共查询到20条相似文献，搜索用时 78 毫秒
1.
根据WorldView高分辨率卫星影像的特点,结合数字空中三角测量原理,为了减少外业像控点工作量,进行稀少控制多模型区域网平差方法进行卫星影像的数字空中三角测量生产试验。在数字空三完成后,进行模型拼接检查,使用一定数量的检查点检查立体模型成果精度,最终得出对卫星影像使用稀少控制多模型区域网平差方法可达到的精度指标。最终为WorldView卫星影像的稀少控制数字空三作业提供可靠的理论依据和合理的作业方法。 相似文献
2.
仅用虚拟控制点的超大区域无控制区域网平差 总被引：2，自引：1，他引：1
利用光学卫星影像进行无控制测图是摄影测量追求的目标。针对超大区域无控制测图的需求,本文提出了一种以单景影像为平差单元,基于虚拟控制点的光学卫星影像超大规模无控制区域网平差方法。该方法利用待平差影像的初始RPC模型生成虚拟控制点,并将其作为带权观测值引入平差模型中以改善平差模型的状态,克服了在无控制点条件下平差精度不稳定、误差过度累积引起的网的扭曲变形等问题。为了验证本方法的有效性和精度,利用资源三号卫星获取的覆盖全国的26 406景影像进行区域网平差试验,并利用全国范围内分布的约8000个高精度控制点对平差后自动生产的DOM和DSM产品的几何精度进行验证。试验结果表明,平面和高程中误差均达到了4m以内,同时,区域网内部相邻影像之间的几何拼接精度优于1个像素,满足无缝拼接的要求。 相似文献
3.
CBERS-02B卫星遥感影像的区域网平差 总被引：2，自引：1，他引：1
针对中巴资源一号卫星(CBERS-02B)卫星遥感影像姿态角误差较大的特点,提出了利用区域网平差方法提高其对地目标定位精度的策略和具体计算过程。首先对参与平差的每景影像选取4个地面控制点进行影像姿态角常差检校,然后采用与地形无关方案解求各自的RPC参数,最后选取带仿射变换项的有理函数模型(RFM)进行多重覆盖影像的区域网平差。对两个地区的0级CBERS-02B单条CCD立体影像对的区域网平差试验表明,对地目标定位的平面和高程精度均达到了±3个像元的水平,且高程精度明显优于平面精度。相对于常规的卫星遥感影像区域网平差方法,平面和高程精度均有明显提升,几乎达到国外同等高分辨率卫星遥感影像的几何定位精度。这说明中国卫星遥感影像亦具有较好的几何定位潜力,在区域网平差之前进行系统误差预改正是必要和可行的。 相似文献
4.
SFM的倾斜航空影像空中三角测量 总被引：1，自引：0，他引：1
针对传统空中三角(简称空三)测量方法处理倾斜航空影像的不足,提出了一种基于SFM算法的倾斜航空影像空三测量方法。首先利用垂直影像空三结果获取初始区域网模型,垂直影像空三解算可通过常规的空三算法或现有的软件获取。然后采用SFM算法,在初始区域网模型的基础上,递增式地恢复倾斜影像的外方位元素,最后将垂直影像和倾斜影像联合进行绝对定向、区域网光束法平差。选用玉树数据进行空三试验,结果表明:本文提出的SFM方法能够精确解算出倾斜航空影像的外方位元素,且空三结果优于现有倾斜影像空三软件Pix4Dmapper,可以作为一种倾斜航空影像定向方法。 相似文献
5.
考虑多普勒参数的SAR影像距离——共面方程及其定位 总被引：1，自引：0，他引：1
通过对合成孔径雷达（SAR）影像成像几何机理的分析,以传感器位置和姿态作为定向参数,构建了考虑多普勒参数的SAR影像距离—共面方程及基于该方程的SAR影像空中三角测量模型。以登封地区99景0.5 m分辨率机载非0多普勒SAR影像为试验数据,进行了单片定向、无控制点的自由网平差、稀少控制点的区域网平差及带有自检校参数的区域网平差等系列试验。与R-D模型相比,本文模型减少了定向参数的数目,实现了SAR影像与POS数据的联合平差处理,建立的带有自检校参数的SAR影像区域网平差模型,对提高稀少或无地面控制点条件下未进行（或低精度）几何定标SAR影像的区域网平差精度起到了显著作用。较少控制点条件下模型满足了丘陵和山区1∶5000/1∶10000航摄测图对空中三角测量精度的要求。 相似文献
6.
