本文選題：全球離散網(wǎng)格　切入點：地球系統(tǒng)空間網(wǎng)格　出處：《測繪科學》2017年10期

【摘要】：針對目前地理信息科學領域存在的三維地理場景大都是局部的、基于投影的2.5維表面模型的問題,該文提出了利用球體大圓弧八叉樹剖分(SGOG)瓦塊建立大區(qū)域真三維地理場景的方法。將SGOG特定剖分層次的頂點與全球共享DEM數(shù)據(jù)進行匹配,構(gòu)建大區(qū)域真三維地形框架;以地形起伏度為閾值,采用不同層次的瓦塊進行自適應建模,大大減少了數(shù)據(jù)量;粘貼遙感紋理,建立虛擬地理場景。中國大陸地區(qū)的實驗結(jié)果表明:所提方法不但顧及了地球曲率,克服了投影變形的缺陷,而且可以利用SGOG多尺度特性,靈活建立各種(混合)尺度的模型,并可實現(xiàn)地表上下空間的一體化建模。
[Abstract]:In view of the problem that most of the 3D geographic scenes in the field of geographic information science are local and projection based on 2.5 dimensional surface model, In this paper, a method of constructing true 3D geographic scene in large area by using spherical large arc octree partition tile is proposed. The vertices of specific level of SGOG are matched with global shared DEM data, and the true 3D terrain framework of large area is constructed. With terrain relief as threshold, adaptive modeling with different levels of tiles can greatly reduce the amount of data, paste remote sensing texture, The experimental results in mainland China show that the proposed method not only takes into account the curvature of the earth and overcomes the defects of projection deformation, but also makes use of the multi-scale characteristics of SGOG to flexibly establish various (mixed) scale models. The integrated modeling of upper and lower surface space can be realized.
【作者單位】： 鄭州大學水利與環(huán)境學院;
【基金】：河南省科技攻關項目(152102210031) 河南省高等學校重點科研項目基礎研究計劃項目(16A170003) 鄭州大學研究生教育科研專項支持基金項目;鄭州大學大學生創(chuàng)新實驗項目(2014xjxm056)
【分類號】：P208

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