[Met_help] [rt.rap.ucar.edu #95400] History for the width for regrid_data_plane

[Howard Soh via RT]

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  Initial Request
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To Whom It May Concern:

I have an obs data with a grid resolution of 0.03 degree (or ~3km).  If I
want to use the regrid_data_plane and method of -UW-MEAN to a new grid with
grid spacing of 12km, what is the appropriate value of width? 12/3=4?

The default of regrid-data_plane is method=NEAREST and width=1.  My
variable is the mean values of a grid, thus from fine to coarse grid,
nearest is not a good choice.  From coarse to fine grid, it may be okay.

thank you for your help.

Ho-Chun Huang

IMSG at NOAA/NWS/NCEP/EMC

5830 University Research Ct., Rm. 2792

College Park, MD 20740

Ho-Chun.Huang at noaa.gov <Joe.Smith at noaa.gov>

301-683-3958


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  Complete Ticket History
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Subject: the width for regrid_data_plane
From: Howard Soh
Time: Mon Jun 01 17:34:05 2020

The width and shape (SQUARE or CIRCLE) are used for the regridding.
If width = 5 and shape is SQUARE, 5 by 5 cells (as neighbor data) will
be selected for the interpolation.
- x, y grid index of to_grid
- find x1 and y1 grid index of from_grid as matching grid cell
- collect neighbor data from from_grid (5 by 5 cells: x1-2 to x1+2,
y1-2 to y1+2)
- interpolate

point2grid does not use width and shape.
- x, y grid index for to_grid
- find all points in to_grid(x,y) cell
- Interpolate

Cheers,
Howard

On Fri May 29 09:27:52 2020, ho-chun.huang at noaa.gov wrote:
> To Whom It May Concern:
>
> I have an obs data with a grid resolution of 0.03 degree (or ~3km).
If I
> want to use the regrid_data_plane and method of -UW-MEAN to a new
grid with
> grid spacing of 12km, what is the appropriate value of width?
12/3=4?
>
> The default of regrid-data_plane is method=NEAREST and width=1.  My
> variable is the mean values of a grid, thus from fine to coarse
grid,
> nearest is not a good choice.  From coarse to fine grid, it may be
okay.
>
> thank you for your help.
>
> Ho-Chun Huang
>
> IMSG at NOAA/NWS/NCEP/EMC
>
> 5830 University Research Ct., Rm. 2792
>
> College Park, MD 20740
>
> Ho-Chun.Huang at noaa.gov <Joe.Smith at noaa.gov>
>
> 301-683-3958



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Subject: the width for regrid_data_plane
From: Howard Soh
Time: Tue Oct 13 10:20:19 2020

If you don have any other issue, I would like to close this ticket.

Cheers,
Howard

On Mon Jun 01 17:34:05 2020, hsoh wrote:
> The width and shape (SQUARE or CIRCLE) are used for the regridding.
> If width = 5 and shape is SQUARE, 5 by 5 cells (as neighbor data)
will
> be selected for the interpolation.
> - x, y grid index of to_grid
> - find x1 and y1 grid index of from_grid as matching grid cell
> - collect neighbor data from from_grid (5 by 5 cells: x1-2 to x1+2,
> y1-2 to y1+2)
> - interpolate
>
> point2grid does not use width and shape.
> - x, y grid index for to_grid
> - find all points in to_grid(x,y) cell
> - Interpolate
>
> Cheers,
> Howard
>
> On Fri May 29 09:27:52 2020, ho-chun.huang at noaa.gov wrote:
> > To Whom It May Concern:
> >
> > I have an obs data with a grid resolution of 0.03 degree (or
~3km).
> > If I
> > want to use the regrid_data_plane and method of -UW-MEAN to a new
> > grid with
> > grid spacing of 12km, what is the appropriate value of width?
12/3=4?
> >
> > The default of regrid-data_plane is method=NEAREST and width=1.
My
> > variable is the mean values of a grid, thus from fine to coarse
grid,
> > nearest is not a good choice.  From coarse to fine grid, it may be
> > okay.
> >
> > thank you for your help.
> >
> > Ho-Chun Huang
> >
> > IMSG at NOAA/NWS/NCEP/EMC
> >
> > 5830 University Research Ct., Rm. 2792
> >
> > College Park, MD 20740
> >
> > Ho-Chun.Huang at noaa.gov <Joe.Smith at noaa.gov>
> >
> > 301-683-3958



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Subject: the width for regrid_data_plane
From: Ho-Chun Huang - NOAA Affiliate
Time: Tue Oct 13 11:08:12 2020

Hi,

Please close the ticket.

Ho-Chun Huang

IMSG at NOAA/NWS/NCEP/EMC

5830 University Research Ct., Rm. 2792

College Park, MD 20740

Ho-Chun.Huang at noaa.gov <Joe.Smith at noaa.gov>

301-683-3958


On Tue, Oct 13, 2020 at 12:20 PM Howard Soh via RT <met_help at ucar.edu>
wrote:

> If you don have any other issue, I would like to close this ticket.
>
> Cheers,
> Howard
>
> On Mon Jun 01 17:34:05 2020, hsoh wrote:
> > The width and shape (SQUARE or CIRCLE) are used for the
regridding.
> > If width = 5 and shape is SQUARE, 5 by 5 cells (as neighbor data)
will
> > be selected for the interpolation.
> > - x, y grid index of to_grid
> > - find x1 and y1 grid index of from_grid as matching grid cell
> > - collect neighbor data from from_grid (5 by 5 cells: x1-2 to
x1+2,
> > y1-2 to y1+2)
> > - interpolate
> >
> > point2grid does not use width and shape.
> > - x, y grid index for to_grid
> > - find all points in to_grid(x,y) cell
> > - Interpolate
> >
> > Cheers,
> > Howard
> >
> > On Fri May 29 09:27:52 2020, ho-chun.huang at noaa.gov wrote:
> > > To Whom It May Concern:
> > >
> > > I have an obs data with a grid resolution of 0.03 degree (or
~3km).
> > > If I
> > > want to use the regrid_data_plane and method of -UW-MEAN to a
new
> > > grid with
> > > grid spacing of 12km, what is the appropriate value of width?
12/3=4?
> > >
> > > The default of regrid-data_plane is method=NEAREST and width=1.
My
> > > variable is the mean values of a grid, thus from fine to coarse
grid,
> > > nearest is not a good choice.  From coarse to fine grid, it may
be
> > > okay.
> > >
> > > thank you for your help.
> > >
> > > Ho-Chun Huang
> > >
> > > IMSG at NOAA/NWS/NCEP/EMC
> > >
> > > 5830 University Research Ct., Rm. 2792
> > >
> > > College Park, MD 20740
> > >
> > > Ho-Chun.Huang at noaa.gov <Joe.Smith at noaa.gov>
> > >
> > > 301-683-3958
>
>
>
>

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