SPOT5 geometric image quality

Bouillon, A.; Breton, Eric; Lussy, F. de; Gachet, R.

doi:10.1109/igarss.2003.1293757

Cited by 28 publications

(25 citation statements)

References 1 publication

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“…Meanwhile, a horizontal error of about 15 m was found for the ZY-3 stereo imagery [8]. Similar investigations have been carried out for various images, such as SPOT [9,10] and Pleiades [11,12].…”

Section: Introductionmentioning

confidence: 53%

Optical Satellite Image Geo-Positioning with Weak Convergence Geometry

Zhang

Wang³

et al. 2018

IJGI

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High-resolution optical satellites are widely used in environmental monitoring. With the aim to observe the largest possible coverage, the overlapping areas and intersection angles of respective optical satellite images are usually small. However, the conventional bundle adjustment method leads to erroneous results or even failure under conditions of weak geometric convergence. By transforming the traditional stereo adjustment to a planar adjustment and combining it with linear programming (LP) theory, a new method that can solve the bias compensation parameters of all satellite images is proposed in this paper. With the support of freely available open source digital elevation models (DEMs) and sparse ground control points (GCPs), the method can not only ensure the consistent inner precision of all images, but also the absolute geolocation accuracy of the ground points. Tests of the two data sets covering different landscapes validated the effectiveness and feasibility of the method. The results showed that the geo-positioning performance of the method was better in regions of smaller topographic relief or for satellite images with a larger imaging altitude angle. The best accuracy of image geolocation with weak convergence geometry was as high as to 3.693 m in the horizontal direction and 6.510 m in the vertical direction, which is a level of accuracy equal to that of images with good intersection conditions.

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Section: Introductionmentioning

confidence: 53%

Optical Satellite Image Geo-Positioning with Weak Convergence Geometry

Zhang

Wang³

et al. 2018

IJGI

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“…First, the EFP Multi-functional bundle adjustment can process not only the long image (about 1000 km), but also the short image (at least 60 km) using whole three intersection areas . Second, during photographing, there are low-frequency errors of the attitude determination system (Wang Renxiang et al, 2011), which may be caused by in-flight time and latitude using star tracker (Bouillon et al, 2003). This phenomenon will make the exterior orientation parameters involving the errors of low-frequency and lead to the large errors of position.…”

Section: The Efp Multi-functional Bundle Adjustmentmentioning

confidence: 99%

“…This phenomenon will make the exterior orientation parameters involving the errors of low-frequency and lead to the large errors of position. In SPOT5 satellite, the latitudinal model (Bouillon et al, 2003) was proposed to correct attitude using approximately 20 calibration sites data. However, the EFP Multi-functional bundle adjustment can compensate lowfrequency errors using stereo image themselves without the calibration sites data.…”

Section: The Efp Multi-functional Bundle Adjustmentmentioning

confidence: 99%

The System Overview and Geometric Image Quality of the Th-1 Satellite

Wang

2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:The Tian-Hui 1 (TH-1) is the first stereo mapping transmission satellite in China, and the primary mission goal of the satellite is for topographic mapping at 1:50,000 scale without Ground Control Points (GCPs). 1st, 2nd and 3rd satellite of TH-1 was launched on August 24, 2010, May 6, 2012 and October 26, 2015. In TH-1 satellite, many payloads are put on a small satellite platform, which has a low cost. The optical camera of TH-1 includes Line-Matrix CCD (LMCCD) camera, high resolution camera and multispectral camera with 60 km ground swath width. To get high geometric accuracy without GCPs, the on-orbit calibration camera parameters and the Equivalent Frame Photo (EFP) Multi-functional bundle adjustment are proposed and realized in ground image processing of TH-1. In order to evaluate the location accuracy of TH-1, some testing fields are established. All GCPs of testing fields are measured by GPS. The GCPs are not participated the EFP Multi-functional bundle adjustment, and are only as Check Points (CPs) to evaluate the location accuracy. The evaluation of 1st satellite is shown: the horizontal accuracy is 10.3 m (RMSE) and the vertical accuracy is 5.7 m (RMSE) without GCPs, which can satisfy for topographic mapping at 1:50,000 scale. The overviews of TH-1 satellite are described in this paper: First, the system overview is introduced, including mission and optical camera of TH-1. Then, the on-orbit calibration camera parameters using LMCCD image and the EFP Multi-functional bundle adjustment are presented. Finally, the location performance is analysed without GCPs and with different number of GCPs. In addition, the products of TH-1 are introduced.

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“…It can be seen from the results in Figure 10 that there exists obvious variation in the direct geolocation accuracy with the imaging time along the latitude in the imaging data, and the positioning accuracy fluctuated slowly within one strip along the latitude and descended on average from RMSE-Plane 3 pixels on 2 July 2016, to RMSE-Plane 10 pixels on 30 August 2016. SPOT5 personnel established a latitudinal model to take into account this variation and guarantee the consistency of location performance based on approximately 20 calibration sites with a worldwide distribution [32]. Given the limited number of high quality testfields in China, it is necessary to conduct research on the local coherence under a few GCPs or even without to determine the sources of the effects and perturbations as well as their frequencies and magnitudes.…”

Section: Aspects Of Geometrical Accuracy Assessment Parametersmentioning

confidence: 99%

Geometric Potential Assessment for ZY3-02 Triple Linear Array Imagery

et al. 2017

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ZiYuan3-02 (ZY3-02) is the first remote sensing satellite for the development of China's civil space infrastructure (CCSI) and the second satellite in the ZiYuan3 series; it was launched successfully on 30 May 2016, aboard the CZ-4B rocket at the Taiyuan Satellite Launch Center (TSLC) in China. Core payloads of ZY3-02 include a triple linear array camera (TLC) and a multi-spectral camera, and this equipment will be used to acquire space geographic information with high-resolution and stereoscopic observations. Geometric quality is a key factor that affects the performance and potential of satellite imagery. For the purpose of evaluating comprehensively the geometric potential of ZY3-02, this paper introduces the method used for geometric calibration of the TLC onboard the satellite and a model for sensor corrected (SC) products that serve as basic products delivered to users. Evaluation work was conducted by making a full assessment of the geometric performance. Furthermore, images of six regions and corresponding reference data were collected to implement the geometric calibration technique and evaluate the resulting geometric accuracy. Experimental results showed that the direct location performance and internal accuracy of SC products increased remarkably after calibration, and the planimetric and vertical accuracies with relatively few ground control points (GCPs) were demonstrated to be better than 2.5 m and 2 m, respectively. Additionally, the derived digital surface model (DSM) accuracy was better than 3 m (RMSE) for flat terrain and 5 m (RMSE) for mountainous terrain. However, given that several variations such as changes in the thermal environment can alter the camera's installation angle, geometric performance will vary with the geographical location and imaging time changes. Generally, ZY3-02 can be used for 1:50,000 stereo mapping and can produce (and update) larger-scale basic geographic information products.

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SPOT5 geometric image quality

Cited by 28 publications

References 1 publication

Optical Satellite Image Geo-Positioning with Weak Convergence Geometry

Optical Satellite Image Geo-Positioning with Weak Convergence Geometry

The System Overview and Geometric Image Quality of the Th-1 Satellite

Geometric Potential Assessment for ZY3-02 Triple Linear Array Imagery

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