發(fā)布時間：2018-05-06 05:13

  本文選題：線化簡 + 空間關(guān)系約束��； 參考：《測繪學報》2017年04期

【摘要】：線要素化簡在制圖表達與綜合領(lǐng)域一直是研究的熱點和難點之一。然而,經(jīng)典化簡算法多針對單獨線要素進行處理,缺乏對該線要素與周邊線要素之間整體空間關(guān)系的考慮,并且,存在計算結(jié)果生硬(D-P算法)、局部極值點缺失,特別是在曲度較大之處出現(xiàn)相交異常(L-O算法)等問題。為此,本文提出一種顧及空間關(guān)系約束的線化簡算法,建立線要素全局化簡方法(LGSM)和矢量位移、面積位移等5類評價指標。采用等高線、河流和道路3類線要素實際數(shù)據(jù)進行了試驗,充分檢驗了本文算法的優(yōu)越性,其處理結(jié)果符合開方根模型規(guī)律,降低了曲線復雜度,在保證全局空間關(guān)系不變條件下,不僅更好地保持了曲線整體形狀特征,而且光滑美觀、精度高。
[Abstract]:Line element simplification has always been one of the hot and difficult points in the field of cartographic representation and generalization. However, the classical simplification algorithm mostly deals with the single line element, which lacks the consideration of the overall spatial relationship between the line element and the peripheral line element. Moreover, there is a stiff D-P algorithm and the local extremum is missing. Especially when the curvature is large, there are some problems such as intersection anomaly and L-O algorithm. Therefore, this paper presents a linear simplification algorithm which takes into account the constraints of spatial relations, and establishes five kinds of evaluation indexes, such as global simplification of line elements (LGSM) and vector displacement and area displacement. By using the actual data of contour line, river and road, the superiority of this algorithm is fully tested. The processing result accords with the law of square root model and reduces the complexity of curve. Under the condition that the global spatial relationship is invariant, not only the whole shape of the curve is kept better, but also the curve is smooth and beautiful, and the precision is high.
【作者單位】： 山東科技大學測繪科學與工程學院;中國測繪科學研究院;東華理工大學測繪工程學院;
【基金】：國家科技支撐計劃(2015BAJ06B01) 測繪地理信息公益性行業(yè)科研專項(201512027) 國家基礎(chǔ)測繪項目(A1615)~~
【分類號】：P208
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本文編號：1850932