數(shù)字地形分析中適宜分析窗口選擇方法的評價
發(fā)布時間:2018-07-15 12:33
【摘要】:基于柵格DEM(digital elevation model)計算局域地形屬性時,所采用的分析窗口將直接影響數(shù)字地形分析結(jié)果,因此在實際應(yīng)用中應(yīng)選擇適宜分析窗口。由于地形條件是隨空間變化的,因此隨空間變化的適宜分析窗口應(yīng)比通常所用的全局固定的3×3窗口更為合理。目前通過定量計算獲得隨空間變化適宜分析窗口的方法是多窗口局部地表形態(tài)刻畫法。選用3個具有不同地形特征的研究區(qū),在不同分辨率下分別將坡度、剖面曲率用于該方法來確定適宜分析窗口,對實驗結(jié)果進行分析評價。結(jié)果表明,當利用不同地形信息時,所得的適宜分析窗口情況明顯不同。進一步的實驗分析發(fā)現(xiàn),與傳統(tǒng)所用的全局固定3×3窗口相比,該方法所識別出的隨空間變化的適宜分析窗口結(jié)果對于實際應(yīng)用結(jié)果沒有明顯差別。因此該方法有效性存疑,尚不能作為確定適宜分析窗口的有效方法,還需進一步開展方法研究,以設(shè)計出合理有效的方法來識別隨空間變化的適宜分析窗口。
[Abstract]:When calculating local terrain properties based on grid Dem (digital elevation model), the analysis window used will directly affect the results of digital terrain analysis, so the suitable analysis window should be selected in practical application. Because terrain conditions vary with space, the suitable analysis window with spatial variation should be more reasonable than the commonly used 3 脳 3 window. At present, the multi-window local surface shape description method is obtained by quantitative calculation. Three study areas with different topographic characteristics were selected and the slope and profile curvature were used to determine the suitable analysis window at different resolutions. The experimental results were analyzed and evaluated. The results show that the suitable analysis window is obviously different when different terrain information is used. Further experimental analysis shows that compared with the traditional global fixed 3 脳 3 window, the suitable analysis window results with spatial variation are not significantly different from the practical application results. Therefore, the validity of this method is doubtful and can not be used as an effective method to determine the appropriate analysis window, and further research is needed to design a reasonable and effective method to identify the suitable analysis window with spatial variation.
【作者單位】: 西安地圖出版社;中國科學院地理科學與資源研究所資源與環(huán)境信息系統(tǒng)國家重點實驗室;中國科學院大學資源與環(huán)境學院;江蘇省地理信息資源開發(fā)與利用協(xié)同創(chuàng)新中心南京師范大學地理科學學院;
【基金】:國家自然科學基金(41422109,41431177)~~
【分類號】:P208;P217
[Abstract]:When calculating local terrain properties based on grid Dem (digital elevation model), the analysis window used will directly affect the results of digital terrain analysis, so the suitable analysis window should be selected in practical application. Because terrain conditions vary with space, the suitable analysis window with spatial variation should be more reasonable than the commonly used 3 脳 3 window. At present, the multi-window local surface shape description method is obtained by quantitative calculation. Three study areas with different topographic characteristics were selected and the slope and profile curvature were used to determine the suitable analysis window at different resolutions. The experimental results were analyzed and evaluated. The results show that the suitable analysis window is obviously different when different terrain information is used. Further experimental analysis shows that compared with the traditional global fixed 3 脳 3 window, the suitable analysis window results with spatial variation are not significantly different from the practical application results. Therefore, the validity of this method is doubtful and can not be used as an effective method to determine the appropriate analysis window, and further research is needed to design a reasonable and effective method to identify the suitable analysis window with spatial variation.
【作者單位】: 西安地圖出版社;中國科學院地理科學與資源研究所資源與環(huán)境信息系統(tǒng)國家重點實驗室;中國科學院大學資源與環(huán)境學院;江蘇省地理信息資源開發(fā)與利用協(xié)同創(chuàng)新中心南京師范大學地理科學學院;
【基金】:國家自然科學基金(41422109,41431177)~~
【分類號】:P208;P217
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