English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

CBERS-02B was the first high resolution earth observation satellite in China, which adopted linear array push-broom sensor. The\udnadir ground resolution of the on board HR camera was 2.36 m. However, the accuracies of the on-board GPS receiver and star\udtracker were very limited due to the technical restrictions. The accuracy of direct geo-referencing by the on-board measurements of\udposition and attitude parameters was about 1 kilometre, which restrained the wide applications of the CBERS-02B imagery in the\udsurveying and mapping field. It is necessary to perform the bundle block adjustment to improve the accuracy of geo-referencing. A\udproper sensor model has to be adopted during the bundle block adjustment using strict physical sensor model with long orbit data, in\udorder to solve the problem of too many unknown exterior orientation parameters (EOPs). Several sensor models have been discussed,\udsuch as quadratic polynomial model, systematic error compensation model, orientation image model, and piecewise polynomial\udmodel. The combination of the systematic error compensation model and the orientation image model will be used to deal with the\udCBERS-02B imagery in this paper. Furthermore, three TDI-CCD linear arrays were fixed on the focal plane of the HR camera. The\udmiddle CCD array was shifted against the left and the right one. The level 1A image used in this paper was mosaicked by the three\udsub-images collected by the left, the middle and the right CCD, respectively. But there were some displacements among the three\udsub-images in the mosaicked image and the three CCD arrays may not be rigorously parallel. The angular parameter α and the\udtranslation parameters χ, γ of each CCD refer to the theoretical position on the focal plane is used to model the interior distortions, so\udthere are totally 9 interior distortion parameters, although some of them are not significant. The laboratory calibrated parameters of\udthe image sensor are usually different from the true values after launch. So a self-calibration strategy should be applied in the bundle\udblock adjustment. Plenty of automatically matched GCPs with precision of 10 meters in plane and 20 meters in height are used to\udperform the bundle adjustment. Both the systematic error compensation model and the orientation image model with the interior selfcalibration\udparameters are used in the bundle block adjustment to eliminate the systematic errors caused by the camera internal\uddistortions and to improve the precision of geo-referencing. A best combination of interior orientation parameters (IOPs) is drawn\udfrom the adjustment results with different combinations of these IOPs. Besides, there may be some gross errors in the automatically\udmatched GCPs. The gross errors among GCPs may lead to unusual variation of the exterior orientation elements by time. Methods of\udenlarging the intervals of orientation image and increasing the weights of the position and attitude observations are applied in the\udcombined bundle block adjustment to remove the influence of gross errors of GCPs. The preliminary experimental results show that\udfor longer than 1000 km orbit data, the average accuracy of self-calibrated bundle block adjustment combined with GPS and star\udtracker observations is 2 pixels better than that without self-calibration. The planar position accuracies in X and Y of check points\udare 8 m and 7 m respectively

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

BUNDLE BLOCK ADJUSTMENT WITH SELF-CALIBRATION OF LONG ORBIT CBERS-02B IMAGERY