针对国产卫星境外定位的实际需要,提出利用Google Earth数据量测控制点辅助高分辨率遥感影像区域网平差的方法。首先统一坐标系,将所量测的控制点高程坐标转换为大地高;然后将其视为精度较低的控制点参与平差。试验分为无地面控制点和布设稀少地面控制点两种情况,对于每种情况分别设计不同的试验方案分析Google Earth数据对于定位精度的影响。结果表明利用Google Earth数据辅助区域网平差可以明显提高定位精度,可为缺少地面控制点的境外地区的光学线阵遥感影像几何定位提供新的思路。 相似文献
7.
基于数字正射影像的影像匹配更新及精度探讨 总被引：1，自引：0，他引：1
探讨了以已有数字正射影像成果为像片控制基础,与新的航空影像/卫星影像自动配准、匹配、区域网平差,获取像片控制点及纠正点成果,结合已有数字高程模型进行影像纠正,快速生成新的数字正射影像的技术方法,并对无野外控制条件下不同分辨率的影像所能达到的精度进行了验证分析。 相似文献
8.
本文将有理函数模型(RFM)引入多源SAR遥感影像区域网平差中,并采用多种地面控制点布设方案,对基于严格几何处理模型和带像方仿射变换补偿的RFM区域网平差精度进行了对比分析.试验表明,对于多源SAR影像,在地面控制点较多且分布良好的情况下,基于严格几何处理模型的区域网平差可以获得较好的目标定位结果;基于RFM的区域网平差可以获得与基于严格几何处理模型的区域网平差几乎相当的目标定位精度,且受地面控制点分布和数量影响较小,非常适合稀疏地面控制点情况下的SAR遥感影像几何定位. 相似文献
9.
以西宁市某城镇区域为例,首先利用大疆DJI M600Pro无人机搭载的DG3 Pros倾斜摄影系统采集影像数据;再利用PhotoScan影像匹配模块处理无人机倾斜影像获取的多视影像数据同名点坐标;然后利用GodWork的AT模块进行引入曝光延迟的光束法区域网平差,并通过分块平差与整体一致性平差实现大区域多视倾斜影像数据的整体平差;最后利用Smart3D完成多视影像密集匹配和纹理自动映射,生成高精度的三维模型.通过控制数据对空三加密、三维立体模型进行了精度验证,结果表明,其精度能满足大比例尺测图要求. 相似文献
10.
11.
介绍了遥感数字影像测绘系统ReSDISAMS(Remote-SensingDigital Image Surveying Anhd MappingSys-tem)的功能与特性，ReSDISAMS由微机图形工作站，立体观测装置和专业功能应用软件等组成。专业功能应用软件包括；数字空中三角测量（AT）、数字高程模型（DEM），数字单像测图（MP），数字立体测图（SP），数字正射影像（OP）、三维地形可视化（3D），数字航天影像测图（SAT）、数字城市（CityView)以及成果编辑输出（EOS）等。它是空间地理信息采集的有力工具。 相似文献
12.
The Landsat (MSS and TM), SPOT (PLA and MLA) and IRS (LISS-I and LISS-II) images of crop free period (April, May), rainfed crop (October) and rabi irrigated crop (January, February) have been evaluated for their capabilities of mapping (1) primary salt affected soils: (slightly, moderately and severely) (2) saline water irrigated saline soils, (3) sodic water irrigated sodic soils and (4) salt affected soils due to tank seepage in the arid region of Rajasthan. The moderately and severe salt affected soils could be mapped with Landsat, (IRS LISS-I) and SPOT, images of any season. However, the summer season imagery provided maximum extent of salt affected soils. The LISS-II imagery also provided delineation of slightly salt affected soils in addition to the moderate and severely salt affected soils. The delineation of saline and sodic water irrigated areas was possible by using Landsat False Colour Composite for the January month by their characteristic reflectance, existing cropping pattern and the quality of irrigation water being used in the area. The IRS (LISS-II) and SPOT PLA images for the May month were also used for mapping of saline and sodic water irrigated soils. 相似文献
13.
