic information analysis. In this study, we explore historical land use changes in one of South Africa's former bantustans, Lebowa, from 1963 to 2001. We argue that changes in land use arise from both current socioeconomic dynamics but also from historical precedent established by the apartheid regime. Our methods couple historical aerial photography to recent household surveys to elucidate the national, regional and local influences over land use change. We conducted extensive field research in the study site between 2003 and 2006. Our findings show a high degree of urbanization, a loss of grassland and agricultural land and a dramatic pattern of increasing spatial concentration near growth points. We outline three recommendations for policymakers planning post-apartheid rural spaces and conclude with future research needs.  相似文献   

火箭触发闪电通道的亮度特征分析   总被引：2，自引：0，他引：2  

吕伟涛  张义军  周秀骥  孟青  郑栋  马明  王飞  陈绍东  郄秀书 《气象学报》2007,65(6):983-993

利用成像速率为2000幅/s的高速摄像资料,对采用不同触发方式的两次负极性闪电进行了对比分析,结果表明:空中触发方式的上行正先导的起始速度比经典触发方式的低一个量级左右,而前者的触发高度要比后者的高;闪电通道中金属导线汽化部分的余晖时间可达160—170 ms,相对来说,空气离化部分的亮度信息更能真实体现闪电通道中的电流特性。依据闪电通道亮度变化特性的差异,并结合电场变化的观测,可以将回击之后的过程分为3种类型,没有M分量的为连续衰减型,有M分量的可分为独立型和延续型两种,能够与不同类型的延续电流波形相对应。总体上看,有M分量的回击间隔比没有M分量的要长,几何平均值分别为77 ms和37 ms,有M分量的初始连续电流也会比没有M分量的持续更长的时间。回击和M分量发生前闪电通道的相对亮度存在明显的差异,回击前闪电通道的相对亮度很弱,甚至观测不到任何发光现象,而M分量发生前闪电通道仍有较强的发光。  相似文献   

DMC数字航摄在大比例尺地形图成图中的应用     

王辛之  杨林德  江王记 《地理空间信息》2007,5(3):5-7

数字航空摄影具有从测量到成图的全过程数字化的优点。结合1∶2000地形图DMC全数字摄影测量项目对面阵CCD航摄像机用于大比例尺航测成图的基本要求进行了分析研究,提出数字像机的几何标定、数字摄影的质量检验和生产作业规范制订的必要性。  相似文献   

Black Rock by Peter Goin and Paul Starrs     

Jacob Sowers 《The Professional geographer》2006,58(4):502-503

  相似文献   

数字摄像能见度仪器系统控制电路的设计     

王京丽刘旭林  高五峰高峰 吴蕾李伟  刘国宏 《气象科技》2006,34(5):633-637

数字摄像能见度仪器系统(DPVS)是完全仿照人工目测能见度的方法测量能见度的,比传统的透射式、散射式能见度仪更具客观性。为了说明DPVS在硬件方面的工作原理,从该仪器系统的控制电路原理、电路详细构成、元器件的选配、电路设计思路以及系统在实际运行中出现的一些问题和解决方法等方面做了详细介绍。同时还对控制电路中应用的单片机的部分软件做了简要介绍。  相似文献   

开放型摄影测量实验基地的设计与建立   总被引：1，自引：1，他引：0  

龚涛  冉将军  冯威  孔健 《测绘科学》2010,35(3)

摄影测量技术的学习和掌握离不开实验。文中提出建立开放型摄影测量实验基地模式,该基地应该具有如下功能:航空摄影,航测控制测量与调绘,数码相机检校,航测内业处理与测图。在该基地上,学生可以根据摄影测量的学习内容,选择相关实验项目,理论联系实际地学习掌握摄影测量基本理论和方法;学生也可以在基地上自主设计、模拟摄影测量生产过程,训练摄影测量技能,并进行摄影测量试验研究。该实验基地的设计理念和建立模式,将为高校现有摄影测量课程的教学和实验提供一种创新形式。  相似文献   

Snow process monitoring in montane forests with time‐lapse photography          下载免费PDF全文

Chunyu Dong  Lucas Menzel 《水文研究》2017,31(16):2872-2886

A camera network with hourly resolution was used to monitor the complex snow processes in montane forest environments. We developed a semi‐automatic procedure to interpret snow depths from the digital images, which exhibited high consistency with manual measurements and station‐based recordings. To extract snow interception dynamics, six binary classification methods were compared. The MaxEntropy classifier demonstrated better performance than the other methods under conditions of varying illumination and was therefore selected as the method used for quantifying snow in tree canopies. Snow accumulation and ablation on the ground, as well as snow loading and unloading in the forest canopies, were investigated using snow parameters derived from the time‐lapse photography monitoring. The influences of meteorologic conditions, forest cover, and elevation on the snow processes were also considered. Time‐lapse photography proved to be an effective and low‐cost approach for collecting useful information on snow processes and facilitating the set‐up of hydrological models.  相似文献   

无人机近景摄影支持下的古建筑三维建模     

刘洋  廖东军  王朝刚  谭钿  刘云锋  后腾辉 《测绘通报》2020,(11):112-115

三维建模已经广泛应用于文物保护、工程测量、城市服务、应急救灾、林业保护等多个方面。本文结合实际工程经验，对多旋翼无人机近景摄影的古建筑物三维建模进行了研究，提出了一种自主飞行结合手动多高度、多角度拍照的古建筑三维建模方法，并通过多个试验场景，验证了三维模型的精度和质量。同时，引入地面布设的控制点，利用空中三角测量及密集匹配技术，进而获得古建筑上各个特征点的三维坐标，为近景摄影测量在古建筑物变形监测方面的研究提供了新的思路。  相似文献