基于多模式集合模拟气候变化对长江流域油菜生产潜力影响研究（英文）

Rapeseed is one of the major oil crops in China and it is very sensitive to climate change.The Yangtze River Basin is the main rapeseed production area in China.Therefore,a better understanding of the impact of climate change on rapeseed production in the basin is of both scientific and practical importance to Chinese oil industry and food security.In this study,based on climate data from 5 General Circulation Models(GCMs) with 4 representative concentration pathways(RCPs) in 2011–2040(2020 s),2041–2070(2050 s) and 2071–2100(2080 s),we assessed the changes in rapeseed production potential between the baseline climatology of 1981–2010 and the future climatology of the 2020 s,2050 s,and 2080 s,respectively.The key modelling tool – the AEZ model – was updated and validated based on the observation records of 10 representative sites in the basin.Our simulations revealed that:(1) the uncertainty of the impact of climate change on rapeseed production increases with time;(2) in the middle of this century(2050 s),total rapeseed production would increase significantly;(3) the average production potential increase in the 2050 s for the upper,middle and lower reaches of the Yangtze River Basin is 0.939,1.639 and 0.339 million tons respectively;(4) areas showing most significant increases in production include southern Shaanxi,central and eastern Hubei,northern Hunan,central Anhui and eastern Jiangsu.     

无人机影像匹配点云的露天矿台阶高度计算方法

计算露天矿台阶高度是矿山测量验收工作的重要部分,对加强矿山生产监控和成本管理具有重要意义。针对传统台阶高度量测方法工作量大、效率差,难以保障测绘人员安全等问题,本文基于无人机倾斜摄影获取的露天矿点云提出了一种顾及边坡分层结构的台阶高度计算方法。该方法通过面元划分剔除平坦区域,再利用密度聚类处理坡面点云,最后通过随机抽样一致性获取台阶坡顶线和坡底线,计算台阶高度。试验结果表明,该方法可以高效、精确地量测露天矿台阶高度,对于矿区的开采作业和安全防范具有重要的应用价值。