[ncl-talk] Grid Interpolation (Conservative?)

[Beáta Szabó-Takács]

Dear Barry,
The description of remapgrid according to CDO documentation is:

This module contains operators for a first order conservative remapping of fields between grids in spherical coordinates. The operators in this module uses code from the YAC software package to compute the conservative remapping weights. For a detailed description of the interpolation method see [SCRIP] (https://github.com/SCRIP-Project/SCRIP/blob/master/SCRIP/doc/SCRIPusers.pdf). The interpolation method is completely general and can be used for any grid on a sphere. The search algorithm for the conservative remapping requires that no grid cell occurs more than once.

According to my experience it needs grid corners. I do not know if it works with point data.
Best wishes,
Beata
________________________________
From: Barry Lynn <barry.h.lynn at gmail.com>
Sent: Friday, August 30, 2019 5:50 PM
To: Beáta Szabó-Takács <szabo.b at czechglobe.cz>
Cc: ncl-talk <ncl-talk at ucar.edu>
Subject: Re: [ncl-talk] Grid Interpolation (Conservative?)

Hi Beata:

Thank you.  What does CDO stand for?

I was just thinking it over, and I am not sure if point data can be conservantly transformed because it is just point, rather than gridded data.

Barry

On Fri, Aug 30, 2019 at 6:04 PM Beáta Szabó-Takács <szabo.b at czechglobe.cz<mailto:szabo.b at czechglobe.cz>> wrote:
Dear Barry,
I do not know if obj_anal_ic is conservative but the remapcon operator in CDO is conservative interpolation.
I hope I could help you!
Best regards,
Beata
________________________________
From: ncl-talk <ncl-talk-bounces at ucar.edu<mailto:ncl-talk-bounces at ucar.edu>> on behalf of Barry Lynn via ncl-talk <ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu>>
Sent: Friday, August 30, 2019 1:44 PM
To: ncl-talk <ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu>>
Subject: [ncl-talk] Grid Interpolation (Conservative?)

Hello:

I am using obj_anal_ic to interpolate data (lat/lon/value) to a coarser grid.

I am wondering if the interpolation is conservative (the grid is a mercator grid).

If not, is there a recommendation on which interpolation scheme to use?

Thank you.

Barry

--
Barry H. Lynn, Ph.D
Senior Associate Scientist, Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525



--
Barry H. Lynn, Ph.D
Senior Associate Scientist, Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20190830/fdc7e638/attachment.html>