Re: [ferret_users] Reading ADCP data

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi Luiz,
I see nobody has answered you yet.  The ZAXREPLACE functions are meant 
to handle this kind of problem. You define a depth axis and use pressure 
to do a kind of regridding of your data to the Z axis. It's documented, 
with examples here,

http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/variables-xpressions/XPRESSIONS#_VPINDEXENTRY_338

and there are several versions of the function which use different 
methods for converting to the new Z axis.  The one you want might be 
ZAXREPLACE_BIN

http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/appendix-a-external-functions/ZAXREPLACE-BIN


Ansley

Luiz Alexandre de Araujo Guerra wrote:
> Dear colleagues,
>
> I'm working on a adcp time series. I've read it from an ascii file and Ferret
> shows:
>
>
> --yes? sh da
>      currently SET data sets:
>     1> ./FBC_4_0100.nc  (default)
>  name     title                             I         J         K         L
>  PRESSURE pressure                         ...       ...       ...       1:5476
>  VEL      velocity                         ...       ...       1:45      1:5476
>  DIR      direction                        ...       ...       1:45      1:5476
>  U        zonal velocity                   ...       ...       1:45      1:5476
>  V        meridional velocity              ...       ...       1:45      1:5476
>  W        vertical velocity                ...       ...       1:45      1:5476
>
>
> The adcp was installed at the upper end of a mooring line at 150 m depth and
> the line stretched with time more than 40 m. I would like to correct the bin
> depths using pressure data. The pressure data is not monotonic. I was
> wondering if I should make a grid TIME x Z and use some transform to populate
> the matrix with current data at the corrected depth levels. How can I do it?
> Or does anybody have a better idea?
>
> Regards,
>  
> Luiz Alexandre Guerra
> Aluno de Doutorado / Graduate Student
>
> Universidade Federal do Rio de Janeiro / Rio de Janeiro Federal University
> COPPE/PEnO / Ocean Engineering Program
>
>