资源三号测绘卫星影像产品精度分析与验证

Accuracy Analysis and Verification of ZY-3 Products

资源三号测绘卫星提供了多种影像产品以满足不同用户的需求。首先介绍资源三号测绘卫星多级影像产品及其制作方法,其中传感器校正产品、系统几何纠正产品、精纠正产品均带有理函数模型(rational function model,RFM),可进一步平差生产4D产品。利用登封和安平地区资源三号测绘卫星数据验证多级影像产品的定位精度和利用其制作的数字表面模型(digital surface model,DSM)和正射纠正产品(geocoded terrain corrected,GTC)的精度,系统几何纠正产品与传感其校正产品精度相同,精纠正产品无控定位精度较高,而系统几何纠正产品与精纠正产品的平差精度与传感器校正产品的精度相同。利用资源三号测绘卫星数据制作的登封地区DSM和GTC的平面中误差为2.5 m,高程中误差2.5 m,安平地区平面中误差1.6 m,高程中误差1.5 m,高程精度满足1∶50 000 DEM一级精度要求,平面精度满足1∶50 000 DOM的精度要求。

In order to meet different needs, the survey satellite ZY-3 provides users with a series of various image products. ZY-3 image products and their production methods are introduced, including sensor corrected （SC） products, geocoded ellipsoid corrected （GEC） products and enhanced geocoded ellipsoid corrected （eGEC） products, which are all provided with rational function model （RFM）~ then the adjustment methodology of 4D products is illustrated, in the experiments, two sets of ZY-3 data, the Dengfeng area data and the Anping area data are used to verify the orientation accuracies of SC, GEC, eGEC products and the model accuracies of digital surface model （DSM） products and geocoded terrain corrected （GTC） products. The results show that GEC products are of the same accuracy of SCproducts. The orientation accuracy of eGEC products is relatively high and its adjustment result is the same as SC products. The root mean square errors （RMSEs） of plane and altitude for Dengfeng area are both 2.5 m; while the values for Anping area are 1. 6 m and 1.5 m, respectively, which could be used in 1 ： 50 000 mapping.