低空UAV航测地面分辨率影响因素分析

Analysis on Ground Sample Distance Issues of Low-Altitude Unmanned Aerial Vehicle Survey

低空无人机摄影测量系统的姿态对后续数据处理和应用有着非常重要的影响。与传统航测相比,无人机更容易受到气流等天气因素的影响,造成俯仰、滚动和航偏等姿态角的剧烈变化。姿态的不稳定不仅降低了图像质量,而且还影响地面分辨率等一系列问题。本文介绍了无人机飞行平台的类型、常见的几种搭载数码相机及低空航测的光学特性,并对低空无人机摄影测量成图的不稳定时姿态、航高、焦距对影像地面分辨率的影响进行了讨论和分析。

The attitude of low-altitude UAV photogrammetry system has a very important influence on the subsequent data processing and application. Compared with the traditional aerial survey, the UAV is more susceptible to weather factors such as air currents, causing drastic changes in attitude such as pitch, roll and yaw. The instability of posture not only reduces the image quality, but also affects a series of problems such as ground resolution. We introduced the classification of UAV flight platform, several common digital cameras and low-altitude aerial survey optical character- istics in this paper. And the effects of attitude, altitude and focal length on the ground resolution of the image were discussed and analyzed when it is unstable.