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相对于传统野外数字化地形测量,低空航空摄影测量周期短、成本低,能够快速获得大比例尺线划地形图和高分辨率的影像成果,为小型农田水利项目设计提供更好依据。以江西某县小型农田水利设计地形图测绘项目为例,应用小型无人机获取高分辨率影像,在进行外业控制测量基础上进行空三加密与计算,并利用立体测图软件测绘出满足规范精度要求的大比例尺线划地形图和数字正摄影像地图,证明了低空航空摄影测量在小型农田水利项目设计阶段的应用特点及优势。
Compared with the traditional field digital terrain measurement, low-altitude aerial photogrammetry has short measuring cycle and low cost, and can quickly obtain large-scale line topographic maps and high-resolution imaging results, providing a better basis for the design of small farmland water conservancy projects. Taking a small-scale farmland water conservancy design topographic mapping project in a county of Jiangxi Province as an example, a small UAV is used to acquire high-resolution images, and space-based three-dimensional encryption and calculation are conducted on the basis of field control surveys. Large-scale line drawings and digital orthographic maps required by the standard precision prove the application characteristics and advantages of low-altitude aerial photogrammetry in the design stage of small farmland water conservancy projects.