多邊形地形要素的向量計算方法
發(fā)布時間:2018-12-26 18:55
【摘要】:對于多邊形地理要素的坡向計算,多采用算數(shù)平均法及眾數(shù)法,這種方法對于多邊形柵格數(shù)據(jù)的計算,會造成南北倒置的問題。通過對傳統(tǒng)方法的比較,提出了一種平均坡向的向量代數(shù)矢量計算方法[1],即將圖斑所包含的所有柵格單元的坡向看成為向量,圖斑的綜合坡向就等于這些向量的代數(shù)和,并通過眾數(shù)濾波、平滑等處理,其計算出的結(jié)果更符合實際應(yīng)用需求,符合人們對坡向指標(biāo)的地學(xué)描述和理解。與傳統(tǒng)的使用柵格點算術(shù)平均值表達(dá)坡向的方法相比,該算法誤差小,可克服坡向算術(shù)平均值所導(dǎo)致的坡向錯誤。
[Abstract]:For the calculation of slope direction of polygonal geographical elements, the arithmetic average method and the mode method are mostly used. This method will cause the problem of inversion of north and south for the calculation of polygon grid data. By comparing the traditional methods, a vector algebraic vector calculation method for mean slope direction is proposed. The slope direction of all the grid elements contained in the map spot is regarded as a vector, and the synthetic slope direction of the map spot is equal to the algebraic sum of these vectors. Through the processing of mode filtering and smoothing, the calculated results are more in line with the practical application requirements, and accord with the geoscientific description and understanding of slope direction index. Compared with the traditional raster point arithmetic average method, the algorithm has less error and can overcome the slope error caused by the gradient arithmetic average.
【作者單位】: 西南林業(yè)大學(xué)生態(tài)旅游學(xué)院;
【基金】:云南省科技創(chuàng)新人才計劃項目(2014HC01)
【分類號】:P208
本文編號:2392546
[Abstract]:For the calculation of slope direction of polygonal geographical elements, the arithmetic average method and the mode method are mostly used. This method will cause the problem of inversion of north and south for the calculation of polygon grid data. By comparing the traditional methods, a vector algebraic vector calculation method for mean slope direction is proposed. The slope direction of all the grid elements contained in the map spot is regarded as a vector, and the synthetic slope direction of the map spot is equal to the algebraic sum of these vectors. Through the processing of mode filtering and smoothing, the calculated results are more in line with the practical application requirements, and accord with the geoscientific description and understanding of slope direction index. Compared with the traditional raster point arithmetic average method, the algorithm has less error and can overcome the slope error caused by the gradient arithmetic average.
【作者單位】: 西南林業(yè)大學(xué)生態(tài)旅游學(xué)院;
【基金】:云南省科技創(chuàng)新人才計劃項目(2014HC01)
【分類號】:P208
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