共查询到18条相似文献，搜索用时 100 毫秒
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稀少控制条件下的SPOT 5 HRS影像定向试验 总被引：1，自引：0，他引：1
通过生产试验,探讨了不同控制点数量及分布下的SPOT 5 HRS影像的定向精度问题,分析了稀少控制点定向后SPOT 5 HRS影像的误差分布情况,为SPOT 5 HRS影像在外业控制点获取困难地区的应用提供了可行方法。 相似文献
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介绍了SPOT 5卫星HRG、HRS影像,讨论了SPOT 5影像空中三角测量的方法,以及利用SPOT 5影像进行DEM、DOM、DLG等地理信息产品生产的流程,对比了有、无地面控制纠正SPOT 5影像的精度情况,最后分析了SPOT 5影像在空间数据快速更新中的作用。 相似文献
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SPOT5 HRG严格物理模型转换成RPC模型的方法 总被引：1，自引：1，他引：0
SPOT5 HRG使用的越来越多,使用SPOT5 HRG进行测图,就必然需要推导SPOT5 HRG严格物理模型,通过推导SPOT5 HRG严格物理模型,我们发现该模型计算量很大,为了解决这个问题,我们使用虚拟点阵将RPC模型和严格物理模型联系起来,这样就能将SPOT5 HRG物理模型转换为RPC模型,最后用实际生产数据检验了该RPC模型的正确性 相似文献
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凭借不断提高的时间、空间、光谱分辨率以及影像质量,卫星遥感影像成为测绘生产中使用的重要数据源。本文采用不同控制点布设方案进行Pleiades立体影像单侧定向试验,研究了Pleiades影像的定向精度情况,可为地面控制获取困难区域的定向提供参考。 相似文献
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本文结合生产实践讨论了利用SPOT5 HRS/HRG立体影像提取DEM的技术和方法,通过试验证明了SPOT5 HRS/HRG立体影像在提取高山峡谷地区DEM的优势,并对提取出的DEM成果精度进行了分析。 相似文献
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随着遥感技术的飞速发展,高分辨率卫星遥感影像越来越多地用于地理信息产品生产。本文首先介绍了SPOT系列的下一代光学遥感卫星Pleiades,通过生产试验,研究了Pleiades卫星影像稀少控制点定向情况,分析了Pleiades卫星影像立体测图的精度,并给出相关结论供Pleiades卫星影像生产实践参考。 相似文献
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考虑卫星影像重复观测性, 利用已精确定向影像增加多余观测, 通过与新获取影像联合平差实现了无控制点影像直接定位。针对线阵光学影像逐行推扫成像的特点, 内插新获取影像姿态轨道值, 推导与已定向影像直接联合定位的数学模型, 并给出了各类观测值权的确定方法。最后通过试验验证了无控制点情况下进行已精确定向影像与新影像联合平差是可行的;结果表明要达到无控制点高精度定位目的,应尽量选择与新影像间重叠度高、分辨率高的已定向影像。为对地观测数据的实时化处理提供了思路。 相似文献
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推扫式光学卫星影像系统几何校正产品的3维几何模型及定向算法研究 总被引：1，自引：0，他引：1
提出推扫式光学卫星影像系统几何校正产品的3维几何模型的概念,在推导推扫式光学卫星影像系统几何校正产品的3维几何模型基础上,对RPC模型用于表示推扫式光学卫星影像系统几何校正产品的3维几何模型的可行性进行分析,并用SPOT5HRG影像以进行验证。实验表明,RPC模型能够很好地用于表示推扫式光学卫星影像系统几何校正产品的高程起伏引起的变形规律,基于该模型的影像定向精度不低于推扫式光学卫星影像辐射校正产品的严密成像几何模型。 相似文献
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Large area tree maps, important for environmental monitoring and natural resource management, are often based on medium resolution satellite imagery. These data have difficulty in detecting trees in fragmented woodlands, and have significant omission errors in modified agricultural areas. High resolution imagery can better detect these trees, however, as most high resolution imagery is not normalised it is difficult to automate a tree classification method over large areas. The method developed here used an existing medium resolution map derived from either Landsat or SPOT5 satellite imagery to guide the classification of the high resolution imagery. It selected a spatially-variable threshold on the green band, calculated based on the spatially-variable percentage of trees in the existing map of tree cover. The green band proved more consistent at classifying trees across different images than several common band combinations. The method was tested on 0.5 m resolution imagery from airborne digital sensor (ADS) imagery across New South Wales (NSW), Australia using both Landsat and SPOT5 derived tree maps to guide the threshold selection. Accuracy was assessed across 6 large image mosaics revealing a more accurate result when the more accurate tree map from SPOT5 imagery was used. The resulting maps achieved an overall accuracy with 95% confidence intervals of 93% (90–95%), while the overall accuracy of the previous SPOT5 tree map was 87% (86–89%). The method reduced omission errors by mapping more scattered trees, although it did increase commission errors caused by dark pixels from water, building shadows, topographic shadows, and some soils and crops. The method allows trees to be automatically mapped at 5 m resolution from high resolution imagery, provided a medium resolution tree map already exists. 相似文献
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SHIWenzhong AhmedShaker 《地球空间信息科学学报》2004,7(1):24-30
The exploitation of different non-rigorous mathematical models as opposed to the satellite rigorous models is discussed for geometric corrections and topographic/thematic maps production of high-resolution satellite imagery (HRSI). Furthermore, this paper focuses on the effects of the number of GCPs and the terrain elevation difference within the area covered by the images on the obtained ground points accuracy. From the research, it is obviously found that non-rigorous orientation and triangulation models can be used successfully in most cases for 2D rectification and 3D ground points determination without a camera model or the satellite ephemeris data. In addition, the accuracy up to the sub-pixel level in plane and about one pixel in elevation can be achieved with a modest number of GCPs. 相似文献
