Progress in the Development of a High Performance Airborne Digital Sensor   总被引：1，自引：0，他引：1  

P. Fricker  R. Sandau  & A. S. Walker 《The Photogrammetric Record》2000,16(96):911-926

Joint development work by LH Systems and Deutsches Zentrum für Luft- und Raumfahrt (German Aerospace Center) has produced encouraging results using forward, nadir and backward looking linear arrays on the focal plane to provide panchromatic imagery and geometric information, supplemented by further arrays to acquire multispectral imagery suitable for both high precision photogrammetric mapping and image processing for interpretative purposes. The geometric characteristics of line scanner imagery necessitate line-by-line rectification for aircraft tilts and shifts. Satisfactory execution of this process is enhanced by using supplementary data from high performance, on-board GPS and inertial measurement systems. Similarly, high demands are placed on other sub-systems, such as the camera mount, lens, electronics and storage technology. In addition to rectification for aircraft tilts and shifts, rectification for terrain characteristics is also required in order to generate colour and false colour composite images, since the various multispectral arrays are in different places on the focal plane. The special geometry affects triangulation. Thereafter, the imagery can be processed using existing software packages from both photogrammetry and remote sensing.
The concept has been demonstrated in several successful test flights and the production model is scheduled for market introduction at the ISPRS Congress in July 2000. The imagery from the new sensor will fulfil many market requirements between the highest resolution film imagery (<0.1 m) and high resolution space imagery (1m to 10 m). The sensor's unique blend of multispectral information with high quality geometric information will give rise to numerous new applications.  相似文献   

数字钻孔摄像在小浪底帷幕灌浆检测孔中的应用   总被引：3，自引：0，他引：3  

魏立巍  秦英译  唐新建  王川婴 《岩土力学》2007,28(4):843-850

为了评价帷幕灌浆效果,将数字钻孔摄像技术应用到小浪底水利枢纽3号灌浆洞3个灌浆质量检查孔中。通过数字钻孔摄像得到的孔壁图像资料, 对钻孔内发育的节理裂隙、破碎带和砂浆充填情况进行了分析研究,结果表明：?灌浆时浆液在外压下,主要沿连通性较好、延伸较远的裂隙向孔外岩体渗透。与渗流路径相连通的裂隙或延伸较短的裂隙,被浆液直接充填凝固后形成水泥结石。与渗流路径没有连通的裂隙则被忽略,或在灌浆压力下劈裂而部分充填,造成全充填、半充填和砂浆流出等几种充填效果;?破碎带充填与否主要与破碎带的规模、性质和与灌浆洞连通性有关。小浪底水利枢纽3号灌浆洞内的灌浆效果是明显的;将数字钻孔摄像技术应用于检查帷幕灌浆质量,分析灌浆浆液渗流路径,也是可行的。  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   

航空摄影测量实习基地的建设与实践     

杨朝辉  袁铭  张序  连达军  何继峥 《测绘与空间地理信息》2014,(12)

结合我校摄影测量实习教学现状与现有的软硬件仪器设备情况,通过选择合适的野外实习场地,建立航空摄影模拟场、数码相机检校场与航测内业实验室,设计合理的实习项目,最终完成航空摄影测量实习基地的建设.基地的建设与实践提高了摄影测量课的教学质量,锻炼了学生的实践动手能力,满足了应用型创新人才培养的要求.  相似文献   

CCD卫星相机时间序列定标:以CBERS02B为例     

高海亮  顾行发  余涛  李小英  巩慧  李家国 《测绘学报》2011,40(2):180-187

采用沙漠场景法、稳定目标法和交叉定标法对CBERS02B星的CCD相机开展时间序列定标,分别得到CCD相机2007-2008年期间三种方法对应的定标系数,并同CBERS02B卫星官方提供的定标系数进行比对.结果表明,三种方法得到的定标系数其误差均小于10%,不同方法的结果具有较好的一致性.最后,分析总结各种时间序列定标...  相似文献   

几种相机检校方法的探讨     

何敏  全斌 《测绘与空间地理信息》2011,(6):275-277

相机技术参数的检校是保证成果质量能否满足精度要求的关键问题之一。本文主要对常用的几种检校方法进行归纳,通过对实验数据的对比分析,找出优缺点,得出结论,为以后相机检校方法进一步的探讨提供一定的帮助。  相似文献   

DENIS: A deep near-infrared survey of the southern sky     

N. Epchtein  B. De Batz  E. Copet  P. Fouqué  F. Lacombe  T. Le Bertre  G. Mamon  D. Rouan  D. Tiphène  W. B. Burton  E. Deul  H. Habing  J. Borsenberger  M. Dennefeld  A. Omont  J. C. Renault  B. Rocca Volmerange  S. Kimeswenger  I. Appenzeller  R. Bender  T. Forveille  F. Garzon  J. Hron  P. Persi  M. Ferrari-Toniolo  I. Vauglin 《Astrophysics and Space Science》1994,217(1-2):3-9

The DENIS project is the first attempt to carry out a complete digitized survey of the southern sky in the range 1–2.5µm. The main objectives of the programme and the main specifications of the camera and of the data processing stream are briefly outlined  相似文献   

增强现实系统中虚拟与现实信息空间视觉匹配的算法研究     

刘秀坤  杜清运 《测绘科学》2007,32(5):27-29

本文在对相机成像原理研究的基础上,通过一台数码相机从不同方向拍摄的两幅或两幅以上二维图像,实现实际空间坐标和数码相机像平面坐标的透视变换,建立现实空间坐标系与像素坐标系之间的变换关系,并推导出通过相机校准来确定相机参数的数学过程。通过这个算法可以解决虚实的视觉匹配问题,为增强现实系统提供基本支持。最后还通过实验验证算法的正确性。  相似文献   

基于普通数码像片的相关系数影像匹配方法探讨   总被引：2，自引：0，他引：2  

杨立君  何凯 《北京测绘》2007,(2):5-8

普通数码相机是非量测相机,所获取的像片属于近景像片,但像片没有已知的内方位元素且影像变形大,因此普通数码像片的图像处理比较特殊。针对普通数码像片特点及相关系数计算量大的特点,本文根据试验提出了一种匹配的准确率高、速度快的改进的相关系数匹配方法。试验表明该匹配方法在影像变形较大的情况下有较快的匹配速度和较高的准确度。  相似文献   

一种基于网格的数码相机数字化图像纠正拼接算法     

郭丙轩  王文进  刘波  王铁程 《测绘科学》2007,32(6):143-145

随着数码相机的不断普及和数字化图书馆建设步伐的加快,利用数码相机对文档文件进行数字化成为一种趋势,但采用数码相机进行数字化时,由数码相机的镜头造成的几何畸变给数字化后的图像拼接带来一定的困难。为了纠正这种几何畸变,提高数码相机数字化的质量,本文提出一种基于网格的图像纠正拼接算法。该算法首先通过计算每个网格的变形参数来纠正图像的几何畸变,再逐个网格来进行图像拼接。试验表明,该算法能对数码相机数字化的文档类图像进行批量的纠正拼接,并且计算速度快,精度高,拼接效果好等优点,为文档类文件用数码相机进行数字化提供了一定的技术支持。  相似文献