missing data

From: Xiaoyan Ma <xiaoyan.ma_at_nyahnyahspammersnyahnyah>
Date: Wed Oct 05 2011 - 10:27:55 MDT
Hi

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:

1) set missing data as mask
2) set missing data as FillValue

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?

thanks a lot.

Xiaoyan

--------------------------------------------------------------------------
  var = fbindirread("1.dat",0, (/46,72/), "float")

 print(var)
;  var = mask(var,var.le.0.001,False)                 ; create artificial areas of missing data

  var@_FillValue       = 0.0001                   ; sets _FillValue to 0.0001

  res                  = True                      ; plot mods desired
  res@cnFillOn         = True                      ; turn on color
  res@cnLinesOn        = False                ; no contour lines

  plot= gsn_csm_contour_map_ce(wks,var,res)

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Received on Wed Oct 5 10:29:04 2011

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