基于多旋翼大疆无人机的土地利用正射遥感影像的快速获取方法研究

针对常规无人机航拍系统价格高、操作复杂、灵活性差等特点,对基于多旋翼DJ无人机的土地利用正射遥感影像的快速低成本获取方法进行了研究,主要包括:无人机遥感影像的获取、鱼眼影像的镜头校正、影像匹配、影像拼接、精度评价、影像质量分析、效率分析。通过该研究,得到了利用多旋翼DJ无人机快速获取土地利用正射遥感影像的技术方法。利用该技术方法,在成都市新都区清流镇,获取到覆盖地面646 063 m~2的正射遥感影像,其影像分辨率在10 cm以内,相邻影像接边最大误差在0.60 m内,线误差和面误差均在1%以内。该影像质量好,且土地利用信息清楚而精细,农作物的类型和长势也可识别。该技术方法具有成本低、效率高、易学易用、灵活方便的优点,在平原和坝区具有极大的推广应用价值,适合点多、分散、面积小的坝区。

Study on Rapidly Obtaining Landuse Remote Sensing Image Using Dajiang Unmanned Aircraft

In order to avoid the disadvantage of high cost,complex operation and inconvenience of general unmanned air craft, and the technology of rapidly obtaining ortho-photo for landuse by using DJ unmanned aircraft at a cheap cost was discussed.It included several steps: obtaining the un-manned aircraft images, processing the images with camera lens model, matching the images with geo-coded high resolution images, mosaicing the images, evaluating accuracy and quality of the mosaic images, analyzing the efficiency of obtaining the mosaic images. The technology was developed here, which was used to rapidly obtaining ortho-photo for landuse based on DJ unmanned aircraft.The orthophoto covering the ground area of 646063 m2 was obtained by the technology in Qinliu town of Xindu district of Chengdu city.The resolution of the ortho-photo was above 10 cm.The error of mosaic was less than 0.60 m and the error of line length and area were both less than 1%. The quality of the ortho-photo is fine, and the detail of landuse and farm vegetation can be identified in the ortho-photo.The technology has the advantages of low cost,high efficiency,easy to learn,easy to use ,flexible and application value in plain and dam area.It is suitable for the dam area with many points,scattered and small area.