# [ncl-talk] calculation of sst front

Dennis Shea shea at ucar.edu
Fri Nov 15 06:11:58 MST 2019

```A question was just asked yesterday. Please read ncl-talk.

NCL has  several *functions*
<https://www.ncl.ucar.edu/Document/Functions/list_alpha.shtml> for

The spherical harmonic based functions are highly accurate but can only
used with global grids and no missing values.

*https://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff.shtml*
<https://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff.shtml>

*
https://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff_n.shtml
<https://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff_n.shtml>*

===
If you have NCL 6.6.2, you could also use the following with *opt=1*

*https://www.ncl.ucar.edu/Document/Functions/Contributed/shear_stretch_deform.shtml*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/shear_stretch_deform.shtml>
*or*
*https://www.ncl.ucar.edu/Document/Functions/Contributed/shear_stretch_deform_cfd.shtml
<https://www.ncl.ucar.edu/Document/Functions/Contributed/shear_stretch_deform.shtml>*

On Thu, Nov 14, 2019 at 10:15 PM Debashis Paul via ncl-talk <
ncl-talk at ucar.edu> wrote:

> I want to calculate the sst front which is given by:
>  ((dsst/dx)^2 + (dsst/dy)^2)^1/2.
> So is their any function so to calculate derivatives.
>
> DP
> ************************************
> *Debashis Paul*
>
> *Research Scholar,NIT-RKL*
> *Ph:+916002713628*
> *E-mail: Debgeo668 at gmail.com <Debgeo668 at gmail.com>*
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