Re: [ferret_users] Getting LAT and LON to be dimensions of a Variable

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

Hi Molulaqhoo,
We have plans to handle data on "curvilienar grid" such as this transparently, using attributes in the dataset. This is not yet implemented. For now you need to do the 3-argument FILL command, with one exception.  Some grids  are defined this way but are in fact rectilinear.  If the latitudes are the same at all values of i in the grid, and the longitudes are the same at all values of j in the grid, then it'd be a matter of defining 1-D coordinate axes; we can help you do that.

The axis that is being marked as a K axis doesn't have attributes that tell Ferret to mark it as a time axis.  Is there a coordinate variable for the dimension of length 120 in the file?  The Unix command ncdump would help us understand what is in the file:

> ncdump -h filename.nc

You could initialize the file in Ferret with the /ORDER=   qualifier:

yes? use/order=xyt  filename.nc

and then if the data should have a formatted  time axis, you could use the DEFINE AXIS command, setting up a T axis of length 120, with the correct units and time origin, then put the data onto that axis with a command like:

yes? let new_sst = sst[gt=time_axis@asn]

-Ansley

On 8/7/2014 3:05 PM, Molulaqhooa Maoyi wrote:

Dear all

I am new into ferret and I have two questions:

I am battling to get the SST data to include LAT and LON dimension instead of them  being separate. I would like to do a fill on the SST data without having to specify LAT and LON e.g fill SST[k=1], LON,LAT

 name     title                                  I              J         K         L         M         N

 LAT      latitude                             1:230     1:194     ...       ...       ...       ...

 LON      longitude                          1:230     1:194     ...       ...       ...       ...

 SST      Sea Surface Temperature  1:230     1:194     1:120     ...       ...       .

 

My second question is how to move a dimension from K to L on the SST variable.

Regards 

Molulaqhooa

--

"Try and Fail than to Fail to Try" - Israel Maoyi