Re: few data points in map

From: Fan Fang <Fan.Fang_at_nyahnyahspammersnyahnyah>
Date: Tue Jul 31 2012 - 10:33:29 MDT

Hi Mary,

The error message is

fatal:A minimum of 3 coordinates points must be provided to
CreateSplineApprox
fatal:A minimum of 3 coordinates points must be provided to
CreateSplineApprox

The CDL attached below. The error is gone when we increase the grid
points to 3x3.

netcdf testmap.nc {
dimensions:
         time = 1 ;
     latitude = 2 ;
     longitude = 2 ;

variables:
         float latitude(latitude) ;
               latitude:units = "degrees_north" ;
           latitude:standard_name = "Latitude" ;
         float longitude(longitude) ;
               longitude:units = "degrees_east" ;
           longitude:standard_name = "Longitude" ;
     float Water_Vapor_Near_Infrared(time, latitude, longitude) ;
         Water_Vapor_Near_Infrared:long_name = "Total Column
Precipitable Water Vapor - Near IR" ;
         Water_Vapor_Near_Infrared:units = "cm" ;
         Water_Vapor_Near_Infrared:quantity_type = "water Vapor" ;

// global attributes:
         :DESCRIPTION = "Projected image" ;
         :BOUNDINGBOX = -15.f, 25.f, -6.f, 43.f ;
         :BBOX_SEQUENCE = "lat0,lon0,lat1,lon1" ;
         :LOWER_LEFT = "lat0,lon0" ;
         :UPPER_RIGHT = "lat1,lon1" ;

data:

  latitude = -15.0, -14.0 ;
  longitude = 25.0, 27.0 ;
  Water_Vapor_Near_Infrared = -9 , -99 , -99 , -9 ;
}

On 07/31/2012 10:23 AM, Mary Haley wrote:
> Dear Fan,
>
> Can you can provide a short example that illustrates the problem? Also, what is the error that you get?
>
> I was able to get a plot with 2 x 2 points, although I did get some errors:
>
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>
> data = (/ (/1,2/), (/3,4/) /)
> data!0 = "lat"
> data!1 = "lon"
> data&lat = (/-10,10/)
> data&lon = (/-20,20/)
> data&lat@units = "degrees_north"
> data&lon@units = "degrees_east"
>
> wks = gsn_open_wks("x11","test")
> res = True
> res@mpMinLatF = min(data&lat)
> res@mpMaxLatF = max(data&lat)
> res@mpMinLonF = min(data&lon)
> res@mpMaxLonF = max(data&lon)
> res@gsnAddCyclic = False
> plot = gsn_csm_contour_map_ce(wks,data,res)
>
> --Mary
>
>
> On Jul 31, 2012, at 7:54 AM, Fan Fang wrote:
>
>> Would gsn_csm_contour_map_ce() plot for few data points? It seems to
>> complain without plotting when we feed less than 3x3 contiguous points.
>> Also any limit for scattered points?
>>
>> Thanks.
>>
>> -Fan
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Received on Tue Jul 31 10:33:56 2012

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