Re: NCL operationally

Thanks! I needed that demo .ncl file. I've had some problems with NCL
creation of png and this helps solve a problem. I'm a proponent fo
these, too.

gerry

Dave Allured wrote:
> You might consider using the "experimental" PNG driver to make PNG files
> directly from NCL:
>
> http://www.ncl.ucar.edu/FAQ/#o_formats_003
>
> I made some hi-rez PNG plots over a North America subset. The quality
> seems better than with convert. You can check out some demo plots and
> the script here:
>
> http://www.cdc.noaa.gov/people/dave.allured/data/ncl/png/
>
> The only drawback so far is that the PNG driver is slow. For a 3000 x
> 3000 pixel PNG, and grid size 321 x 161, the run time increased by about
> 50 seconds.
>
> Dave Allured
> CU/CIRES Climate Diagnostics Center (CDC)
> http://cires.colorado.edu/science/centers/cdc/
> NOAA/ESRL/PSD, Climate Analysis Branch (CAB)
> http://www.cdc.noaa.gov/
>
> Oliver.Fuhrer_at_meteoswiss.ch wrote:
>> Hi all,
>>
>> We are currently benchmarking NCL against MetView (from ECMWF). The
>> goal would be to use NCL operationally to produce plots of our model
>> output. Most of these products are produced in time-critical mode.
>>
>> Currently, there seem to be two bottlenecks that are slowing NCL down
>> considerably as compared to MetView. The first is the reading of our
>> model output in grib1 format. After offline conversion using
>> ncl_convert2nc to NetCDF format and execution of the same script
>> simply reading a couple of fields from a couple of files, the script
>> runs 10x faster. The second is the generation of raster graphics using
>> NCL. A lot of our plots are disseminated in PNG or GIF format. MetView
>> can directly write these formats whereas NCL writes a PS or PDF and
>> the raster format is produced using the "convert" utility.
>>
>> 1) I would be very much interested in future plans for NCL concerning
>> these two points.
>>
>> 2) Would a generation of NCGM and conversion using ctrans to a raster
>> format bring any gain in performance?
>>
>> Thanks and kind regards,
>> Oliver
>> ________________________________________
>> Oliver Fuhrer
>> Numerical Models
>>
>> Federal Departement of Home Affairs FDHA
>> Federal Office of Meteorology and Climatology MeteoSwiss
>>
>> Kraehbuehlstrasse 58, P.O. Box 514, CH-8044 Zurich, Switzerland
>>
>> Tel. +41 44 256 93 59
>> Fax +41 44 256 92 78
>> oliver.fuhrer_at_meteoswiss.ch
>> www.meteoswiss.ch - First-hand information
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Received on Tue Jan 20 2009 - 10:21:38 MST