Re: [idvusers] Displaying AVHRR data in IDV

Hi Mark,

McIDAS-V [which is based on the IDV] is able to read AVHRR Level 1b files using local ADDE servers.There are some caveats:
a) The file must contain all bands.
b) The file from CLASS must contain the entire pass. Do not subset.
c) At this time, McIDAS-V will only read data from the KLM series of NOAA satellites and Metop. This will be updated in the future to use any of the NOAA polar satellites.

If you want more info, let me know.

You can find the software here:

Also, there is a tutorial on the documentation page on "Polar Satellite Imagery".


Dave Santek
University of Wisconsin-Madison
1225 W. Dayton St.
Madison, WI  53706
Phone: 608-263-7410

On 10/19/12 1:27 PM, Yuan Ho wrote:
On 10/17/2012 2:22 PM, Mark Conder wrote:
Hi IDV Users,

I'm having difficulties getting some POES AVHRR data to display in IDV3.1.
I downloaded the files from NOAA's CLASS website, grabbing Global Area
Coverage (GAC) dataset files (extension GC). Then I'm converting them
to netCDF using sat2netcdf, which produces .nc files. Several warning
messages occur during the conversion process such as...

Illegal netCDF-3 attribute name = lat/lon

(I've turned all the header flags on)

Trying to import them into IDV gives me an error "Importing as type
GRID but no grids found"

ncdump on the files produces what looks to be a valid grid file, but
maybe the format is incompatible with IDV, suspected given the
warnings given above.

any ideas?

Mark Conder
National Weather Service Forecast Office
Lubbock, TX

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There are some problems in this netCDF file, such as the unit of lat/lon and missing coordinates attribute on data values, which can be fixed by using ncml file. However, the real problem is using "anchor points" for lat/lon values instead of having a full array, and this will require some kind of interpolation. The conclusion is that the IDV can not read in this file.


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