Analysis Of Factors Affecting The Accuracy Of Surveying And Mapping Results Obtained By UAV Surveying And Mapping Technology And Research On Practical Processing Scheme

In recent years,UAV surveying and mapping technology has developed rapidly,and has become the main means to obtain information of Surveying and mapping geographic information industry.Compared with traditional aerial photography,the advantages of UAV based aerial photography mainly lie in low cost,simple operation,fast and flexible,etc.,and its disadvantages mainly lie in the insufficient image quality of the data acquired by UAV aerial photography.In order to obtain high-precision surveying and mapping data,UAV aerial photogrammetry is used as the technical means for surveying and mapping.There are differences between field data acquisition and interior data processing between UAV and traditional aerial photogrammetry,and the standard requirements are also different.This paper studies the factors that affect the accuracy of UAV surveying and mapping results.Based on the characteristics of UAV image data,this paper studies the scheme to improve the accuracy of UAV surveying and mapping results,and verifies it through an example.This paper analyzes the factors that affect the accuracy of UAV surveying and mapping results from the theoretical level,and draws the following conclusions: the first is the ground resolution selected for image acquisition,the higher the resolution,the higher the accuracy of the results;the second is the measurement error of the image itself,which is directly related to the accuracy of the image self generated coordinates;the third is when the image is collected The higher the base height ratio is,the higher the elevation accuracy will be.Under the condition of hardware conditions,these are the main factors restricting the height accuracy of UAV surveying and mapping.How to control these factors will help to make full use of the advantages of UAV rapid surveying and mapping.Based on the analysis of the influencing factors on the accuracy of UAV surveying and mapping results,two schemes are proposed to improve the accuracy of UAV surveying and mapping results(1)Based on the characteristics of UAV,this paper studies the factors that affect the accuracy of UAV large-scale mapping,such as aerial camera,exposure delay,flight control,control point layout and so on;(2)The non metric digital camera carried by UAV is different from the traditional measurement digital camera.The unified distortion model can not be used to simulate the distortion law of the camera,which is prone to model error.In this paper,the method of image distortion correction based on grid is presented,which can effectively simulate the irregular distortion of UAV equipped with non metric digital camera,and improve the measurement accuracy of image coordinates The accuracy of the results has been verified,which can be widely used in UAV surveying and mapping;The flight altitude of UAV is low,if the terrain in the survey area fluctuates greatly,flight safety is difficult to guarantee.For aerial survey itself,the resolution of the same image or adjacent image is inconsistent.Moreover,due to the unstable attitude of UAV and large relative altitude difference,there will be large geometric distortion and radiation distortion in adjacent images,which will affect image matching.In order to avoid the emergence of these problems,this paper puts forward the idea of variable flight height route design for UAV,and puts the design idea into practice.