Interpolation error using the linint2 of NCL

Hello

I tried to interpolate using linear interpolation (the linint2) but, failed.
There appears warning.

warning: linint2: xi, yi, xo, and yo must be monotonically increasing.

However, I checked xi,yi,xo,yo through the print, they are monotonically
increasing

When I print the output(fo), value is -999.

How do i modify code to interpolate?

*(xi, yi)*
=======================================================
Variable: psfc
Type: float
Total Size: 1039680 bytes
            259920 values
Number of Dimensions: 2
*Dimensions and sizes: [lat_0 | 361] x [lon_0 | 720]*
Coordinates:
            lat_0: [90..-90]
            lon_0: [ 0..359.5]
Number Of Attributes: 12
  initial_time : 06/06/2011 (00:00)
  forecast_time : 0
  level : 0
  level_type : Mean sea level (Pa)
  parameter_template_discipline_category_number : ( 0, 0, 3, 1 )
  parameter_discipline_and_category : Meteorological products, Mass
  grid_type : Latitude/longitude
  _FillValue : -999
  units : Pa
  long_name : Pressure reduced to MSL
  production_status : Operational products
  center : US National Weather Service - NCEP (WMC)

*(xo,yo)*
=========================================================
Variable: fo
Type: float
Total Size: 884736 bytes
            221184 values
Number of Dimensions: 2
*Dimensions and sizes: [384] x [576]*
Coordinates:
Number Of Attributes: 1
  _FillValue : -999
=========================================================

*Detailed code*
=========================================================
    begin

      fP = addfile("./gfs.t00z.pgrb2f00.nc","r")

      psfc = fP->PRMSL_P0_L101_GLL0
      lon = fP->lon_0
      lat = fP->lat_0
      psfc@_FillValue=-999.

      fC = addfile("./cami_1980-01-01_0.47x0.63_L26_c071226_org.nc","r")
      LON = fC->lon
      LAT = fC->lat

      fo=linint2(lon,lat,psfc,False,LON,LAT,0)

      print (fo)

     end

-- 
-- 
In-Won Kim
Intergrated Climate System Modeling Lab.
Department of Environmental Atmospheric Sciences
599-1 Daeyeon-dong, Nam-gu
Pukyong National University,
Busan, S.Korea
Tel. +82-51-629-6643
Fax +82-51-629-7991

_______________________________________________
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Thu Jun 14 19:34:35 2012