Application Of UAV Image In Disaster Investigation In Coal Mining Subsidence Area

With the progress of society and the continuous development of information technology,the corresponding spatial information technology has also been continuously improving.What follows is a large demand for spatial data.Although many countries in the world,especially developed countries,have been able to produce certain high-precision image data,in practice,the gap in the demand for spatial data is still large.For developing countries represented by Asia,Africa,and Latin America,due to the long-term existence of objective reasons such as capital and technology,it is still a challenge to solve the rapid and massive acquisition of high spatial resolution images in the short term.With the rise and popularity of drone technology,in recent years,related drone aerial survey technology has also developed rapidly and has become increasingly mature.Due to UAV aerial surveying technology has a series of advantages: for example,data production efficiency is higher,and time efficiency is stronger,so more and more social funds are invested in related research.The result is more drone aerial surveying technology.Made mature and practical.Due to the traditional aerial photogrammetry and remote sensing technologies,characteristics,and platforms,there are a series of problems in obtaining small-range,high-precision data,such as cost-effectiveness,such as production costs.Low-altitude unmanned aerial vehicles(UAVs)acquire remote sensing image data,especially for small-scale operation areas,have the characteristics of flexible mobility and low cost,and are increasingly favored by high-precision data producers,researchers and users.It also initially solved the problems existing in traditional photogrammetry and initially made up for the deficiencies of traditional remote sensing technology.The low altitude UAV system's first flight altitude is much lower than traditional aerial photogrammetry,and the flying height is below the clouds and can be closer to the target and is not affected by cloud cover,so it can be obtained more clearly.Higher quality images.Because the UAV system is small and flexible,it can carry out multiangle observations that are more compatible with topography and landform,and has more overlapping observations and image overlaps.Based on this,the stereoscopic image pairs can be extracted to create a more accurate 3D model..This dissertation takes the mining subsidence area of Luanhe River Basin as the research object,uses the low-altitude drone to collect,process and analyze the aerial survey data of the research area,and obtains the 4D product data of the research area: including orthographic DOM and digital elevation model.DEM,digital line topography DLG,etc.,and get fast.After relevant accuracy assessment,the accuracy of the obtained data basically reaches the expected goal.This research shows that low-altitude UAVs can be used for photogrammetry,which can be used to obtain 4D products in mining subsidence area in a flexible,fast,efficient,and accurate manner,for further mining subsidence areas.The monitoring and analysis provided the corresponding basic data.It has certain reference significance for further research and related exploration of mining subsidence areas.