| Re: Maps and interpolation w/ invalid data points [message #65956 is a reply to message #65955] |
Mon, 30 March 2009 11:24   |
mankoff
Messages: 131
Registered: March 2004
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Senior Member |
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On Mar 30, 2:12 pm, David Fanning <n...@dfanning.com> wrote:
> mankoff writes:
>> I'm having trouble with making smoothed maps with invalid data points.
>> I'm able to produce maps with grayed invalid boxes when there is no
>> smoothing (bilinear=0 in map_image). I'm able to produce interpolated
>> images without getting the rainbows around the invalid points by using
>> TRIANGULATE and TRIGRID.
>
>> But I'm having trouble combining these two techniques.
>
>> My input data is 72 by 44, so map_image replicates most of the data
>> points when returning an array around 500 by 300. If /BILINEAR is set
>> then I get rainbows around the invalid data points. If it is not set,
>> and I run my triangulate & trigrid algorithm it doesn't have much
>> effect due to the repetition of similar values due to the enlarged
>> warped array. Setting MIN_VALUE and MISSING keywords to map_image
>> doesn't help either.
>
>> It seems like if I set the output size of the map to be tiny, so that
>> map_image did not enlarge the array, then it would work. If producing
>> postscript I could blow it up after and it would still look good. But
>> this seems like a strange workaround.
>
> I don't follow the reasoning here. Wouldn't you fix
> the small 72 by 44 image with your Triangulate and Trigrid
> method first, then warp this into your map space with Map_Image?
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Coyote's Guide to IDL Programming (www.dfanning.com)
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
Yeah I don't follow my reasoning either :). Duh.
Thanks,
-k.
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