针对电离层电子密度重构问题,提出了一种综合利用总变差最小化(toalvariation,TV)与乘法代数重构算法(multiplicativealgebraicreconstructiontechnique,MART)的电离层层析成像算法。该算法对反演模型的参数施加总变差约束,以提高反演过程的稳定性和结果的精确性。通过模拟数据和实测数据对模型的重构结果进行验证,结果表明,相对于乘法代数重构算法,该算法能够有效地提高电离层电子密度的重构精度。 相似文献
14.
鄂尔多斯盆地伊盟隆起区东部微烃渗漏区的遥感识别及其意义 总被引：1，自引：0，他引：1
微烃渗漏遥感探测的机理主要是建立在烃类微渗漏异常地球化学表征和形成的基础上。本文主要依据Schum acher(1996)和Saunders等(1999)提出的烃类微渗漏异常地球化学原理和模型,以鄂尔多斯盆地伊盟隆起东部为研究区,以多光谱遥感和航空放射性遥感为探测手段,分别利用氧化铁指数(TM3/TM1)、亚铁指数(TM5/TM4)和黏土化指数(TM5/TM7)来识别Fe3 氧化物、Fe2 氧化物和有机质、黏土化和碳酸盐化的相对富集区,同时用矿物组合图像来增强显示上述信息。综合亚铁指数(TM5/TM4)分割图像、矿物组合图像、航放铀、钍、钾信息及钍归一化铀指数等信息,提取了研究区微烃渗漏地段。研究表明,研究区存在两条Fe2 氧化物和有机质相对富集区带。一条为与库布齐沙漠走向近于一致的北部近东西向带,它与石油部门发现和描述的油气渗漏区域基本一致。另一条为泊海子—准召—新庙不连续的北西向带,它的北界与泊海子—准召断裂展布基本一致。在垂直中部北西向微烃渗漏带的剖面上,清晰显示亚铁指数(Fe2 )、航放测量铀(U)、钍归一化铀(Ud)为正异常;氧化铁指数(Fe3 )、航放测量总道值(Tc)和钾(K)、钍归一化(Kd)为负异常的特点。研究认为地表还原带是由油气微渗漏形成的,推测受断裂、裂隙带控制的、主要由油气微渗漏形成的还原带对东胜铀矿带形成聚集起了重要作用。 相似文献
15.
GRACE模式确定重力场的关键技术探讨 总被引：11，自引：2，他引：11
美德合作的GRACE计划可以利用卫星跟踪卫星技术 (SST)获取有关地球重力场、大气和海洋等方面有史以来最为全面的信息。它们为广泛开展相关领域的科学研究提供了前所未有的丰富资料。其中 ,GRACE提供的稳态的和时变的地球重力场数据可以反映地球内部构造、地表水体运动等地球物理信息 ,是GRACE目标的最重要的方面。本文深入探讨了GRACE卫星有效载荷对于研究地球重力场的贡献 ,并给出相应结论。 相似文献
16.
Dhruvesh P Patel Mrugen B Dholakia N. Naresh Prashant K. Srivastava 《Journal of the Indian Society of Remote Sensing》2012,40(2):299-312
Geo-visualization concept has been used for positioning water harvesting structures in Varekhadi watershed consisting of 26
mini watersheds, falling in Lower Tapi Basin (LTB), Surat district, Gujarat state. For prioritization of the mini watersheds,
morphometric analysis was utilized by using the linear parameters such as bifurcation ratio (Rb), drainage density (Dd), stream frequency (Fu), texture ratio (T), length of overland flow (Lo) and the shape parameter such as form factor (Rf), shape factor (Bs), elongation ratio (Re), compactness constant (Cc) and circularity ratio (Rc). The different prioritization ranks were assigned after evaluation of the compound factor. 3 Dimensional (3D) Elevation
Model (DEM) from Shuttle Radar Topography Mission (SRTM) and DEM from topo contour were analyzed in ArcScene 9.1 and the fly
tool was utilized for the Geo-visualization of Varekhadi mini watersheds as per the priority ranks. Combining this with soil
map and slope map, the best feasibility of positioning check dams in mini-watershed no. 1, 5 and 24 has been proposed, after
validation of the sites. 相似文献
17.
