[ncl-talk] linint2_point

[Kwesi A. Quagraine]

Dear Ehsan,

Follow from Ian’s explanation; as an example, lower resolution grids have
less spatial variance than higher resolution grids and interpolating the
lower resolution to a higher resolution does not change this. Thus taking a
lower resolution grid to a higher resolution grid does not add information.
The interpolated data will have low spatial and temporal variance.
That is why more commonly higher resolution grids would be interpolated to
lower resolution.

This information has to be explicitly stated in your paper; because there
are some analysis that are sensitive to interpolation and readers have to
bear that in mind when comparing results.

Hope this helps.

Regards
Kwesi

On 17 July 2020 at 18:48:39, Ian Harris (ENV - Staff) via ncl-talk (
ncl-talk at mailman.ucar.edu) wrote:

Hi,

I'd say they want you to examine the resolution of your input and output
data, in case the interpolation could be judged, er, 'optimistic'. For
instance, if I had data on a 5° grid, I could easily interpolate it onto a
0.5° grid, but there are implications because you're not inventing new
data, you're still stuck with the 5° data but on a finer grid.

Cheers

Harry
------------------------------
*From:* ncl-talk <ncl-talk-bounces at mailman.ucar.edu> on behalf of Ehsan
Taghizadeh via ncl-talk <ncl-talk at mailman.ucar.edu>
*Sent:* 17 July 2020 17:12
*To:* Ncl-talk <ncl-talk at ucar.edu>
*Subject:* [ncl-talk] linint2_point


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Dear NCL group,
I hope you're doing great.
I have a general question and I hope I could have your help, as usual.
In one paper I wrote "The interpolation was done using the bilinear method
in NCL (NCAR Command Language)". Actually, I interpolated some grid
precipitation products on gauged stations using "linint2_points" from NCL.
The referee commented "With how many points? Please discuss also the
spatial scale resolution differences in products and interpolation
implications."
I wanna reply "As mentioned in the paper, we used NCL in the most
programming. NCL has a function named linint2_points which interpolates
from a rectilinear grid to an unstructured grid using bilinear
interpolation based on the four closest grid points to a particular (x, y)
coordinate pair." However, I don't know how reply to the part of discussing
about different spatial resolution. May I ask some help about that, please?

*Sincerely,*
*Ehsan Taghizadeh*
*PhD student of Meteorology,*
*Institute of Geophysics, University of Tehran, Iran*
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*Try not to become a man of success but rather a man of value - Albert
Einstein*

Kwesi A. Quagraine
Department of Physics
School of Physical Sciences
College of Agriculture and Natural Sciences
University of Cape Coast
Cape Coast, Ghana

Alt. Email: kwesi at csag.uct.ac.za
Web: http://www.recycleupghana.org/
Office: +27 21 650 1563
Skype: quagraine_cwasi
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