无人机低空摄影测量在农村土地确权中的应用研究
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摘要
针对我国当前农村土地利用情况和权属确认过程中对大比例尺正射影像底图的迫切需求,成本较高、效率低等特征的传统测量制图方式已很难满足需求的问题。基于某县土地确权任务中正射影像生产项目对无人机低空摄影测量技术制作正射影像的制作流程进行了系统介绍,并选取部分空三完成后影像上明显特征点坐标与实际量测坐标进行比较。结果表明:在总体工作量很大并保持稳定的情况下,精度满足大比例尺的测图要求,得出无人机低空摄影在土地经营权确权中具有很强的可行性与实用性。
In view of the current situation of rural land use and the urgent demand for large scale orthophoto map in the process of ownership confirmation,the traditional surveying and mapping method with high cost and low efficiency has been difficult to meet the demand. Based on the orthophoto production project in a county's land rights confirmation task,this paper systematically introduces the production process of the orthophoto produced by UAV low-altitude photogrammetry technology,and selects the coordinates of obvious feature points on the image after the completion of part of the space three and compares them with the actual measured coordinates. The results show that the accuracy meets the requirements of large scale mapping under the condition that the overall workload is large and stable,and it is concluded that the UAV low-altitude photography has strong feasibility and practicability in the confirmation of land management right.
In view of the current situation of rural land use and the urgent demand for large scale orthophoto map in the process of ownership confirmation,the traditional surveying and mapping method with high cost and low efficiency has been difficult to meet the demand. Based on the orthophoto production project in a county's land rights confirmation task,this paper systematically introduces the production process of the orthophoto produced by UAV low-altitude photogrammetry technology,and selects the coordinates of obvious feature points on the image after the completion of part of the space three and compares them with the actual measured coordinates. The results show that the accuracy meets the requirements of large scale mapping under the condition that the overall workload is large and stable,and it is concluded that the UAV low-altitude photography has strong feasibility and practicability in the confirmation of land management right.
引文
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[2] Gao Y,Shen XB. Improving Ambiguity Convergence in CarrierPhase based Precise Point Positioning[A]. IONGPS2001. Salt-Lake City Utah,USA[C]. 2001.
[3] Ke Y,Sukthankar R. A more distinctive representation for lo-cal image descriptors[A]. Proceedings of the 2004 IEEE Com-puter Society Conference on Computer Vision and Pattern Rec-ognition(CVPR04)[C]. 2004:511-517.
[4] Snavely N. Seitz S M,Szeliski R. Photo tourism:Exploringphoto collections in 3D[J]. ACM Transactions on Graphics,2006(3):835-846.
[5]张剑清,潘励.摄影测量学[M].武汉:武汉大学出版社,2003.
[6]王永明,王贵锦.图像局部不变特征与描述[M].北京:国防工业出版社,2010.
[7]张曼祺.基于线特征的多源遥感影像配准研究[D].南京:河海大学,2006.
[8]李芳芳,肖本林,贾永红,等. SIFT算法优化及其用于遥感影像自动配准[J].武汉大学学报(信息科学版),2009,34(10):1245-1249.
[9]严磊,汪增福.基于多局部特征匹配的全自动图像拼接[J].计算机应用与软件,2010(10):5-8.