山区地貌 文档

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1、山区地貌：在某山区测得一些地点的高程如下表：(平面区域1200≤x≤4000,1200≤y≤3600)，试作出该山区的地貌图和等高线图，并对几种插值方法进行比较．XY1200160020002400280032003600400012001130125012801230104090050070016001320145014201400130070090085020001390150015001400900110010609502400150012001100135014501200115010102800150012001100155016001550138010

2、7032001500155016001550160016001600155036001480150015501510143013001200980解通过最近邻点插值、双线性插值方法和双三次插值方法的插值效果进行比较．MATLAB程序：x=1200:400:4000;y=1200:400:3600;z=[11301250128012301040900500700;13201450142014001300700900850;139015001500140090011001060950;15001200110013501450120011501010;150012001

3、10015501600155013801070;15001550160015501600160016001550;1480150015501510143013001200980];meshc(x,y,z);图表1粗糙的地貌分布曲线图最邻近插值xi=1200:4000;yi=1200:3600;[xi,yi]=meshgrid(xi,yi);zi=interp2(x,y,z,xi,yi,’nearest’);meshc(xi,yi,zi)图表2最邻近插值双线性插值xi=1200:4000;yi=1200:3600;[xi,yi]=meshgrid(xi,yi);zi

4、=interp2(x,y,z,xi,yi,’linear’);meshc(xi,yi,zi)图表3双线性插值双三次插值xi=1200:4000;yi=1200:3600;[xi,yi]=meshgrid(xi,yi);zi=interp2(x,y,z,xi,yi,’cubic’);meshc(xi,yi,zi)图表4双三次插值