Date: Sat Nov 02 2013 - 16:30:14 MDT
Sam
NCL only recognises a few finite strings for the latitude coord arrays 'long_name' and 'units' attributes; valid values are listed in the error messages which you copied into your email.
You should be able to easily fix the problem by changing these attributes before plotting, thus:
latitude@long_name = "latitude"
latitude@units = "degrees_north"
Will
From: "Sam McClatchie (NOAA Federal)" <sam.mcclatchie@noaa.gov<mailto:sam.mcclatchie@noaa.gov>>
Reply-To: "sam.mcclatchie@noaa.gov<mailto:sam.mcclatchie@noaa.gov>" <sam.mcclatchie@noaa.gov<mailto:sam.mcclatchie@noaa.gov>>
Date: Sunday, 3 November 2013 8:59 AM
To: NCL maillist <ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>>
Subject: non conventional missing value type problem/ 2
I am working with a netcdf of global drifter data <
http://www.aoml.noaa.gov/phod/dac/dac_meanvel.php>
that appears to have a non-conventional missing value.
Changing
setfileoption ("nc", "/MissingToFillValue/", False) ; turn off
to
setfileoption ("nc", "MissingToFillValue", False) ; turn off
allowed me to run my code and turn up the fact that the coordinate units for the netcdf file are also non-conventional.
Error returned on run:
Variable: Latitude
Type: double
Total Size: 2536 bytes
317 values
Number of Dimensions: 1
Dimensions and sizes: [Lat | 317]
Coordinates:
Lat: [ -73.. 85]
Number Of Attributes: 4
long_name : Latitude (negative = south)
units : degrees
valid_min : -73
valid_max : 85
(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'
It looks like I need to reassign the coordinate variable units as well as the missing value, and write them to the file. No need to reply if this is a correct solution.
Thanks and Best Fishes
Sam
-- Sam McClatchie, Supervisory oceanographer, Fisheries oceanography Southwest Fisheries Science Center, NOAA, 8901 La Jolla Shores Dr. La Jolla, CA 92037-1509, U.S.A. Office: 858 546 7083, Cellular: 858 752 8495 Research home page<http://www.fishocean.info> [cid:part3.05090203.05030709@noaa.gov]
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