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中文摘要：
基于地面数值影像技术的沙粒粒级信息提取研究中,数值影像质量高低直接影响到沙粒粒级信息提取精度,而适宜的采集条件是保证获得高质量数值影像的前提,为了选择适宜的采集条件进行了拍摄面积选取规则的理论推导及不同拍摄高度下影像几何变形率的研究,得到如下结论：拍摄面积应满足375M-N Wπ.N.r和L≤W=M≤N 2个条件;当其它条件一定时,应尽可能从高处拍摄,拍摄高度越高影像几何变形率越小且呈现从中心向四周逐渐增大在边缘处最大的规律。
英文摘要：
In the research of extracting information of sand particle fractions based on the ground numerical image technique,the quality of numerical image directly influences the acquisition precision.Appropriate condition of acquisition device is a precondition of gathering numerical image of high quality.For the purpose of choosing appropriate condition,this article deduces the principles of selecting photography area,and study on the geometric deformation rate under different height.Some conclusions are drawn as follows： the photography area should satisfy the two conditions 375-NM≤W≤π·N·r and L：W=M：N;As other conditions decided,should photograph as high as possible,geometric deformation rate declines as the height grows.And the rate increases gradually from the centre to the edge,achieving the maximum value in edge.
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