Key Technology Of High Precision Geometric Processing And Evaluation Of Mapping Efficiency For ZY-3 Remote Sensing Image

Satellite remote sensing image has become one of the most important data sources of production and updating of geographic information products. The ZY-3 satellite which has been successful launched in January 2012 is a new generation of the stereo mapping satellites of our country, Satellite project's main objective is to satisfy our country and the world 1:50000 scale fundamental geographic information products production and update of larger scale geographic information products, End the history that our country has long been dependent on foreign satellite image source to promote 1:50000 scale mapping. Successfully achieve this goal is based on the satellite platform and in-orbit operation state of the overall technical indicators should reach a high level of design requirements. And the key to successfully achieve this goal is the satellite image data ground high-precision processing and the construction of application ability. The characteristics of surveying and mapping satellite is to have the strong ability of stereoscopic observation, the difficulty lies in the high geometric accuracy requirements.The paper closely around the thread that security ZY-3 satellite images to meet the requirements of 1:50000 scale stereo mapping. According to the characteristics of the ZY-3 satellite imaging, the theory and key technology of high precision geometric processing of remote sensing image are studied in depth. Based on the fundamental geographic information products standards and production specifications, a more comprehensive quantitative analysis has been used to analyze applicability of ZY-3 satellite images in the 1:50000 and 1:25000 scale mapping application. The main research contents and innovative results are as follows:1) Research of the ZY-3 satellite geometry processing modelDetailed introduces the geometric imaging methods of ZY-3 satellite, and the construction method of satellite attitude model and satellite orbit model of ZY-3 satellite. On the basis of this, the rigorous sensor model of ZY-3 satellite is established. Summarize the basic principle and results form of ZY-3 satellite on orbit geometric calibration, this paper expounds the concept of rational function model(RFM) and method of building RFM based on the rigorous sensor model which lays a theoretical foundation for the research of high precision geometry processing of ZY-3 satellite image.2) Systematic research of the high quality production technology and method of ZY-3 satellite image productsThe error types, the error propagation rules and the influence of the geometric precision of the image are systematically analyzed. Sort out the contents of the error which is needed to deal with and eliminated in the production processing of ZY-3 satellite image. In view of the special requirements of ZY-3 satellite services in the field of Surveying and mapping, When the geometric accuracy and stereo capability are considered as the primary index, the establishment of ZY-3 satellite remote sensing image products classification method suitable for mapping applications. Study the technology of sensor corrected image using virtual reimaging technology in depth, on the basis of the real inner and exterior orientation elements of the satellite, completely ideal a non-distortion camera (without lens distortion, no focal length and the main point error that has ideal linear CCD line array which length equal to the camera width). An ideal orbital motion state has been made for the ideal camera (no Integral time hopping, no attitude jitter, no track noise, etc.). The virtual image of the ideal camera is generated by resampling the original image, which sensor corrected image has no distortion of ideal line center projection. The research design the production technology method of geometric corrected products at all levels of ZY-3 satellite image with RFM, so that the geometric corrected image products not only have the genocoding and projection information, but also can be used for the subsequent stereo photogrammetry processing.3) Systematic study of the high precision SRTM-Aided Block djustment Without the use of GCPs This paper designed a stereo images block adjustment with without ground control points(GCPs) by using SRTM as height constraint based on the characteristic that the actual accuracy of SRTM data in flat terrain or local area is much higher than the nominal accuracy. Set SRTM as the initial elevation value of ground coordinate of the tie points by constructing a larger area network and match tie points densely. Ensure the elevation value of ground coordinate of the tie points that distributed in flat terrain area (according to the experience, the accuracy of SRTM is higher in this kind of area.) reaching SRTM elevation strictly during the block adjustment process. Finally, achieve the overall promotion of image elevation accuracy in a large range area. By using Hubei Province as the experimental area, the experimental results show that with the block adjustment scheme, the elevation root mean square error of the ZY-3 stereo image is better than 2.5 meters without GCPs which reached the elevation accuracy requirements of the 1:50000 scale mapping application in our country. In view of the problem that the Block Adjustment for Satellite Images With Weak Convergence Geometry cannot be solved correctly, this paper proposes the plane area network adjustment method using SRTM as the elevation control. Solve the plane coordinates of tie points only during the adjustment of updating ground coordinates of tie point, elevation value is obtained by interpolation using DEM. Finally, the block adjustment is solved correctly, and the image orientation accuracy is improved.4) Systematic demonstration and analysis of the 1:50000 and 1:25000 scale mapping capabilities of ZY-3 satellite images.In this paper, the research constructs a quantitative evaluation method for theoretical accuracy of sensor corrected image products without GCPs and with GCPs based on the geometric imaging mechanism of ZY-3 satellite and error sources. On this basis, theoretical analysis and quantitative evaluation of applicability of image geometric positioning accuracy, spatial resolution, spectral resolution, time resolution, stereo image model and other aspects in different scale mapping applications have been made respectively by referring to the production technical specifications of fundamental geographic information products in different scales of our country so that comprehensive and systematic analysis and demonstration of the ZY-3 satellite image mapping efficiency has been made. The results show that the overall performance of the ZY-3 satellite image without GCPs has reached the requirements of the 1:50000 scale stereo mapping in the hilly and mountainous terrain; the overall performance of ZY-3 satellite images with GCPs can meet the requirements of the 1:50000 scale stereo mapping, the geometric precision can meet requirements of 1:25000 scale stereo mapping accuracy.