[ncl-talk] Sub: Interpolation

[Adv]

Hi,
I have been trying to do objective analysis only over the region of
longitude from -116 to -90.35 and latitude of  40.01 to 49. While plotting
the output, the values are spreaded over the global region. I don't
understand where is wrong. It's been long I am kinda stuck with this
objective analysis. I have attached here the output figure and code too.
Could someone please help me to fix this?

begin
 strll  = asciiread("stationmac.txt", -1, "string") ;
  print(strll)   ; STATION","STATION_NAME", "LAT", "LON"
  print("=====")

sloc = str_get_field(strll , 2, ",")
  lat  = tofloat( str_get_field(strll , 3, ",")  )
  lon  = tofloat( str_get_field(strll , 4, ",")  )
  print(sloc +" : "+lat+" "+lon)
mnlat=(min(lat))
mxlat=(max(lat))
mnlon=(min(lon))
mxlon=(max(lon))
;print(lon)
print(mnlon)
print(mxlon)
print(mnlat)
print(mxlat)
mlon = 390
dlon = -90.35 / mlon
lonn  = fspan (-116, (mlon - 1) * dlon, mlon)
print(lonn)
mlat = 390
dlat = 49.0 / mlat
latt  = fspan (40.01, (mlat - 1) * dlat, mlat)
print(latt)
;gcdist = gc_latlon(mnlat,mnlon, mxlat,mxlon, 300,2)
;print(gcdist)
;print (gcdist at gclat+"  "+gcdist at gclon )
;return
;latt=gcdist at gclat
;lonn=gcdist at gclon
;print(min(latt))
;print(max(latt))
;print(max(lonn))
;print(min(lonn))
diri="/home/dailysimms/prec-obs/01/"
z1 = asciiread(diri+"PrecJan1965-2014",-1,"float")
;print(z1)
;printVarSummary(z1)
;a = (/1,2,3,4,5,6,7,8/)
;390 rows by 50 columns
a0 = onedtond(z1,(/390,50/))
;print(a0)
x=dim_avg(a0)
print(x)
set_default_fillvalue("string",  "")
zi = natgrid(lon, lat, x, lonn, latt)
print(zi)
zi!0="lat"
zi!1="lon"
zi&lat=latt
zi&lon=lonn
printVarSummary(zi)
print(zi)
  opt    = True
opt at timing = True
  rscan  = (/20,15,10, 5,3 /)
grid   = obj_anal_ic_deprecated(lon, lat, x, lonn, latt, rscan, opt)
printVarSummary(grid)
print(grid)
print(min(grid))
print(max(grid))
grid!0="lt"
grid!1="ln"
grid&lt=latt
grid&ln=lonn
printVarSummary(grid)
;return
;------------------------------------------------------------------
; plot
;------------------------------------------------------------------
  wks      = gsn_open_wks("pdf","rdm2grid")
  gsn_define_colormap(wks,"amwg")
 plot     = new(2,graphic)

  res                     = True
  res at gsnDraw             = False           ; don't draw
  res at gsnFrame            = False           ; don't advance frame
  res at cnFillOn            = True            ; turn on color
 ;res at cnLinesOn           = False           ; turn off contour lines
  res at cnLineLabelsOn      = False           ; turn off contour line labels
  res at gsnSpreadColors     = True            ; spread out color table
  res at lbLabelBarOn        = False           ; turn off individual cb's


res at gsnCenterString = "Original grid"
  plot(0) = gsn_csm_contour_map_ce(wks,zi,res)

  plot(1) = gsn_csm_contour_map_ce(wks,grid,res)
;************************************************
; create panel
;************************************************
  resP                     = True                ; modify the panel plot
 ;resP at txString            = title
  resP at gsnMaximize         = True                ; make large
  resP at gsnPanelLabelBar    = True                ; add common colorbar
  resP at lbLabelAutoStride   = True                ; Let NCL decide spacing
 ;resP at lbLabelStride       = 2                   ; force every other label
 ;resP at lbLabelFontHeightF  = 0.0125              ; make labels smaller [0.2
default]

  gsn_panel(wks,plot,(/2,1/),resP)            ; now draw as one plot

end

Warning message:
(0)    check_for_y_lat_coord: Warning: Data either does not contain a valid
latitude coordinate array or doesn't contain one at all.
(0)    A valid latitude coordinate array should have a 'units' attribute
equal to one of the following values:
(0)        'degrees_north' 'degrees-north' 'degree_north' 'degrees north'
'degrees_N' 'Degrees_north' 'degree_N' 'degreeN' 'degreesN' 'deg north'
(0)    check_for_lon_coord: Warning: Data either does not contain a valid
longitude coordinate array or doesn't contain one at all.
(0)    A valid longitude coordinate array should have a 'units' attribute
equal to one of the following values:
(0)        'degrees_east' 'degrees-east' 'degree_east' 'degrees east'
'degrees_E' 'Degrees_east' 'degree_E' 'degreeE' 'degreesE' 'deg east'
(0)    check_for_y_lat_coord: Warning: Data either does not contain a valid
latitude coordinate array or doesn't contain one at all.
(0)    A valid latitude coordinate array should have a 'units' attribute
equal to one of the following values:
(0)        'degrees_north' 'degrees-north' 'degree_north' 'degrees north'
'degrees_N' 'Degrees_north' 'degree_N' 'degreeN' 'degreesN' 'deg north'
(0)    check_for_lon_coord: Warning: Data either does not contain a valid
longitude coordinate array or doesn't contain one at all.
(0)    A valid longitude coordinate array should have a 'units' attribute
equal to one of the following values:
(0)        'degrees_east' 'degrees-east' 'degree_east' 'degrees east'
'degrees_E' 'Degrees_east' 'degree_E' 'degreeE' 'degreesE' 'deg east'
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