Re: help with variable coordinates

From: Adam Phillips (asphilli AT cgd.ucar.edu)
Date: Thu Oct 28 2004 - 09:05:54 MDT

  • Next message: Marjolaine Krug: "RE: [ncl-talk] help with variable coordinates"

    Marjolaine,

    For this plotting function, the data array has to be dimensioned lat x lon, so
    you need to reorder the array:

    plot = gsn_csm_contour_map_ce(wks,SSH(lat|:,lon|:),res) ; contour the variable

    Also, make sure you are setting res@gsnAddCyclic = False, since your data does
    not span 360 degrees longitude. (This didn't cause the error messages though...)

    Adam

    >Delivered-To: asphilli@ucar.edu
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    >From: "Marjolaine Krug" <marjolaine@absamail.co.za>
    >To: <ncl-talk@ucar.edu>
    >Date: Wed, 27 Oct 2004 18:52:54 +0200
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    >Subject: help with variable coordinates
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    >
    >Hi,
    >
    >I am trying to display some sea surface height data. After reading the
    >netcdf file and selecting
    >my domain of interest (between 5E-37E and 10S-45S), I created a variable
    >named SSH with the following characteristics:
    >
    >Variable: SSH
    >Type: double
    >Total Size: 94672 bytes
    > 11834 values
    >Number of Dimensions: 2
    >Dimensions and sizes: [lon | 97] x [lat | 122]
    >Coordinates:
    > lon: [4.999999999981497..36.9999999999
    > lat: [-44.94717361016565..-10.03921300
    >Number Of Attributes: 3
    > units : cm
    > long_name : Sea Surface Height
    > _FillValue : -999
    >(0,0) 154.9432401657104
    >(0,1) 156.5235819816589
    >(0,2) 157.7931829690933
    >(0,3) 158.2195770740509
    >(0,4) 158.3596502542496
    >(0,5) 159.1470654010773
    >(0,6) 160.468214392662
    >
    >After setting the plot resources, I try to visualise my variable SSH with
    >the command
    >plot = gsn_csm_contour_map_ce(wks,SSH,res) ; contour the variable
    >
    >and get prompted with the following 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) Valid latitude names include:
    >(0) 'lat' 'Lat' 'Latitude' 'LAT' 'latitude' 'LATITUDE' 'hlat'
    >'lat_u' 'lat_t' 'lat_98' 'lat1' 'lat2' 'yc'
    >(0) check_for_lon_coord: Warning: Data either does not contain a valid
    >longitude coordinate array or doesn't contain one at all.
    >(0) Valid longitude names include:
    >(0) 'lon' 'Lon' 'Longitude' 'LON' 'longitude' 'LONGITUDE' 'hlon'
    >'long' 'lon_u' 'lon_t' 'lon_98' 'lon1' 'lon2' 'xc'
    >
    >I do not understand what went wrong. Can someone help?
    >
    >
    >

    -------------------------------------------------------------
    Adam Phillips email: asphilli@ucar.edu
    Climate and Global Dynamics Division tel: (303) 497-1726
    National Center for Atmospheric Research fax: (303) 497-1333
    P.O. Box 3000
    Boulder, CO 80307-3000 http://www.cgd.ucar.edu/~asphilli

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