Research On The Methods Of Digital Orthophoto Map(DOM) Production Using Gaofen-1Satellite Data

The technology of satellite remote sensing with the characteristic of objective,macroscopic and rapid earth observation capability, has become one of the most importanttechnology on land resources planning，decision-making and management. Gaofen-1satelliteis the first and major project satellite of high-resolution earth observation system in China.How to use the satellite data of Gaofen-1to provide services for the management of landresources and promote the data used on land resources localization is the remote sensingworkers’on land resources indispensable and sacred duty.Digital orthophoto map has been used in various industries. It is very necessary to start theexperiment and evaluation work of making digital orthophoto map using Gaofen-1satellitedata, and focused and targeted experiment the key indicators of impacting the application ofresources satellite in China, such as geometric correction accuracy，registration accuracy，band combination method，image fusion performance and mapping scale.This paper has elaborated the method of this experiment of making digital orthophoto mapusing Gaofen-1satellite data, analyzed and evaluated the result of the experiment, and madethe experiment about the key indicators of making digital orthophoto map, such as correctionaccuracy，registration accuracy，band combination method，image fusion performance andmapping scale. Based on this experiment, the author tried her best to comprehensively andobjectively accumulate experience and technical methods on making digital orthophoto mapusing Gaofen-1satellite data.The research results of this paper are including the following conclusions:(1)The correction accuracy of the WFV multispectral data and PMS data using quadraticrational function model and cubic rational function model is better than other model.(2) In the plain area, when the number of the control points changes between20and40,the accuracy of the corrected image is consistent. In the mountainous areas when the numberof the control points changes between40and60, the corrective result is better.(3)The match accuracy of the four bands of the Gaofen-1satellite WFV data is better andthose bands do not exist the mismatch between different bands. And the different bands of thePMS data exist band registration errors, but those registration errors can be eliminated by the automatic registration method.(4)For the experimental zone data, the paper shows that when using the bandcombination method of Band1,Band4*0.8+Band2*0.2and Band3,the image drawing is best.(5)The fusion experiment results for the Gaofen-1satellite data show that: the fusionimage drawing is better when using the method of pansharp transformation and principalcomponent transformation, and the HIS fusion method followed.(6) Through the experiments and analysis of this paper, the plane accuracy of the PMScorrected image can cater for the precision demand of1:2.5million scale, and the planeaccuracy of the WFV corrected image can cater for the precision demand of1:10millionscale.All those test results of this paper will make full theoretical and technical preparations for thesubsequent large scale and industrial applications of Gaofen-1satellite data, and betterprovided scientific basis for land resource strategic decision.