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Saeid Sadeghian Mohammad Javad Valadan Zoej Mahmoud Reza Delavar Ahmad Abootalebi 《International Journal of Applied Earth Observation and Geoinformation》2001,3(4):366
The huge capability of high resolution satellite imageries (HRSI), that includes spatial, spectral, temporal and radiometric resolutions as well as stereoscopic vision introduces them as a powerful new source for the Photogrammetry, Remote Sensing and GIS communities. High resolution data increases the need for higher accuracy of data modeling. The satellite orbit, position, attitude angles and interior orientation parameters have to be adjusted in the geometrical model to achieve optimal accuracy with the use of a minimum number of Ground Control Points (GCPs). But most high resolution satellite vendors do not intend to publish their sensor models and ephemeris data. There is consequently a need for a range of alternative, practical approaches for extracting accurate 2D and 3D terrain information from HRSI. The flexibility and good accuracy of the alternative models demonstrated with KFA-1000 and the well-known SPOT level 1A images. A block of eight KFA-1000 space photos in two strips with 60% longitudinal overlap and 15% lateral sidelap and SPOT image with rational function, DLT, 2D projective, polynomials, affine, conformal, multiquadric and finite element methods were used in the test. The test areas cover parts of South and West of Iran. Considering the quality of GCPs, the best result was found with the DLT method with a RMSE of 8.44 m for the KFA-1000 space photos. 相似文献
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天绘一号03星无控定位精度改进策略 总被引：1，自引：1，他引：0
“全球连续覆盖模式”传输型摄影测量卫星系动态摄影，无控定位模式下难以达到框幅式像片定位水平。本文在天绘一号已有研究基础上，深化03星摄影测量无控定位精度改进模式的探讨研究。在相机参数在轨标定中增加对相机内方位元素的附加改正，解决相机结构宽高比（卫星条带摄影覆盖宽度与卫星轨道高度的比值）太小对主距标定结果的影响，进而削弱系统误差，提高卫星影像的平面定位精度。通过境外地区检测，无控定位精度达到高程2.4 m（RMS），平面3.7 m（RMS）。检测结果表明，只依靠星上GNSS接收机、星敏感器，利用相机参数在境内标定结果，“全球连续覆盖模式”单航线卫星影像无控定位结果达到理论设计指标。 相似文献
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This study assesses the usefulness of Nigeriasat-1 satellite data for urban land cover analysis by comparing it with Landsat and SPOT data. The data-sets for Abuja were classified with pixel- and object-based methods. While the pixel-based method was classified with the spectral properties of the images, the object-based approach included an extra layer of land use cadastre data. The classification accuracy results for OBIA show that Landsat 7 ETM, Nigeriasat-1 SLIM and SPOT 5 HRG had overall accuracies of 92, 89 and 96%, respectively, while the classification accuracy for pixel-based classification were 88% for Landsat 7 ETM, 63% for Nigeriasat-1 SLIM and 89% for SPOT 5 HRG. The results indicate that given the right classification tools, the analysis of Nigeriasat-1 data can be compared with Landsat and SPOT data which are widely used for urban land use and land cover analysis. 相似文献
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Abstract Riparian vegetation has a fundamental influence on the biological, chemical and physical nature of rivers. The quantification of riparian landcover is now recognised as being essential to the holistic study of the ecosystem characteristics of rivers. Medium resolution satellite imagery is now commonly used as an efficient and cost effective method for mapping vegetation cover; however such data often lack the resolution to provide accurate information about vegetation cover within riparian corridors. To assess this, we measure the accuracy of SPOT multispectral satellite imagery for classification of riparian vegetation along the Taieri River in New Zealand. In this paper, we discuss different sampling strategies for the classification of riparian zones. We conclude that SPOT multispectral imagery requires considerable interpretative analysis before being adequate to produce sufficiently detailed maps of riparian vegetation required for use in stream ecological research. 相似文献