共查询到19条相似文献，搜索用时 235 毫秒
1.
研究利用高光谱成像数据,用数字的方法定量模拟了ＳＯＰＴ－ＨＲＶ,ＣＢＥＲＳ－ＣＣＤ,Ｌａｎｄｓａｔ５－ＴＭ和ＮＯＡＡ１４－ＡＶＨＲＲ类似波段的空中表面反射率及地面光谱反射度图像,并利用这些对上述传感器相应波段的光谱响应,大气影响特性用基于反射率和基于归一化植被指数的方法进行了定量比较分析。 相似文献
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研究利用高光谱成像数据,用数字的方法定量模拟了SPOT－HRV、CBERS-CCD、Landsat5-TM和NOAA14-AVHRR类似波段的空中表面反射率及地面光谱反射率图像,并利用这些图像对上述传感器相应波段的光谱响应、大气影响特性用基于反射率和基于归一化植被指数（NDVI）的方法进行了定量的比较分析。研究表明,由于传感器类似波段的光谱响应不同,因而由其计算的反射率和NDVI之间均存在明显差异,这种差异是大气改正所无法完全消除的。多传感器定量分析时需要进行相应的辐射改正。 相似文献
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根据高光谱分辨率的航空成像光谱（ＭＡＩＳ）和热红外多光谱（ＴＩＭＳ）图像数据中遥感信息特点，即可从其数据获得成像地物光谱，利用航空成像光谱图像处理和分析方法，可有效和精确地对地物特性进行识别和提取。此次以调查沉积岩地区地质地层单元、岩性识别为研究内容的中日联合遥感研究所采用的图像数据，是由中国科学院上海技术物理研究所新开发的ＭＡＩＳ和ＴＩＭＳ获取的。研究结果表明，利用计算机图像处理方法，对ＴＩＭＳ图像进行主成分分析（ＰＣ），ＭＡＩＳ的短波红外（ＳＷＩＲ）图像的假彩色合成图（ＦＣＣ），以及可见近红外（ＶＮＩＲ）图像波段差值处理，可将研究区内出露的白云岩、灰岩以及红色砂岩、绿色砂岩等岩性识别出来，同时圈出了研究区内出露的各个时代的地层，证明了ＭＡＩＳ和ＴＩＭＳ在地质制图方面有较大的潜力。 相似文献
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图像获取条件对ＳＰＯＴ景像的构成有极大影响，也直接影响对ＳＰＯＴ图像的处理方法。ＳＰＯＴ图像的辅助数据在解析或数字处理中有重要应用。本文对ＳＰＯＴ卫星与视点间的地心角、节距角ω卫星与视点的纬度差异、景像方位角Ｔ、景像尺寸和ＳＰＯＴ图像格网参考系统ＧＲＳ中（Ｋ，Ｊ）与（λ， Ｂ）换算公式进行了推证和分析，并以ＳＰＯＴ辅助数据验证了（Ｋ，Ｊ）与（λ，Ｂ）换算的精度。 相似文献
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全站仪与计算机数据通讯 总被引：4，自引：0，他引：4
本文介绍徕卡（ＬＥＩＣＡ）、日本尼康（ＮＩＫＯＮ）、索佳（ＳＯＫＫＩＡ）、拓普康（ＴＯＰＣＯＮ）、宾得（ＰＥＮＴＡＸ）、瑞典捷创力（ＧＥＯＤＩＭＥＴＥＲ）全站仪与ＰＣ—Ｅ５００袖珍计算机、惠普ＨＰ１００／ＨＰ２００掌上机、ＩＢＭ台式计算机联机使用，介绍了全站仪的数据格式、通讯程序和使用方法。 相似文献
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遥感多光谱影像数据与航片数字化影像融合方法的研究 总被引：8，自引：0，他引：8
本文探讨利用ＨＩＳ变换对航片化影像分析与遥感多光谱影像ＳＰＯＴ ＸＳ、Ｌａｎｄｓａｔ ＴＭ和ＭＳＳ进行融合的方法，并提出了一种改进的方法。试验结果表明：本文提出的方法行之有效。融合后的影像在很大程度上保留了原多光谱影像的光谱特征，空间分解力较我光谱影像提高到近３倍，清晰度也提高了。因而具有更强的解译和量测能力，能进一步提高分类精度、制作专题图的精度，多时相监测能力等。 相似文献
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本文论述了利用ＭＡＰＧＩＳ对１：２千带状地形图数字采集过程中应采用的方法,并通过分析ＭＡＰＧＩＳ的数据输出方式,提出由ＭＡＰＧＩＳ向ＡＵＴＯＣＡＤ数据输出时存在的问题及解决的办法。 相似文献
8.
