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Re: [Fwd: Re: Fwd: netCDF and IDV for the Deepwater Horizon]

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  • Subject: Re: [Fwd: Re: Fwd: netCDF and IDV for the Deepwater Horizon]
  • Date: Tue, 25 May 2010 17:40:32 -0600
On 5/25/2010 5:26 PM, Ansley Manke wrote:
Hi John,
Actually the way the data is organized, LON and LAT are not coordinate axes but dependent variables, so wouldn't it be

<?xml version="1.0" encoding="UTF-8"?>
<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2" location="E:/work/deepwater/drifter_example.nc">
<attribute name="Conventions" value="CF-1.5" />
<attribute name="CF:featureType" value="trajectory" />
<variable name="LON">
<attribute name="units" value="degrees_east" />
<attribute name="coordinates" value="TAXIS" />
</variable>
<variable name="LAT">
<attribute name="units" value="degrees_north" />
<attribute name="coordinates" value="TAXIS" />
</variable>
<variable name="SST">
<attribute name="coordinates" value="TAXIS" />
</variable>
<variable name="SPEED">
<attribute name="coordinates" value="TAXIS" />
</variable>
<variable name="DIR">
<attribute name="coordinates" value="TAXIS" />
</variable>
</netcdf>


You could say that the fact that they are "dependent variables" is expressed by the dimensionality LAT(TAXIS), LON(TAXIS), rather than LAT(LAT), LON(LON).

anyway, coordinates here means the georefrenceing coordinates and you do need them in that attribute.