[ncl-talk] Hovmoller 2d lat and 2d lon rectangular grid

[David Adams]

Hi NCLers,

I have managed to get GOES IR data from curvilinear to rectangular grids.
Lat and Lon are still 2d, however.   But the code I have for the Hovmoller
diagrams gives this error.  I am sure I am just not reading the data
correctly.

The error, ncl code and ncdump of the file follow:

thanks,
Dave

----------------------  error
------------------------------------------------------
warning:IrTransInitialize: error creating spline approximation for
trYCoordPoints; defaulting to linear
fatal:ContourPlotDraw: CPCICA - ONE OF THE CORNER POINTS OF THE CELL ARRAY
IS INCORRECT
fatal:ContourPlotDraw: draw error
fatal:ContourPlotDraw: draw error
fatal:PlotManagerDraw: error in plot draw
fatal:_NhlPlotManagerDraw: Draw error

------------------------  NCL Code Snippet
-----------------------------------------------
diri = "./"
   fili = systemfunc("ls goes1*.nc")

   print(fili)
   nfili= dimsizes(fili)
   print("nfili="+nfili)

   f    = addfiles(diri+fili,"r")
   d    = f[:]->data              ; float data(time, yc, xc)  ; data:type =
"IR" ;
   d at _FillValue = 330
   lat = f[:]->lat
   lon = f[:]->lon
   time= f[:]->time

   nl     = 600
   dhov = d(:,nl,:)    ; (time,longitude)  ; <== plot
; Fix the variable so it has recognizable missing data
;*********************************

   lat2d  = f[:]->lat
   lon2d  =  f[:]->lon
   d at lat2d = lat2d        ; (yc, xc)
   d at lon2d = lon2d

 crTime  = f[:]->crTime     ; assorted info
   crDate  = f[:]->crDate
   lineRes = f[:]->lineRes
   elemRes = f[:]->elemRes

;*********************************
; create plot
;*********************************
   fNameBase = str_get_field(fili,1,".") + str_get_field(fili,2,".")

  ;pltName = fNameBase
   pltName = "goes_4"
   pltType = "pdf"                              ; "ps", "eps", "pdf",
"png","x11"
   pltDir  = "./"

   wks = gsn_open_wks(pltType, pltDir+pltName)
   gsn_define_colormap(wks,"BlAqGrYeOrReVi200"); specify a color map

   res                     = True
   res at cnFillOn            = True            ; turn on color
  res at cnFillMode          = "RasterFill"    ; cell mode
   res at cnLinesOn           = False           ; Turn off contour line
;   Create longitude labels on the x-axis
   res at gsnSpreadColors     = True            ; use full colormap
   res at gsnAddCyclic        = False           ; data not cyclic
   res at gsnMaximize         = True            ; ps, pdf, pdf
   res at pmTickMarkDisplayMode = "Always"      ; use NCL default
   res at lbLabelAutoStride   = True            ; let NCL decide spacing
   res at cnLevelSelectionMode = "ManualLevels"  ;"ExplicitLevels"
   res at cnMinLevelValF       = 180.0                            ; set the
minimum contour level
   res at cnMaxLevelValF       = 310.                          ; set the
maximum contour level
   res at cnLevelSpacingF      = 5.0                            ; set the
contour interval
   res at cnRasterSmoothingOn  = True
   res at lbLabelStride        = 5.0             ; every other label bar label

  plot = gsn_csm_contour(wks,dhov(:,:), res)
---------------------------------------------------------------------------------------------------------

netcdf goes13_4_2013_210_2002_1byte_rect {
dimensions:
    xc = 2720 ;
    yc = 1301 ;
    time = 1 ;
    auditCount = 2 ;
    auditSize = 80 ;
variables:
    int version ;
        version:long_name = "McIDAS area file version" ;
        int sensorID ;
        sensorID:long_name = "McIDAS sensor number" ;
    int imageDate ;
        imageDate:long_name = "image year and day of year (in ccyyddd
format)" ;
    int imageTime ;
        imageTime:long_name = "image time in UTC (hours/minutes/seconds, in
HHMMSS format)" ;
    int startLine ;
        startLine:long_name = "starting image line (in satellite
coordinates)" ;
    int startElem ;
        startElem:long_name = "starting image element (in satellite
coordinates)" ;
    int time(time) ;
        time:long_name = "seconds since 1970-1-1 0:0:0" ;
        time:units = "seconds since 1970-1-1 0:0:0" ;
    int dataWidth ;
        dataWidth:long_name = "number of 8-bit bytes per source data point"
;
    int lineRes ;
        lineRes:long_name = "resolution of each pixel in line direction" ;
        lineRes:units = "km" ;
    int elemRes ;
        elemRes:long_name = "resolution of each pixel in element direction"
;
        elemRes:units = "km" ;
    int prefixSize ;
        prefixSize:long_name = "line prefix size in 8-bit bytes" ;
    int crDate ;
        crDate:long_name = "image creation year and day of year in ccyyddd
format" ;
    int crTime ;
        crTime:long_name = "image creation time in UTC in hhmmss format" ;
    int bands ;
        bands:long_name = "satellite channel number" ;
    char auditTrail(auditCount, auditSize) ;
        auditTrail:long_name = "audit trail" ;
    float data(time, yc, xc) ;
        data:long_name = "Temperature" ;
        data:type = "VISR" ;
        data:coordinates = "lon lat" ;
        data:units = "K" ;
    float lat(yc, xc) ;
        lat:long_name = "lat" ;
        lat:units = "degrees_north" ;
    float lon(yc, xc) ;
        lon:long_name = "lon" ;
        lon:units = "degrees_east" ;

// global attributes:
        :Conventions = "CF-1.4" ;
        :Source = "McIDAS Area File" ;
        :Satellite\ Sensor = "G-13 IMG    " ;
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