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```Hi, all
I meet a strange problem,when I use the contour procedure to generate
precipitation contour plot,the total AWS stations is about 24, just
one has rainfall at 0.6mm,others are zero.
so I use this data and a contour plot can be created(around this
station with 0.6mm rainfall, there is few station)

but if the total stations is about 150, and the same situation that
ony this station has 0.6mm rainfall, there will be no contour plot,
which means the whole map will be the same colors presenting zero. the
distribution of stations' location is not even, some places are many
stations ,some are not. but around this station with 0.6mm rainfall
there are many stations.

by the way, my color table scale is like '0,0.2,1,2,...'
so anyone can tell me what happen?

```
 0
Reply wfzhao (11) 3/21/2008 2:36:08 PM

See related articles to this posting

```On 3=D4=C221=C8=D5, =CF=C2=CE=E710=CA=B136=B7=D6, wfz...@bjmb.gov.cn wrote:
> Hi, all
> I meet a strange problem,when I use the contour procedure to generate
> precipitation contour plot,the total AWS stations is about 24, just
> one has rainfall at 0.6mm,others are zero.
> so I use this data and a contour plot can be created(around this
> station with 0.6mm rainfall, there is few station)
>
> but if the total stations is about 150, and the same situation that
> ony this station has 0.6mm rainfall, there will be no contour plot,
> which means the whole map will be the same colors presenting zero. the
> distribution of stations' location is not even, some places are many
> stations ,some are not. but around this station with 0.6mm rainfall
> there are many stations.
>
> by the way, my color table scale is like '0,0.2,1,2,...'
> so anyone can tell me what happen?

Hi,all

I know what happen, when I use the procedure'griddata', the keyword
'smoothing' is 0.05 (I specify it),so the contour plot is nothing,when
I change it to 0.01,the contour plot is correct.
then I check the help information about smoothing, just few
information

so I want to know , in the griddata procedure, for the Inverse
Distance method, how to specify the smoothing keyword correctly?

thanks
wenfang
```
 0
Reply wfzhao (11) 3/22/2008 4:30:00 AM

```On Mar 22, 12:30 am, wfz...@bjmb.gov.cn wrote:
> On 3=D4=C221=C8=D5, =CF=C2=CE=E710=CA=B136=B7=D6, wfz...@bjmb.gov.cn wrote=
:
>
>
>
> > Hi, all
> > I meet a strange problem,when I use the contour procedure to generate
> > precipitation contour plot,the total AWS stations is about 24, just
> > one has rainfall at 0.6mm,others are zero.
> > so I use this data and a contour plot can be created(around this
> > station with 0.6mm rainfall, there is few station)
>
> > but if the total stations is about 150, and the same situation that
> > ony this station has 0.6mm rainfall, there will be no contour plot,
> > which means the whole map will be the same colors presenting zero. the
> > distribution of stations' location is not even, some places are many
> > stations ,some are not. but around this station with 0.6mm rainfall
> > there are many stations.
>
> > by the way, my color table scale is like '0,0.2,1,2,...'
> > so anyone can tell me what happen?
>
> Hi,all
>
> I know what happen, when I use the procedure'griddata', the keyword
> 'smoothing' is 0.05 (I specify it),so the contour plot is nothing,when
> I change it to 0.01,the contour plot is correct.
> then I check the help information about smoothing, just few
> information
>
> so I want to know , in the griddata procedure, for the Inverse
> Distance method, how to specify the smoothing keyword correctly?
>
> thanks
> wenfang

Hi Wenfang,

I think you are not getting a response from the group (which is very
responsive) because of the way you have framed your question.  There
isn't anything easy to framing a question well - it takes a lot of
time - and sometimes the solution appears even as you compose the
question!  YeeHa!

I happened to have questions about GridData a short while ago (see
http://tinyurl.com/2w5d2h) , and I got many productive responses. I
think I got good responses because I made it as easy as I could on the
newsgroup readers to help - an short reproducible example, a
description of how I knew the results were "wrong", etc.

Anyway, the short of it is I would love to help, but I can't penetrate
the issue because you have unveiled the problem in a way I can
understand.

The one thing I can say is that I agree, the documentation for the
SMOOTH keyword to GridData is not helpful.  There doesn't seem to be
any reference cited for this method, but this might be a good start...

http://en.wikipedia.org/wiki/Inverse_distance_weighting

Cheers,
Ben
```
 0
Reply ben.bighair (173) 3/23/2008 8:35:04 PM

```On 3=D4=C224=C8=D5, =C9=CF=CE=E74=CA=B135=B7=D6, "ben.bighair" <ben.bigh...@=
gmail.com> wrote:
> On Mar 22, 12:30 am, wfz...@bjmb.gov.cn wrote:
>
>
>
>
>
> > On 3=D4=C221=C8=D5, =CF=C2=CE=E710=CA=B136=B7=D6, wfz...@bjmb.gov.cn wro=
te:
>
> > > Hi, all
> > > I meet a strange problem,when I use the contour procedure to generate
> > > precipitation contour plot,the total AWS stations is about 24, just
> > > one has rainfall at 0.6mm,others are zero.
> > > so I use this data and a contour plot can be created(around this
> > > station with 0.6mm rainfall, there is few station)
>
> > > but if the total stations is about 150, and the same situation that
> > > ony this station has 0.6mm rainfall, there will be no contour plot,
> > > which means the whole map will be the same colors presenting zero. the=

> > > distribution of stations' location is not even, some places are many
> > > stations ,some are not. but around this station with 0.6mm rainfall
> > > there are many stations.
>
> > > by the way, my color table scale is like '0,0.2,1,2,...'
> > > so anyone can tell me what happen?
>
> > Hi,all
>
> > I know what happen, when I use the procedure'griddata', the keyword
> > 'smoothing' is 0.05 (I specify it),so the contour plot is nothing,when
> > I change it to 0.01,the contour plot is correct.
> > then I check the help information about smoothing, just few
> > information
>
> > so I want to know , in the griddata procedure, for the Inverse
> > Distance method, how to specify the smoothing keyword correctly?
>
> > thanks
> > wenfang
>
> Hi Wenfang,
>
> I think you are not getting a response from the group (which is very
> responsive) because of the way you have framed your question.  There
> isn't anything easy to framing a question well - it takes a lot of
> time - and sometimes the solution appears even as you compose the
> question!  YeeHa!
>
> I happened to have questions about GridData a short while ago (seehttp://t=
inyurl.com/2w5d2h) , and I got many productive responses. I
> think I got good responses because I made it as easy as I could on the
> newsgroup readers to help - an short reproducible example, a
> description of how I knew the results were "wrong", etc.
>
> Anyway, the short of it is I would love to help, but I can't penetrate
> the issue because you have unveiled the problem in a way I can
> understand.
>
> The one thing I can say is that I agree, the documentation for the
> SMOOTH keyword to GridData is not helpful.  There doesn't seem to be
> any reference cited for this method, but this might be a good start...
>
> http://en.wikipedia.org/wiki/Inverse_distance_weighting
>
> Cheers,
> Ben- =D2=FE=B2=D8=B1=BB=D2=FD=D3=C3=CE=C4=D7=D6 -
>
> - =CF=D4=CA=BE=D2=FD=D3=C3=B5=C4=CE=C4=D7=D6 -

thanks a lot.
English is my secend langugage,so sometimes I don't know how to
describe my problem:)
```
 0
Reply wfzhao (11) 3/24/2008 6:49:03 AM

3 Replies
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