共查询到20条相似文献，搜索用时 31 毫秒
1.
《ISPRS Journal of Photogrammetry and Remote Sensing》1999,54(5-6):332-341
This paper deals with the orientation of three-line imagery which has been taken during the MOMS-02/D2 experiment in spring 1993, and during the MOMS-2P/PRIRODA mission since April 1996. The reconstruction of the image orientation is based on a combined adjustment of the complete image, ground control, orbit and attitude information. The combined adjustment makes use of the orientation point approach or the orbital constraints approach. In the second case, the bundle adjustment algorithm is supplemented by a rigorous dynamical modeling of the spacecraft motion. The results of the combined adjustment using MOMS-02/D2 imagery and control information of orbit #75b are presented. Based on the orientation point approach an empirical height accuracy of up to 4 m (0.3 pixel) is obtained. In planimetry the empirical accuracy is limited to about 10 m (0.7 pixel), since the ground control points (GCP) and check points could not be identified in the imagery with the required accuracy. Computer simulations on MOMS-2P/PRIRODA image orientation based on realistic input information have shown that good accuracies of the estimated exterior orientation parameters and object point coordinates can be obtained either with a single strip and a few precise GCP or even without ground control information, if a block of several overlapping and crossing strips with high geometric strength (q≈60%) is adjusted. 相似文献
2.
时间延迟积分电荷耦合器件(TDI CCD)交错拼接推扫相机,是指焦平面上交错成两行排列多个TDI CCD阵列,并采用推扫成像方式的光学相机。为兼顾空间分辨率与地面覆盖宽度,当前较多的高分辨率光学遥感卫星都搭载了此类相机。本文总结了此类相机的成像原理和特点,基于成像瞬间多片CCD共享一套外方位元素的特点构建了该类相机的"整体几何模型"。针对定位过程中的外部误差和内部误差,基于整体几何模型设计了相应的内外误差补偿方案,对该类相机几何模型的优化进行了研究。以8片TDI CCD交错拼接的天绘一号(TH-1)卫星高分相机原始影像为试验数据设计了多组试验对本文方法进行验证。结果表明:本文的整体几何模型可严格描述该类相机的原始几何物像关系;仅进行外部误差补偿时,影像定位精度显著提升,但各分片CCD影像残留有不同的系统误差;仅进行内部误差补偿时,影像定位精度没有显著提升,但各分片CCD影像定位精度的一致性得到明显改善;对内部、外部误差均补偿后,影像在X、Y、Z方向的定位精度皆优于2m,且各分片CCD影像定位精度具备一致性;将计算出的内部误差补偿参数应用于成像时间间隔22d的其他多景影像时仍达到了同样的定位精度。 相似文献
3.
4.
作为"云控制"摄影测量理论和方法的发展,研究了DEM约束的立体卫星影像区域网平差方法。与DEM仅作为高程控制信息使用,或者是通过DEM表面匹配实现绝对定向的间接定位方法不同,DEM作为平高控制信息被直接引入至基于RFM模型的卫星影像区域网平差之中。本文方法将连接点地面高程与DEM格网内插高程之差作为虚拟观测值构建约束方程,不仅利用了DEM高程信息,并且利用了其地形曲面包含的平面信息,以"云控制"方式在区域网平差过程中有效消除卫星影像RPC参数中包含的整体偏移及区域网内部的扭曲变形,实现了无地面控制点条件下卫星影像平面及高程绝对定位精度的大幅提升。使用覆盖山东全境的330景天绘一号立体卫星影像进行试验,分别以AW3D30、ASTER GDEM和SRTM GL3共3种开源DEM作为控制信息,并使用100个外业实测控制点进行精度评测。试验表明,以DEM作为控制可显著提高区域网平差的平面与高程精度,卫星影像绝对定位精度与DEM自身精度有关。当使用AW3D30作为控制时,可以取得与使用100个外业控制点平差同等精度,平面中误差为5.0 m(约1像素),高程中误差为2.9 m。试验结果证明了DEM替代外业控制点作为平差控制信息的有效性与可行性。 相似文献
5.
