Abstract: Mine line infrastructure is an important part of production and construction for mining.It is restricted to effectively monitor by elongated features and limited surveying employees.Low-altitude unmanned aerial vehicle(UAV) photogrammetry has a series of characteristics,such as rapid response,short revisit,high accuracy,easy operation and low cost,which makes it possible to rapid monitoring of mine line infrastructure.This paper takes the line infrastructure from typical high-groundwater area of underground mine as example,including special railway of mine and controlling-flood dam,designs three experiments of flying altitude (above-ground-level:50,75,100 m),rapidly rebuild the model of mine line infrastructure,evaluates both horizontal and vertical accuracy of models,tests the reliability of models,and discusses the trade-off of cost and efficiency for UAV photogrammetry.The results show that low-altitude UAV photogrammetry can effectively construct the terrain of mine line infrastructure for centimeter-level,model accuracy could meet the requirement the large scale of 1:500 in horizontal level and 1:1000 in vertical level,respectively.Vegetation coverage has an evident influence on elevation values of model,and spatial relation of models is reliable.It proposes that 100m of above-ground-level is an ideal choice after trade-off of cost and efficiency.Therefore,it should combine strengths of UAVs with traditional methods to provide a strong guarantee for rapid monitoring of mine line infrastructure.

Key words: low-altitude UAV, photogrammetry, mine line infrastructure, mapping accuracy, experiment program