Re: [Opengrads-devel] LATS ported to GrADS v2 as an extension

[Jennifer A. <jm...@co...>]

Hi, Arlindo --
I am not planning on a new release in the near future. After the  
initial hiccup, version 2.0.a7.1 has not been particularly buggy. Our  
next release will have some new features that are still under  
development. At the moment, we're working on the shapefile interface.
--Jennifer

On Oct 15, 2009, at 10:48 AM, Arlindo da Silva wrote:

> All,
>
>
>  With Mike's help I've been able to port the LATS interface as an  
> extension to GrADS v2.0.a7.oga.2. I used the opportunity do make a  
> few enhancements such as support for NetCDF-3, NetCDF-4/HDF-5 and  
> HDF-4 all from the same single executable, and support for NetCDF-4  
> compression. The UI has simplified a bit, you no longer need to go  
> through the "display" command. The following UDCs are provided:
>
>      User
>   Defined
>   COMMAND           Short Description                Function@Library
>  ---------- -----------------------------------   
> --------------------------
>  set_lats   Set LATS parameters                   
> c_lats_set@^liblats.gex
>  query_lats Query LATS parameters                 
> c_lats_query@^liblats.gex
>  lats_grid  Define LATS grid                      
> c_lats_grid@^liblats.gex
>  lats_data  Write data to LATS file               
> c_lats_data@^liblats.gex
>  ---------- -----------------------------------   
> --------------------------
>
> The lats4d.gs usage remains the same; it detects the version and use  
> the appropriate LATS command. Some additional information:
>
> 1) I fixed a bug which has been driving me crazy for almost 10  
> years: now you can call it twice in a row without exiting grads.
>
> 2) I created an alias for the "convention" parameter called  
> "format". These are equivalent
>
>     ga-> set_lats convention grib
>     ga-> set_lats format grib
>
> 3) From the same single executable added several format options
>
>     ga-> set_lats format netcdf    (same as coards which is now  
> deprecated)
>     ga-> set_lats format netcdf4  (this is actually hdf-5)
>     ga-> set_lats format hdf4
>
> 4) Added a compression option with NetCDF
>
>     ga-> set gzip 2       (the higher the number, the better the  
> compression)
>     ga-> set shave 12  (number of bits to shave from float mantissa)
>
>     These usually go hand and hand. If you set shave it will  
> automatically set gzip=2 if it has not been set already. I should be  
> able to add this feature to HDF-4 output as well, but this require a  
> patch I got from the HDF Group and I'd better leave the supplibs  
> alone for now.
>
> 5) Made lats4d.gs aware of these new features. Try these:
>
> % lats4d.sh -i model -o junk -format netcdf -v
> % lats4d.sh -i model -o junk -format netcdf4 -v
> % lats4d.sh -i model -o junk -format hdf4 -v
> % lats4d.sh -i model -o junk2 -format netcdf -shave -v
>
> Compare the file sizes. Notice that the file extensions are now  
> consistent with the file format. Mike is looking into adding GRIB-2  
> support so that we can close the circle: conversion from/to any  
> GrADS supported format.
>
> I still have some work to do on documentation and create a  
> comprehensive test suite (I might be able to borrow from my GrADS  
> v1.x test suite.) If anybody out there would like to help test this,  
> just check out from CVS:
>
> % gacvs co -P Grads
> % cd Grads
> % make binstall
>
> The lats4d.sh script is now included under opengrads/Contents and  
> all should work out of the box. I am not sure if I'll release this  
> as v2.0.a7.oga.3 or wait for 2.0.a8.
>
> Jennifer: Is 2.0.a8 coming out any time soon?
>
>   Cheers!
>
>       Arlindo
>
>
>
>
>
>
>
>
> -- 
> Arlindo da Silva
> da...@al...
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jm...@co...