《ISPRS Journal of Photogrammetry and Remote Sensing》2000,55(1):59-71
This paper describes the geometric in-flight calibration of the Modular Optoelectronic Multispectral Scanner MOMS-2P, which has collected digital multispectral and threefold along-track stereoscopic imagery of the earth's surface from the PRIRODA module of the Russian space station MIR from October 1996 to August 1999. The goal is the verification and, if necessary, the update of the calibration data, which were estimated from the geometric laboratory calibration. The paper is subdivided into two parts, describing two different procedures of geometric in-flight calibration. The first method is based on DLR matching software and is restricted to nadir looking channels, which are read out simultaneously. From a high number of individual point matches between the images of the same area taken by the different CCD arrays, the most reliable ones are selected and used to calculate shifts with components in and across flight direction between the CCD arrays. These actual shifts are compared to the nominal shifts, derived from the results of the laboratory calibration, and parameters of the valid camera model are estimated from both data sets by least squares adjustment. A special case of band-to-band registration are the two optically combined CCD-arrays of the nadir high-resolution channel. They are read out simultaneously with a nominal 10 pixel overlap in stereoscopic imaging mode A. The DLR matching software is applied to calculate the displacement vector between the two CCD-arrays. The second method is based on combined photogrammetric bundle adjustment using an adapted functional model for the reconstruction of the interior orientation. It requires precise and reliable ground control information as well as navigation data of the navigation-package MOMS-NAV. Nine contiguous image scenes of MOMS-2P data-take T083C building an about 550-km-long strip over southern Germany and Austria taken in March 1997 were evaluated. From both procedures calibration data are estimated, which are presented and compared to the lab-calibration results. 相似文献
6.
This paper presents a method to integrate linear horizontal, vertical and right-angled scene structures into the bundle adjustment of image sequences. An increasing number of airborne image acquisition systems is available and equipped with non-metric small- or medium-frame cameras and no or insufficiently accurate INS devices. In cases where the data is to be used for the production of geo-spatial data, where a certain accuracy and precision is required, an indirect sensor orientation, possibly including self-calibration, needs to be performed. The idea which led to the presented approach is to reduce the number of GCPs necessary for this task by applying the mentioned scene structures. The method directly uses the linear structures, visible at man-made objects as fictive observations within the adjustment, while self-calibration of intrinsic camera parameters and lens distortion is included as well.Experiments with two datasets demonstrate that, through this method, only limited GCP information is required to obtain satisfactory results. In fact, in one experiment using oblique images, several scene constraints were provided and only the datum was defined by ground control. The residuals at check points from this setup were similar to the traditional case where several well-distributed GCPs were available in the scene. In the second experiment the ability of this approach to support the bundle adjustment was shown for a UAV dataset. Although no GCP and camera calibration information was available, the visual inspection of adjusted object points and the residuals at horizontal structures confirmed the ability of the method to align an image block with the structure, as embodied in the defined scene constraints. Despite the convincing outcome of the experiments, it needs to be mentioned that some manual work is still involved in defining the constraints. In future work the issue of automation will be addressed. 相似文献
7.
以三角网和贴面纹理影像为精细地面模型的数据构成,以亚m级TDI CCD(time delay and iintegration charge coupled devices)立体测绘相机为仿真对象进行成像仿真。通过建立每个像元的"视线目标索引"判断目标对相机和太阳的可见视性,进而生成阴影。将TDI CCD焦平面细分成很多子CCD,同时将积分时间细分,计算"连续焦面辐照度影像"并实现静态MTF仿真,然后得到"时间平均静态影像"。实现了多级积分条件下的霰粒噪声仿真和TDI CCD多级动态积分成像的仿真。推导了相机安装角和光学节点从平台坐标系到物方坐标系的转换公式,结合姿态参数和CCD畸变参数,实现了任意侧摆角度和相机安装角度的成像仿真。 相似文献
8.
P.V. Radhadevi S.S. Solanki R. Ramchandran R. Krishnan 《International Journal of Applied Earth Observation and Geoinformation》2008,10(2):133-1
Wide image swath with a high geometric resolution is required for photogrammetric applications. Both demands can be satisfied using staggered line arrays. Different bands of IRS-P6 LISS-4 sensor use staggered arrays for imaging. This paper describes a method for computing the offset for geometric alignment of odd and even lines of the staggered array of IRS-P6 LISS-4 imagery. The odd and even pixel rows are separated by 35 μm (equal to 5 pixels) in the focal plane in the along-track direction. Slightly different viewing angles of both lines of a staggered array can result in a variable sampling pattern on the ground because of the attitude fluctuations, satellite movement, terrain topography, PSM steering and small variations in the angular placement of the CCD lines (from the pre-launch values) in the focal plane. Non-accounting of this variable sampling value during the video data alignment will introduce deterioration of image quality and geometric discontinuity of features. The stagger parameters can be computed by the reconstruction of the viewing geometry with a calibrated camera geometry model and a public domain DEM. The impact of the line separation in the focal plane during imaging for different viewing configurations and terrain heights are studied and reported in this paper. Computed values from the model are in good agreement with what is observed in the raw image for different view angles. The results verify the model and are representative of the stability of the platform. 相似文献
9.
