Re: mass-conservative regridding

Hi Dennis,

Thank you very much for the reply.
But I am sorry I didn't quite get it.
I mean I have a global emission data map. No matter the resolution is, the
total emission should be the same, right?
I am trying to regrid 1x1 degree fixed grid to 1.9x2.5 degree fixed grid.
The total emission of 1x1 is about 70,000, but either using ESMF or area
conservative remap, the total emission of 1.9x2.5 is no larger than 20,000.
I guess it is because 99% grid points of my emission map are 0, the
difference of average is not large.

I found in ncl-talk that we can re-scale the regridded to map to match the
original total emission, 70000. But it was an old message. So, right now,
ESMF is the best we have, right?

Thank you for your time and patience!

Best,
Wenshan
------------------------------------------------------------------------------
Graduate Student Researcher
Earth System Science
University of California, Irvine

On Sat, Feb 15, 2014 at 9:36 AM, Dennis Shea <shea@ucar.edu> wrote:

> ESMF is as 'state of the art' as it gets.
>
> re: "The avg is good enough but the sum of all grids is quite off."
>
> This is rather obscure. The "sum of all grids" means nothing.
> If you had 100 grid points an the other grid had 1000, the
> sums would be different.
>
>
>
>
>
> On 2/13/14, 2:03 PM, Wenshan Wang wrote:
>
>> Hi all,
>>
>> I am now trying to regrid emission data, which asks for mass-conservative.
>> I found a message talking about emission regridding about 6 years ago.
>>
>> I was wondering whether NCL has some new functions that can perform a
>> mass-conservative regrid since then.
>>
>> I tried 'area_conserve_remap', 'area_hi2lores' and ESMF conservative
>> method.
>> The avg is good enough but the sum of all grids is quite off.
>>
>> Thank you!
>>
>> Best,
>> Wenshan
>> ------------------------------------------------------------
>> ------------------
>> Graduate Student Researcher
>> Earth System Science
>> University of California, Irvine
>>
>>
>>
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Received on Mon Feb 17 13:49:41 2014