ncl赋值变量经纬信息不识别，望指点迷津

happymgj

begin
temper=asciiread("F:/Matlab/zidongzhan/2017080818.000", (/301,301/),"float")

temper!0="lon"
lon=fspan(116,119,301)
lon@long_name="longitude"
lon@units="degrees_east"
temper&lon=lon
printVarSummary(temper&lon)

temper!1="lat"
lat=fspan(38,41,301)
lat@long_name="latitude"
lat@units="degrees_north"
temper&lat=lat
printVarSummary(temper&lat)

wks=gsn_open_wks("png","F:/Matlab/zidongzhan/2017080818")

res =True

plot=gsn_csm_contour_map(wks,temper,res)
end

错误提示：
$ ncl F:/Matlab/zidongzhan/test.ncl
Copyright (C) 1995-2017 - All Rights Reserved
University Corporation for Atmospheric Research
NCAR Command Language Version 6.4.0
The use of this software is governed by a License Agreement.
See http://www.ncl.ucar.edu/ for more details.

Variable: lon (coordinate)
Type: float
Total Size: 1204 bytes
            301 values
Number of Dimensions: 1
Dimensions and sizes:   [lon | 301]
Coordinates:
Number Of Attributes: 2
  long_name :   longitude
  units :       degrees_east

Variable: lat (coordinate)
Type: float
Total Size: 1204 bytes
            301 values
Number of Dimensions: 1
Dimensions and sizes:   [lat | 301]
Coordinates:
Number Of Attributes: 2
  long_name :   latitude
  units :       degrees_north
(0)     check_for_y_lat_coord: Warning: Data either does not contain
(0)     a valid latitude coordinate array or doesn't contain one at all.
(0)     A valid latitude coordinate array should have a 'units'
(0)     attribute equal to one of the following values:
(0)         'degrees_north' 'degrees-north' 'degree_north' 'degrees north' 'degr                                     ees_N' 'Degrees_north' 'degree_N' 'degreeN' 'degreesN' 'deg north'
(0)     check_for_lon_coord: Warning: Data either does not contain
(0)     a valid longitude coordinate array or doesn't contain one at all.
(0)     A valid longitude coordinate array should have a 'units'
(0)     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'