| Nowadays the popular UAV tilt photogrammetry has become the mainstream trend of 3D modeling as its convenient and flexible,low cost,multi-faceted perspective,and the characteristics of the real reduction of the target.Compared to traditional photogrammetry,tilting photogrammetry has a short development time that makes some of its aspects inadequate.Traditional photogrammetry has its own strict standards and each parameter has a rigorous range definition.But in the selection of the parameters on UAV tilt photogrammetry,the choice of many institution is usually different.For the flight height,resolution,camera's focal length,camera's tilt,etc.,and no one suggested how to choose the best.For the degree of overlap,many people even adhered a blind principle:the bigger,the better,But we usually found that Some of the collection density is too large and it existed redundant data in compute processing,or it have great impact from attitude angle,resulting in increased the difficulty of solving,reducing the efficiency.So it is an inevitable trend to make the standard of UAV tilt photogrammetry.For the above reasons,this paper's aim is improving the efficiency and trying to study the standards of UAV tilt photogrammetry.then we optimize selection of UAV tilt photogrammetry 3D modeling related parameters and analyze the allowable range of each parameter.These can provide a basic reference for the future development of standard.The main contents and innovations of this paper are as follows:(1)Introduction to tilt photogrammetry theory,some tilt cameras and systems,the characteristics and function of the tilt photogrammetry,as well as the development in home and abroad.list every parameter factors,compare the difference between the parameters of traditional and tilting conditions.(2)Compare the traditional formula of parameters,this paper first refer the resolution calculation on tilt condition,then the formula about image coverage and overlap degree is deduced by myself,it has a suitable calculation method for tilting photography.In addition,the occlusion,depth of field,ultra-focus distance,aperture and other factors are also analyzed.(3)The different values is chosen according to the mathematical relationship between the parameters,By select the optimal parameter factor and the degree of overlap of equal intervals,we let Xi'an Chanba ecological zone management committee to be the pilot area,then collect the data,solve the various groups of data in different parameters by smart 3d capture4.0,and establish the corresponding model,then compare all the date in visual and mathematical quality,at last,select a more reasonable range of values,On the one hand,it can guarantee the quality of the model,on the other hand,it also reduce redundant data and improve operational efficiency.At the same time,We first discuss the effect on overlap degree,from attitude angle,and get the maximum allowable value.(4)We last define the reasonable range of parameters which contains height,camera focus,camera inclination,aperture size,heading,side overlap and attitude angle according to analyze resolution,occlusion,depth of field,depth of focus,aperture and overlap.It is not only a unique standard on tilt conditions,but also a reference for the future standard of UAV tilt photo grammetry. |
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