南中国海TOPEX/POSEIDON轨迹交叉点测高数据的潮汐调和分析 总被引：25，自引：2，他引：23
讨论了由卫星测高数据进行潮汐分析的混叠问题和分潮的可分辨性;用ＴＯＰＥＸ／ＰＯ－ＳＥＩＤＯＮ海面重复轨迹交叉点测高数据计算南中国海１２个分潮（Ｓａ,Ｓｓａ,Ｍｍ,Ｍｆ,Ｑ１,Ｏ１,Ｐ１,Ｋ１,Ｎ２,Ｍ２,Ｓ２,Ｋ２）的调和常数;用不同方法验证了计算结果的精度,分析表明,分潮的振幅精度和潮高精度已达到±２ｃｍ,四个较大分潮（Ｏ１,Ｐ１,Ｋ１,Ｍ２）的迟角误差不超过±７°。其中Ｏ１,Ｋ１,和Ｍ２与验潮站实测值的最大偏差小于７°;给出了最大的全日和半日分潮（Ｋ１,Ｍ２）的潮波图。 相似文献
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《国土资源遥感》2002,(4)
卫星成像仪分辨率 ｍ光谱范围 μｍ 侧摆 (°)视场宽度 ｋｍＳＰＯＴ 52 0 0 2 0 5 0 4-----ＨＲＧＨｉｇｈＲｅｓｏｌｕｔｉｏｎＧｅｏｍｅｔｒｉｃ多光谱 :10 (Ｂ1,Ｂ2 ,Ｂ3 )短波红外 :2 0全色 :5全色Ｓｕｐｅｒｍｏｄｅ :2 .5 多光谱 (ＸＩ)Ｂ1:绿 (0 .5 0～ 0 .5 9)Ｂ2 :红 (0 .61～ 0 .68)Ｂ3 :近红外 (0 .79～ 0 .89)ＳＷＩＲ :短波红外 (1.5 8～ 1.75 ) 全色 (Ｍ)Ｍ :(0 .49～ 0 .69)是最大侧视角+ -2 760ＨＲＳ 5× 10高程精度 15 全色Ｍ :(0 .49～ 0 .69)不 12 0× 60 0ＶＥＧＥＴＡＴＩＯＮ星下点 :1.15ｋｍ 0 .43～… 相似文献
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An empirical study was performed assessing the accuracy of land use change detection when using satellite image data acquired ten years apart by sensors with differing spatial resolutions. Landsat/Multi‐spectral Scanner (MSS) with Landsat/Thematic Mapper (TM) or SPOT/High Resolution Visible (HRV) multi‐spectral (XS) data were used as a multi‐data pair for detecting land use change. The primary objectives of the study were to: (1) compare standard change detection methods (e.g. multi‐date ratioing and principal components analysis) applied to image data of varying spatial resolution; (2) assess whether to transform the raster grid of the higher resolution image data to that of the lower resolution raster grid or vice‐versa in the registration process: and (3) determine if Landsat/TM or SPOT/ HRV(XS) data provides more accurate detection of land use changes when registered to historical Landsat/MSS data. Ratioing multi‐sensor, multi‐date satellite image data produced higher change detection accuracies than did principal components analysis and is useful as a land use change enhancement technique. Ratioing red and near infrared bands of a Landsat/MSS‐SPOT/HRV(XS) multi‐date pair produced substantially higher change detection accuracies (～10%) than ratioing similar bands of a Landsat/MSS ‐ Landsat/TM multi‐data pair. Using a higher‐resolution raster grid of 20 meters when registering Landsat/MSS and SPOTZHRV(XS) images produced a slightly higher change detection accuracy than when both images were registered to an 80 meter raster grid. Applying a “majority”; moving window filter whose size approximated a minimum mapping unit of 1 hectare increased change detection accuracies by 1–3% and reduced commission errors by 10–25%. 相似文献
12.
