Comparison of Spatial Interpolation Methods of Snow Depth in the West of China

doi:10.11873/j.issn.1004-0323.2007.1.39

Abstract

Abstract:

The spatial interpolation methods of Inverse Distance Weighted (IDW), Spline and Kriging are utilized for comparison study on spatial interpolation of annual average snow depth from 113 observatories in the west of China (79.05°锝�103.57°E,27.17°锝�48.05°N). The principles of these three methods are different from each other. IDW determines cell values using a linear-weighted combination set of sample points. Spline estimates values using a mathematical function that minimizes overall surface curvature. And ordinary Kriging is a powerful statistical interpolation method which assumes that the distance or direction between sample points reflects a spatial correlation that can be used to explain variation in the surface. Compared with the unsatisfactory interpolation results of IDW and Spline, the result of ordinary Kriging is more close to the real snow depth distribution and can represents the spatial structure of snow depth distribution better. The main reasons which affect the precision are the small number of observatories and their asymmetric spatial distribution. However, the accuracy of spatial interpolation can be improved through reasonable design of sampling, combining deterministic and stochastic methods, and considering the influencing factors of snow distribution such as the terrain and climate.

Key words: Kriging, IDW, Spline, Snow depth, The west of China

鎽樿锛�

搴旂敤鍙嶈窛绂诲姞鏉冩硶銆佹牱鏉″嚱鏁版硶銆並riging娉曞涓浗瑗块儴鍦板尯(79.05°锝�103.57°E,27.17°锝�48.05°N)113涓皵璞″彴绔欒娴嬬殑骞村钩鍧囩Н闆繁搴﹁繘琛岀┖闂存彃鍊兼瘮杈冪爺绌躲�傜粨鏋滆〃鏄庡弽璺濈鍔犳潈娉曞拰鏍锋潯鍑芥暟娉曠殑鎻掑�肩粨鏋滀笌绉洩娣卞害鐨勫疄闄呭垎甯冩儏鍐垫湁涓�瀹氱殑宸紓;鏅�欿riging娉曡兘澶熷弽鏄犲嚭鐮旂┒鍖虹Н闆繁搴﹀垎甯冪殑绌洪棿缁撴瀯鐗瑰緛,涓庡疄闄呮儏鍐垫瘮杈冨惢鍚堛�傚奖鍝嶆彃鍊肩粨鏋滅簿搴︾殑涓昏鍘熷洜鏄爺绌跺尯鍐呮皵璞″彴绔欑█灏戜笖绌洪棿鍒嗗竷寰堜笉鍧囧寑銆傚彲浠ラ�氳繃鍚堢悊鐨勯噰鏍疯璁�,灏嗙‘瀹氭�ф柟娉曞拰闅忔満鏂规硶鐩哥粨鍚�,骞惰�冭檻鍦板舰銆佹皵鍊欑瓑褰卞搷绉洩鍒嗗竷鐨勫洜绱犳潵鎻愰珮绌洪棿鎻掑�肩殑绮惧害銆�

鍏抽敭璇�: Kriging娉�, 鍙嶈窛绂诲姞鏉冩硶, 鏍锋潯鍑芥暟娉�, 绉洩娣卞害, 涓浗瑗块儴鍦板尯

CLC Number:

P 208銆�

TANG Guo-dong, KE Chang-qing. Comparison of Spatial Interpolation Methods of Snow Depth in the West of China[J]. Remote Sensing Technology and Application, 2007, 22(1): 39-44.

鍞愬浗鏍�,鏌暱闈�. 涓浗瑗块儴鍦板尯绉洩娣卞害鐨勭┖闂存彃鍊兼瘮杈僛J]. 閬ユ劅鎶�鏈笌搴旂敤, 2007, 22(1): 39-44.

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