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

【摘要】：針對目前地理信息科學(xué)領(lǐng)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(diǎn)與全球共享DEM數(shù)據(jù)進(jìn)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(jìn)行自適應(yīng)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(shí)驗(yàn)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(shí)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(xué)水利與環(huán)境學(xué)院;
【基金】：河南省科技攻關(guān)項(xiàng)目(152102210031) 河南省高等學(xué)校重點(diǎn)科研項(xiàng)目基礎(chǔ)研究計(jì)劃項(xiàng)目(16A170003) 鄭州大學(xué)研究生教育科研專項(xiàng)支持基金項(xiàng)目;鄭州大學(xué)大學(xué)生創(chuàng)新實(shí)驗(yàn)項(xiàng)目(2014xjxm056)
【分類號】：P208

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本文編號：1690814