Joint Block Adjustment Of TH-1&ZY-3 Images And Its Application In Production

Since 1972,the United States successfully launched the first earth resources satellite,marking the advent of the era of space photogrammetry.In particular,in 1985 the French commercial satellite SPOT-1,the satellite's high-resolution stereo imaging become a reality.Satellite images with no boundaries,strong periodic images,wide range of advantages,and constantly improve the resolution,gradually replaced the previous aerial photogrammetry has become the important data source of massive data map production.China started late in this field,and the main western developed countries have a certain gap.Since the twenty-first Century of 10s,China has also ushered in its own mapping satellite TH-1 and ZY-3.TH-1 and ZY-3 belong to different departments in charge,and have their own different mapping applications and security tasks.The design parameters are close,if the stereo adjustment of two kinds of image network,in some special period,in which an image or by real-time,or because of image noise alone is not enough to complete the task of Surveying and mapping,can complement each other through two kinds of image effect.This is also in the current stage,and gradually improve the use of satellite data in China,to reduce dependence on foreign data is an important means to save a lot of money for the country.Therefore,it is necessary to carry out research on the joint production of TH-1 and ZY-3.Through the study on the resources of TH-1 and ZY-3 image adjustment theory,through the ground a few control points of the system error on the attitude angle pre correction,calculates the parameters of RPC,and based on the network RPC bundle block adjustment calculation,according to the distribution of control points number and position calculation precision,the feasibility of combined adjustment.The application of the combined adjustment to the actual production has produced obvious effect.The main work and achievements are as follows:(1)Based on the analysis of the adjustment of the TH-1 and ZY-3 three line array images of resource three,the influence of the number and position of the control points on the adjustment accuracy is discussed according to the precision analysis under the condition of no control and less control.Then according to the control points and the location of the joint adjustment of the solution,to meet the accuracy of 1:5 million mapping production,the feasibility of the joint adjustment is verified.(2)Accuracy comparison based on the current widely used Supresoft and Jiwei two photogrammetry software adjustment,at the same time the photogrammetric products production process of carding,provides an effective guidance for the experience of two software users.(3)Combined with the conclusion of the joint adjustment,it is extended to the current business production tasks,effectively promoting the completion of the unit mapping navigation support tasks.At the same time,according to the feasibility of the joint adjustment and the number and position of the control points,some practical methods are summarized,which greatly improves the work efficiency.