Abstract
Abstract. The Ziyuan-3 (ZY-3) is the first civil high-resolution optical stereoscopic mapping satellite developed by China. It was launched on January 9, 2012, and as of January 9, 2020, it has been in a continuous operation for 8 years in orbit. The direct geolocation performances of ZY-3 based on the Rational Polynomial Coefficients (RPC) model are discussed, and the monoscopic and stereoscopic geometric accuracy of ZY-3 with ground control point (GCP) have also been studied using a bundle block adjustment with the affine correction in image space. Through the analysis of 47 sets of ZY-3 stereo data in Harbin, China, it can be found that from 2012 to 2019, the ZY-3 geolocation accuracy without GCP remains stable, with an average planimetric accuracy of approximately 16.2m, an average elevation accuracy of about 7.5m. The internal accuracy of the panchromatic triplet images is better than 1.0 pixel, the planimetric accuracy and elevation accuracy of stereo triplets and and stereo pairs are better than 2.0 meters with control points. In general, the results show that the ZY-3 satellite has been in good and stable condition during in-orbit operation in the past 8 years, and the various test indicators have been able to meet the design specifications.
Highlights
The Ziyuan-3 (ZY-3) is the first civil high-resolution optical stereoscopic mapping satellite independently developed by China
In order to evaluate the geometric accuracy of the ZY-3 stereo mapping satellite, a total of 47 sets of ZY-3 stereo data are collected in the western region of Harbin, China from January 2012 to November 2019, and a set of high-precision reference data from ADS80 can be used for accuracy analysis
The direct geolocation accuracy of mapping satellites, known as absolute geolocation accuracy, is one of the main performance indicators of satellite missions. It is mainly affected by various factors such as camera, ephemeris, attitude, etc., as it will determine the number of ground control points needed to process satellite images and has a great impact on many applications
Summary
The Ziyuan-3 (ZY-3) is the first civil high-resolution optical stereoscopic mapping satellite independently developed by China. The two cameras with 3.5 m ground sample distance (GSD) mounted on the TLC point to the forward (FWD) and backward (BWD) at 22 °off-nadir angle, and the other camera with 2.1 m GSD points directly nadir (NAD) This solution has an excellent base-to-height ratio, which is beneficial to extract DEM, and can obtain thousands of kilometers of stereoscopic data by working continuously for a long time. The ZY-3 project is mainly devoted to the operational application services of the stereo production of 1:50000 and larger scale maps, and provides data for natural resource investigation and monitoring, environmental surveying, emergency management, and national security needs. Based on the Rational Polynomial Coefficients (RPC) model, the direct geolocation accuracy of ZY-3 is discussed, and using a bundle block adjustment with the affine correction in image space, the monoscopic and stereoscopic geometric accuracy of ZY-3 with GCP have been studied
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