S. Manthira Moorthi Raja Kayal R. Rama Krishnan P.K. Srivastava 《International Journal of Applied Earth Observation and Geoinformation》2008,10(2):140-1
RESOURCESAT-1 satellite was launched in October of 2003. Since then it has been consistently providing high quality 5 m monochromatic and multispectral images of same resolution. LISS-4 MX sensor has complex acquisition geometry. It operates in three spectral bands imaged by 3 CCD arrays, which are separated by a finite time in imaging along the satellite track direction. Individual band data is acquired at different times while the satellite is driven by a pre-determined yaw profile. In addition, the odd–even pixels are too shifted by a small fixed delay in time. A unique challenge in LISS-4 MX Level-2 data processing sub-system is to autonomously rectify and additionally co-register the three bands data because of the influence of orbit and attitude in the time gap in the imaging sequence. In this paper, authors bring out details of in-flight calibration arrived for LISS-4 MX sensor. It addresses parameterization of co-registration problem by doing sensitivity analysis of the geometric model parameters to achieve co-registration among all bands. This approach can also be used for other sensor system having similar imaging geometry to achieve improved image co-registration among bands. 相似文献
10.
LMCCD相机作为天绘一号卫星的有效载荷,是保证其实现无地面控制点摄影测量精度的关键。本文分别利用LMCCD影像和三线阵CCD影像对天绘一号卫星的相机参数进行了在轨标定计算,并利用各组在轨标定结果对定位精度（重点对高程误差）进行了统计分析。试验结果表明：与单纯的三线阵CCD影像的相比,LMCCD影像在相机参数在轨标定中能有效抵御因卫星姿态变化率导致的光束法平差航线系统变形问题,在天绘一号现有姿态变化率水平条件下,利用LMCCD影像进行相机参数在轨标定可保证天绘一号01星实现无地面控制点摄影测量精度要求。 相似文献
11.
12.
卫星三线阵CCD影像光束法平差研究 总被引：9，自引：0，他引：9
王任享 《武汉大学学报(信息科学版)》2003,28(4):379-385
简单回顾了“定向片法”和“EFP法”计算外方位元素的原理 ,指出仅仅利用三线阵CCD影像及地面控制点的空中三角测量 ,不能实现单航线角隅各一个控制点的平差计算模型与实地的相似性 (不计像点观测误差 )。利用EFP法空中三角测量的原理 ,进一步分析了其原因 ,提出了在相邻EFP像片之间增设连接点 ,同时要求在航线首末基线范围内的连接点带地面坐标或连接点在其左、右EFP像片上的坐标之一是其真中心投影坐标。在其控制下 ,平差结果实现了包括基线数B =2在内的单航线平差计算的模型基本与实地相似 ,并列出了在多种情况下利用计算机模拟数据进行平差精度统计的结果。最后就解决连接点真中心投影坐标获取问题 ,对三线阵CCD相机提出了附加要求 ,即在正视CCD线阵右侧附加两个 1 5 0 0像元× 1 5 0 0像元 (或更小 )的CCD面阵的构想方案 相似文献
13.
基于单位四元数的机载三线阵影像光束法平差 总被引：1，自引：0，他引：1
为克服欧拉角在空间方位的描述和插值中的局限性,采用单位四元数来描述相机的姿态,推导了四元数描述的共线条件方程。在此基础上,提出了将四元数球面线性插值(Slerp)引入到三线阵影像定向片法平差的思想,通过利用Slerp公式进行相机姿态的匀速插值,建立了基于单位四元数的三线阵影像平差的数学模型并进行了线性化。两套ADS40数据的试验结果表明,在区域四角布设平高控制点的情况下,基于Slerp模型的定向片光束法平差在平面和高程方向均可取得优于1个地面像元(GSD)的定位精度,是三线阵相机检校和空中三角测量较理想的技术手段。 相似文献
14.
