RE: COHERENS sigma to meters z coordinate

["Farrar, Paul D" <FarrarP@xxxxxxxxxxxxx>]

Here is an example of one script I use.


$ cat deplayer.jnl
SET MEMORY/SIZE=$4#25#
set data "$1"
let gr3d = WATER_TEMP[l=$3#1#]
let bb=reshape(GRID_WATER_DEP,gr3d)
let zz=z*bb
let dep=zz[z=@weq:$2#200#]
let ss = WATER_TEMP[l=$3#1#]*dep
shade/levels=(0,35,1)/palette=ocean_temp/title="Water Temp (C) at $2#200#m"
ss[z=@sum]
let wu = water_u[l=$3#1#]*dep
let wv = water_v[l=$3#1#]*dep
vector/ov/length=1/xskip=4/yskip=4 wu[z=@sum],wv[z=@sum]  

$1 is the dataset
$2 is the depth (200m default)
$3 is the time step (1 default)
$4 is memory size (25 default)

You should be able to run it as:

$ ferret
yes? go deplayer
http://pdas.navo.navy.mil/cgi-bin/nph-nc/data/SWAFS/swafs_ame_gme_2003011500
.nc 100 1
(thats all on one line)

You can look at the dataset at
http://pdas.navo.navy.mil/cgi-bin/nph-nc/data/SWAFS/swafs_ame_gme_2003011500
.nc.html

and

http://pdas.navo.navy.mil/

This is from an ocean model that has a sigma vertical coordinate.

If you don't understand the script try executing it line by line and
examining
the data you have at each step.

Paul Farrar

-----Original Message-----
From: Ansley Manke
To: Francisco J Campuzano Guillen
Cc: ferret_users@ferret.wrc.noaa.gov
Sent: 1/16/03 5:07 PM
Subject: Re: COHERENS sigma to meters z coordinate

Hi Francisco,
Welcome to Ferret!  There is a method to replace the Z axis
and convert from sigma coordinates to depth.  There is an
FAQ on this; the example there (using ZAXREPLACE) should
help you, if you have a function that relates the sigma levels to
depth in meters.

http://ferret.pmel.noaa.gov/Ferret/FAQ/data_management/sigma_coordinate_
demo.html

Ansley Manke




Francisco J Campuzano Guillen wrote:

> Hello Ferret users:
>
> This is my first message to the list, I recently started to use this
> software because of the need to represent the NETCDF results from the
> COHERENS (Coupled Hydrodynamical-Ecological Model for Regional and
> Shelf Seas) model.
> At this moment, I'm starting to experiment with the test cases that
> comes included in the CD-ROM, and trying to represent the same
> diagrams as they did in the COHERENS User's Guide(where depths are
> represented in meters),and here is where my doubt comes:
> How can I represent with the FERRET package the vertical coordinate in
> meters instead of sigma-coordinated (I'm using the version 5.41 for
> win32 (so -gui mode is not supported))?.Although I can use the data in
> the default sigma coordinates,the outcomes when I SET DATA are:
>
> *** NOTE: Units on axis "z" are not recognized: sigma_level
> *** NOTE: They will not be convertible
>
> I know it is possibly a quite simple question, but I have been looking
> through the FERRET USERGUIDE and couldn't find the solution, if you
> need any other details please ask.Thank you very much in advance your
> help.Yours sincerely:
>
>                         Francisco Javier Campuzano Guillén
>
> ----------------------------------------
> Francisco J Campuzano Guillén
> Email: G.F.Campuzano@hull.ac.uk
> University of Hull

--
Ansley Manke  Pacific Marine Environmental Laboratory  Seattle WA
(206)526-6246