Error Analysis Of Digital Orthophoto Map Of Small Consumer Uavs

With the continuous development of geographic information and remote sensing technology,the demand for remote sensing data in all walks of life has also increased rapidly.The way of remote sensing data acquisition has been mainly based on satellite remote sensing and aerial remote sensing of large aircraft.In recent years,the UAV remote sensing as a new method of remote sensing,has highlighted advantages of low cost,short period,high efficiency,flexible and high image resolution.It becomes a powerful complement of acquisition of remote sensing data,especially shows a great advantage in sudden natural disasters and complex terrain where is difficult for rescuers to enter.Professional UAV remote sensing technology has gone through many years and this technology is increasingly more mature,but for individuals and ordinary business users,it is still constrained by price and postprocessing software conditions.With the promotion of UAV technology and marketization,more and more small consumer UAVs have attracted consumers' attentions.Taking such a low cost small consumer level UAV as a platform to get high-quality orthophoto,it will have great significance for the popularization and development of UAV remote sensing technology.The main contents and conclusions of this paper are as follows:(1)analyze the advantages and disadvantages of small consumption level UAV remote sensing,compare the small consumption level UAV remote sensing system with the conventional professional UAV remote sensing system.(2)analyze the causes of the error sources and geometric distortion of small consumption level UAV remote sensing image,including the influence of aberration,exterior orientation elements and terrain undulation of digital camera lens.It also expounds the notices of unmanned aerial vehicle image data acquisition and the necessity of data inspection,and the control methods of small consumer UAV error.(3)combined with the mapping requirements of different scale orthophoto ground resolution,taking Huaxi campus of Guizhou Normal University as an experimental area,the quality of aerial data of UAV is checked by different aerial height aerial photography,and 1:1000 and 1:2000 scale DOM production is completed.(4)the beam triangulation method is used to calibrate the ortho images with different number of ground control points,and the polynomial correction method is used to compare them.The results show that:(1)only a small amount of ground control points can be met with a small amount of ground control points in the aerial triangulation by using the beam method.(2)the results of the aerial triangulation in the bundle area network are better than the polynomial correction method.The final results of the two correction methods can meet the accuracy requirements of 1:2000 and 1:1000 large scale orthophoto.