Design And Implementation Of Remote Sensing Image Control Point Management Software Based On QGIS

Data of control point,as an important intermediate data,is gradually developing towards multisource along with the successful launch of various domestic satellites.Data of control point is often used in analysis and processing flow of remote sensing data,which is also an important data source and achievement of geometric processing and ground precise point positioning technology.Data management of control point has undergone a change from thesis form to electronic form.Management with thesis form has problems such as easy loss,difficult application and incompleteness.Although management with electronic form has addressed the above problems,it still needs to handle the problems brought by multisource data of control point at this stage,including too many types of control points,low utilization rate,untimely update and overriding,etc.It is now a hot issue in the field of remote sensing data to efficiently and comprehensively manage and store data of control point.Image matching is the process of finding corresponding points.As a technology accompanying data management of control point,high-precision processing of image matching is beneficial to later period geometric processing of image,being widely applied in image recognition,image classification and image quality inspection.On the basis of simple analysis of image matching technology,this thesis designs the control point database and performs matching operation by introducing data of control point database.Data in control point database has the features of multisource,overriding and immediacy,which would greatly improve the success rate and accuracy of control point matching-In the development environment of Visual Studio 10.0,this thesis designs the control point data management software of remote sensing image based on QGIS,by using C++as the coding language,QGIS open source library as the image operation bottom layer,Oracle software to manage data of control point,and GDAL library to achieve the generation of tile data of control point.This thesis elaborates the related technologies needed by the software,analyzes the requirements for the problems that need to be solved at present,designs the software architecture,internal and external interfaces and database of the software,and completes the modules of control point editing,control point query,image pyramid display,control point automatic matching and control point manual matching,etc.Eventually,the software has been systematically tested and analyzed,and detailed records and careful modifications have been made for the issues occurred in the testing process.The remote sensing image control point management software based on QGIS designed in this thesis comes from XX satellite image processing system and supports the management of common satellite control point data and field measured control point data.The control point data in the database can be adopted to perform simple image matching operations on the matched images,the achievement of remote sensing image control point management software based on QGIS will further promote the development of multi-source control point management,which is of the practical guiding significance for efficient management of control points and fast image matching.