Yangmei Zhou 《GPS Solutions》2011,15(4):325-331
Based on both the lower and the upper triangular Cholesky decomposition algorithms, the (inverse) lower triangular Cholesky
integer transformation and the (inverse) upper triangular Cholesky integer transformation are defined, and the (inverse) paired
Cholesky integer transformation is proposed. Then, for the case of high-correlation ambiguity, a multi-time (inverse) paired
Cholesky integer transformation is given. In addition, a simple and practical criterion is presented to solve the uniqueness
problem of the integer transformation. It is verified by an example that (1) the (inverse) paired Cholesky integer transformation
is very convenient and very efficient in practical computation; (2) the (inverse) paired Cholesky integer transformation is
better than both the (inverse) lower triangular Cholesky integer transformation and the (inverse) upper triangular Cholesky
integer transformation; and that (3) the inverse paired Cholesky integer transformation outperforms the paired Cholesky integer
transformation slightly in the most cases. 相似文献
18.
The current satellite clock products are computed using the ionosphere-free phase (L1/L2) and code (P1/P2) observations. Thus, if users conduct undifferenced positioning using these clock products together with C1 and P2 observations, the differential code bias (DCB) (C1–P1) should be properly compensated. The influence of DCB (C1–P1) on the undifferenced ambiguity solutions is investigated. Based on the investigation, we propose a new DCB (C1–P1) estimation method. Using it, the satellite DCB (C1–P1) can be computed. A 30-day (DOY 205–234, 2012) dual-frequency GPS data set is processed to estimate the DCB (C1–P1). Comparing the estimated results with that of IGS DCB products, the accuracy is better than 0.13 m. The performances of DCB (C1–P1) in the code-based single-point positioning, precise point positioning (PPP) convergence and wide-lane uncalibrated phase delay (UPD) estimation are investigated using the estimated DCB (C1–P1). The results of the code-based single-point positioning show that the influence of DCB (C1–P1) on the up direction is more evident than on the horizontal directions. The accuracy is improved by 50 % and reaches to decimeter level with DCB (C1–P1) application. The performance of DCB (C1–P1) in PPP shows that it can accelerate PPP convergence through improving the accuracy of the code observation. The computed UPD values show that influence of DCB (C1–P1) on UPD of each satellite is different, and some values are larger than 0.3 cycles. 相似文献
19.
In this study, we have demonstrated the capability of full polarimetric ALOS/Phased Array L-band Synthetic Aperture Radar data for the characterization of the forests and deforestation in Cambodia, to support climate change mitigation policies of Reducing Emission from Deforestation and Forest Degradation (REDD). We have observed mean backscattering coefficient (σ°), entropy (H), alpha angle (α), anisotropy (A), pedestal height (PH), Radar Vegetation Index (RVI) and Freeman–Durden three-component decomposition parameters. The observations show that the forest types and deforested area are showing variable polarimetric and backscattering properties because of the structural difference. Evergreen forest is characterized by a high value of σ° HV (?12.96 dB) as compared with the deforested area (σ° HV=?22.2 dB). The value of polarimetric parameters such as entropy (0.93), RVI (0.91), PH (0.41) and Freeman–Durden volume scattering (0.43) is high for evergreen forest, whereas deforested area is characterized by the low values of entropy (0.36) and RVI (0.17). Based on these parameters, it is found that σ° HV, entropy, RVI and PH provide best results among other parameters. 相似文献
20.
Mehmet ?ahin B. Yi?it Y?ld?z Ozan ?enkal Vedat Pe?temalc? 《Journal of the Indian Society of Remote Sensing》2012,40(3):399-409
This study introduces artificial neural networks (ANNs) for the estimation of land surface temperature (LST) using meteorological and geographical data in Turkey (26?C45°E and 36?C42°N). A generalized regression neural network (GRNN) was used in the network. In order to train the neural network, meteorological and geographical data for the period from January 2002 to December 2002 for 10 stations (Adana, Afyon, Ankara, Eski?ehir, ?stanbul, ?zmir, Konya, Malatya, Rize, Sivas) spread over Turkey were used as training (six stations) and testing (four stations) data. Latitude, longitude, elevation and mean air temperature are used in the input layer of the network. Land surface temperature is the output. However, land surface temperature has been estimated as monthly mean by using NOAA-AVHRR satellite data in the thermal range over 10 stations in Turkey. The RMSE between the estimated and ground values for monthly mean with ANN temperature(LSTANN) and Becker and Li temperature(LSTB-L) method values have been found as 0.077?K and 0.091?K (training stations), 0.045?K and 0.003?K (testing stations), respectively. 相似文献