缺少控制点的卫星遥感对地目标定位 总被引：15，自引：2，他引：15
从单线阵推扫式传感器的成像机理出发，利用6个卫星轨道开普勒参数和3个传感器姿态角建立了推扫式卫星遥感影像坐标与其地面点在地心坐标系下的坐标关系式，即构像方程。按照所建立的构像方程，对某地区一景SPOT-5影像进行对地目标定位，获得了实地上83．392m的平面精度；利用单个地面控制点对卫星轨道开普勒参数和传感器姿态实施调整后，目标定位精度提高到14．217m。试验证实，所建立的构像方程是正确的,在卫星遥感对地目标定位中有较好的应用前景。 相似文献
15.
16.
Bias-corrected rational polynomial coefficients for high accuracy geo-positioning of QuickBird stereo imagery 总被引：1，自引：0，他引：1
Xiaohua Tong Shijie Liu Qihao Weng 《ISPRS Journal of Photogrammetry and Remote Sensing》2010,65(2):218-226
The rational function model (RFM) is widely used as an alternative to physical sensor models for 3D ground point determination with high-resolution satellite imagery (HRSI). However, owing to the sensor orientation bias inherent in the vendor-provided rational polynomial coefficients (RPCs), the geo-positioning accuracy obtained from these RPCs is limited. In this paper, the performances of two schemes for orientation bias correction (i.e., RPCs modification and RPCs regeneration) is presented based on one separate-orbit QuickBird stereo image pair in Shanghai, and four cases for bias correction, including shift bias correction, shift and drift bias correction, affine model bias correction and second-order polynomial bias correction, are examined. A 2-step least squares adjustment method is adopted for correction parameter estimation with a comparison with the RPC bundle adjustment method. The experiment results demonstrate that in general the accuracy of the 2-step least squares adjustment method is almost identical to that of the RPC bundle adjustment method. With the shift bias correction method and minimal 1 ground control point (GCP), the modified RPCs improve the accuracy from the original 23 m to 3 m in planimetry and 17 m to 4 m in height. With the shift and drift bias correction method, the regenerated RPCs achieve a further improved positioning accuracy of 0.6 m in planimetry and 1 m in height with minimal 2 well-distributed GCPs. The affine model bias correction yields a geo-positioning accuracy of better than 0.5 m in planimetry and 1 m in height with 3 well-positioned GCPs. Further tests with the second-order polynomial bias correction model indicate the existence of potential high-order error signals in the vendor-provided RPCs, and on condition that an adequate redundancy in GCP number is available, an accuracy of 0.4 m in planimetry and 0.8 m in height is attainable. 相似文献
17.
利用ERDAS IMAGINE进行影像的几何精校正 总被引：14，自引：0，他引：14
几何精校正是利用地面控制点(GCP)对遥感影像进行的几何校正。用ERDAS IMAGINE软件进行几何精校正，关键在于相关模型参数设置、控制点输入和几何精校正。影响几何精校正的因素，主要表现在GCP的数量、分布和定位精度。此外校正方法不同，影像的纠正精度也不同。 相似文献
18.
T. Westin 《The Photogrammetric Record》1991,13(78):923-929
A mathematical model for pass processing of SPOT imagery is formulated. It is based on the fact that during one pass, the image data stream from each of the instruments in SPOT forms one single very long image. The geometry of this extended image can thus be rectified with as few control points as for only one scene if orbital constraints and attitude measurements are properly taken into consideration. SPOT imagery is, however, not available as this single long image, but only sectioned into scenes. This creates problems which are accounted for in the solution. The possibility of gaps in the sequence of scenes is also taken into consideration. Extrapolation over gaps is of special interest and, by investigating attitude variability, it is shown that extrapolation is successful over multiple scene gaps which is also verified in a real data test. 相似文献
19.
CE-1立体相机与激光高度计数据联合平差 总被引：1，自引：0，他引：1
CE-1三线阵立体相机和激光高度计主要用于获取月球形貌信息.CE-1沿轨运动过程中,可同时获取高分辨率的三线阵扫描影像和高精度的激光测高数据.在分析立体影像与激光高度计数据不一致性的基础上,为提高定位精度,将激光测距数据引入三线阵立体影像光束法平差处理.本文提出一种改进的外定向参数模型,采用3阶Lagrange多项式模型(LPM)建立外定向线元素内插模型,采用四元数球面线性内插建立外定向角元素模型,并根据改进模型建立激光高度计数据与影像数据的联合平差数学模型.试验表明,本文立体相机和激光高度计数据联合平差模型是有效的. 相似文献