在ArcGIS 10.1中我們常常會用到一些的柵格計算函數:
(1)將特定值(-9999)賦值爲0
Con("raster"==-9999,0,"raster")
(2)給空值賦予特定的值(如0)
CON(ISNULL("raster"),0,"raster")
(3)將特定的柵格值(如1)賦值爲空值
setnull("raster"==1,"raster")
(4)提取柵格數據中特些定值
(1)Pick("raster",[1,2,3,......])
(2)Slope>15,提取Slope大於15的格子,賦值爲1,其餘爲0
(3)Con("Slope">5,"Slope"),提取Slope大於5的格子,值不變
(4)工具箱中Math下面的greater工具,結果爲1和0
(5)將柵格數值在某一條件範圍內(如小於0)賦值爲0
Con("raster" <0,0,"raster")
(6)平方和開方運算
(1)Power(raster,2),Power(raster,0.5)
(2)Squre(),SquareRoot()
(7)使得影像中的多個值賦予無效值
SetNull(("raster == -32768)|("raster" == -10000),"raster")