<div style="font-family: 'Times New Roman'; font-size: 16px;">Hi <br _moz_dirty="" /><br _moz_dirty="" />I want to create a contour plot from the observational data, i.e. for a 46*72 grid there are only ~ 100 points with observations, other points with missing data (I set a value as 0.0001). when I use ncl as below, I want to let those points with missing data as WHITE, but others as color. I do so in 2 ways:<br _moz_dirty="" /><br _moz_dirty="" />1) set missing data as mask<br _moz_dirty="" />2) set missing data as FillValue<br _moz_dirty="" /><br _moz_dirty="" />I do see there are values of non-0.0001 by using print, but the contour looks all white from 1) or 2). anybody tell me what is wrong?<br _moz_dirty="" /><br _moz_dirty="" />thanks a lot.<br _moz_dirty="" /><br _moz_dirty="" />Xiaoyan<br _moz_dirty="" /><br _moz_dirty="" />--------------------------------------------------------------------------<br _moz_dirty="" /> var = fbindirread("1.dat",0, (/46,72/), "float")<br _moz_dirty="" /><br _moz_dirty="" /> print(var)<br _moz_dirty="" />; var = mask(var,var.le.0.001,False) ; create artificial areas of missing data<br _moz_dirty="" /><br _moz_dirty="" /> var@_FillValue = 0.0001 ; sets _FillValue to 0.0001<br _moz_dirty="" /><br _moz_dirty="" /> res = True ; plot mods desired<br _moz_dirty="" /> res@cnFillOn = True ; turn on color<br _moz_dirty="" /> res@cnLinesOn = False ; no contour lines<br _moz_dirty="" /><br _moz_dirty="" /> plot= gsn_csm_contour_map_ce(wks,var,res)<br /></div>