E. Vaudour 《国际地球制图》2013,28(3):197-216
The aim of this work was to map Red Mediterranean soils, for which no previous mapping approach exists, using optical multispectral satellite remote sensing data. This case study explores the use of SPOT XS images over the viticultural Southern Rhone Valley, France, to map exposed vineyard soils. Field spectral measurements were used to distinguish Red Mediterranean soil surfaces during Spring 1999. A supervised maximum likelihood classification was applied to sparsely vegetated and unvegetated surfaces of two spring images from 1995 and 1997, drawing on the field training set and available soil data. Similar global spatial segmentation was obtained despite different soil surface states on these dates. Classification performances were higher than 84% in both images. Mean classification accuracies of Red Mediterranean soils at seven reference surfaces were 60% in 1995 and 70% in 1997. This suggests that the direct use of optical remote sensing data at medium resolution can be useful for mapping bare Red Mediterranean soils. 相似文献
13.
Abstract In this paper we process diachronic SPOT satellite images acquired with different viewing angles in order to assess the aerosol optical thickness (AOT) spatial distribution over Brescia. This urban area, located in Northern Italy, is subject to frequent visibility‐reducing smog episodes. AOT was calculated by using the Differential Textural Analysis (DTA) code on a satellite data series consisting by one pollution‐free and various pollution‐loaded SPOT images. The resulting maps showed the horizontal distribution of AOT with a resolution of 500 metres. These maps can be readily integrated with the results obtained by mesoscale modelling, ground measurements, and respond to local scale application requirements. Satellite AOT retrieval compared successfully with available AOT ground‐based measurements and with pollution measurements in the ambient air. In this study the use of diachronic multiangle SPOT imagery allowed us to analyse the effect of the viewing angle variation on AOT retrieval accuracy based on the contrast reduction method. 相似文献
14.
This study presents an approach for the automatic extraction of dynamic sub-boundaries within existing agricultural fields from remote sensing imagery using perceptual grouping. We define sub-boundaries as boundaries, where a change in crop type takes a place within the fixed geometry of an agricultural field. To perform field-based processing and analysis operations, the field boundary data and satellite imagery are integrated. The edge pixels are detected using the Canny edge detector. The edge pixels are then analyzed to find the connected edge chains and from these chains the line segments are detected using the graph-based vectorization method. The spurious line segments are eliminated through a line simplification process. The perceptual grouping of the line segments is employed for detecting sub-boundaries and constructing sub-fields within the fixed geometry of agricultural fields. Our strategy for perceptual grouping involves the Gestalt laws of proximity, continuation, symmetry and closure. The processing and analysis operations are carried out on field-by-field basis. For each field, the geometries of sub-boundaries are determined through analyzing the line segments that fall within the field and the extracted sub-boundaries are integrated with the fixed geometry of the field.The experimental validation of the approach was carried out on the SPOT4 multispectral (XS) and SPOT5 XS images that cover an agricultural area located in the north-west section of Turkey. The overall matching percentages between the reference data and the automatically extracted sub-boundaries were computed to be 82.6% and 76.2% for the SPOT5 and SPOT4 images respectively. The higher matching percentage of the SPOT5 image is due to the fact that some of the boundaries present in the SPOT5 image were not detected in the coarser resolution SPOT4 image. For the SPOT5 image, of the total 292 fields processed, 177 showed a total agreement between the detected segments and the reference data. For the SPOT4 image, 154 fields showed a total agreement between the detected segments and the reference data. 相似文献
