| Re: problem of contour [message #59325] |
Sun, 23 March 2008 23:49  |
wfzhao
Messages: 11
Registered: March 2008
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Junior Member |
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On 3月24日, 上午4时35分, "ben.bighair" <ben.bigh...@gmail.com> wrote:
> On Mar 22, 12:30 am, wfz...@bjmb.gov.cn wrote:
>
>
>
>
>
>> On 3月21日, 下午10时36分, 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 (seehttp://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- 隐藏被引用文字 -
>
> - 显示引用的文字 -
thanks a lot.
English is my secend langugage,so sometimes I don't know how to
describe my problem:)
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