[Met_help] [rt.rap.ucar.edu #83197] History for conceptual mode question

[John Halley Gotway via RT]

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  Initial Request
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Hi,

I've been using mode for a little while, but recently started using it for
some low resolution data, and realized I had some conceptual questions
about what was happening (since I can now see individual grid boxes).

I've attached a ps output file to better explain my question.

In the observations in the example, there are 3 non-contiguous grid boxes
with precip well above the threshold.  The object, however, is defined on
grid boxes in between the 3 grid boxes with high precip, but not including
the grid boxes with high precip.
Is there a setting that would make it more likely for the object to include
the boxes with high precip?

Thanks in advance for your help!
-Laurel DeHaan


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  Complete Ticket History
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Subject: conceptual mode question
From: John Halley Gotway
Time: Fri Dec 08 15:10:58 2017

Laurel,

I see that you have some questions about MODE.  There are two main
steps in
the object definition process:
  (1) smooth the data based on the convolution radius
  (2) threshold the smoothed data to define the objects

If you're comparing the objects closely to the raw data, I'd suggest
setting the convolution radius to 0.  That effectively bypasses step
number
(1).

Please try rerunning with conv_radius = 0, take a look at the
PostScript
result, and please let me know what other questions you have.

Thanks,
John

On Mon, Dec 4, 2017 at 12:35 PM, Dehaan, Laurel via RT
<met_help at ucar.edu>
wrote:

>
> Mon Dec 04 12:35:17 2017: Request 83197 was acted upon.
> Transaction: Ticket created by ldehaan at ucsd.edu
>        Queue: met_help
>      Subject: conceptual mode question
>        Owner: Nobody
>   Requestors: ldehaan at ucsd.edu
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=83197 >
>
>
> Hi,
>
> I've been using mode for a little while, but recently started using
it for
> some low resolution data, and realized I had some conceptual
questions
> about what was happening (since I can now see individual grid
boxes).
>
> I've attached a ps output file to better explain my question.
>
> In the observations in the example, there are 3 non-contiguous grid
boxes
> with precip well above the threshold.  The object, however, is
defined on
> grid boxes in between the 3 grid boxes with high precip, but not
including
> the grid boxes with high precip.
> Is there a setting that would make it more likely for the object to
include
> the boxes with high precip?
>
> Thanks in advance for your help!
> -Laurel DeHaan
>
>

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