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Abstract Landsat MSS, TM and SPOT XS imageries were used in conjunction with unsupervised, supervised and hybrid classilication techniques to classify land cover types in semi‐arid savannas of Mathison Pastoral Station in the Katherine region of northern Australia. Accuracy assessment was based on field data from 246 ground survey sites over a 745‐km2 study area. Of 14 land cover classes identified by traditional mapping means, all combinations of imageries and classification techniques differentiated at least seven land cover types. The overall accuracy for these classifications ranged between 43% and 67%. SPOT XS image delivered the best accuracy followed by TM and MSS; unsupervised classification performed better than supervised and hybrid methods. User's and producer's accuracy of individual land units ranged from 0% to 100%. Riparian woodlands, woodland on limestone slopes, shrubland on clay plains, woodland on limestone plains and shadows were the best‐mapped classes. The land units that were associated with undulating hills were not mapped accurately. However, incorporation of a digital elevation model (DEM) in a GIS improved the overall accuracy. The user's and producer's accuracy of dominant land cover types were also enhanced. The classification results and the efficacy of the techniques at Mathison were similar to those found for a nearby semi‐arid area (Kidman Springs) about 200 km from Mathison. However, the overall accuracy was lower at Mathison than at Kidman Springs. Spectral classification masks were developed from the SPOT XS and TM imageries at Kidman Springs, and were applied to classify SPOT XS and TM imageries at Mathison. Initial results showed that the classification mask could be successfully extrapolated to map dominant land cover types but only with moderate accuracy (50%). 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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A. K. I. Torleàrrd 《The Photogrammetric Record》1986,12(68):175-196
Recent research involving photogrammetry applied to digital image processing at the Royal Institute of Technology, Stockholm is described. Three particular aspects have been investigated. These concern ground control points for satellite imagery; digital matching of simulated SPOT images; and digital matching of images which have different perspectives. Future prospects of research and development in related topics are outlined. 相似文献
18.
Nathalie Pisot Jean-Paul Xavier Vronique Miegebielle Dominique Coquelet Pierre Leymarie 《ISPRS Journal of Photogrammetry and Remote Sensing》1993,48(6)
This paper illustrates the benefits of DTMs created from SPOT images for the exploration of sedimentary basins. We chose an example located in the Ebro sedimentary basin in Spain, characterized by good outcropping conditions and slight deformations. The data used consist of a pair of SPOT panchromatic images and a SPOT XS image. The work consists of making up a 3D database, followed by interpretation of stereo pairs computed from orthoimages and the DTM. This interpretation is made on a stereoscopic desk and results in a digital file containing in the form of vectors all the observed faults and lithology. These vectors are then used to make calculations on the geometry of the objects they represent: we demonstrate that we can accurately measure layer directions and dips, sediment thicknesses and fault throws. Synthesis of perspective views made at the same time provide a good understanding of the structures and help to test their geometric consistency. Thus knowledge about relief given by DTMs helps to interpret remote detection images in 3D space, and particularly to accurately quantify the results of this interpretation. 相似文献
19.
地物光谱反射率野外测量实验方案改进 总被引：2，自引：1，他引：1
针对现有地物光谱反射率野外测量实验方案的不足,提出了地物光谱反射率的各向异性测量、不同环境条件的对比测量、不同时相的对比测量以及地物光谱反射率图像模拟四项实验改进方案。利用ISI921VF-128野外地物光谱辐射计和ArcG IS、ERDAS软件进行了实例测量与验证,揭示了真实地物光谱反射率的特征,模拟生成了"图谱合一"的地物光谱反射率图像,提高了实验教学质量。 相似文献