| Re: Image composition [message #41114] |
Fri, 01 October 2004 06:17 |
jcesq
Messages: 9
Registered: October 2004
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Junior Member |
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Thanks Marshall, I didn't know this operator. I can beging to work on it...
Jeferson
mperrin+news@cymric.berkeley.edu (Marshall Perrin) wrote in message news:<cjfh77$21at$1@agate.berkeley.edu>...
> Jeferson E. <jcesq@terra.com.br> wrote:
>> Hello there!
>>
>> I have several NDVI images of different dates, but with the same size.
>> I want to generate a maximum value composition, in other words, I want
>> just one image containing the maximum value for each pixel during the
>> time series.
>> How can I do that with IDL. That's a very usual procedure, isn't there
>> any code available??
>
> Something like
>
> maximage = image1 > image 2 > image 3 > image4
>
> The ">" operator is not a logical comparison (for that, see "gt") but
> rather an operator which returns the greater of its two operands, and
> works on a pixel-by-pixel basis for images.
>
> - Marshall
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| Re: Image composition [message #41135 is a reply to message #41114] |
Wed, 29 September 2004 16:41  |
mperrin+news
Messages: 81
Registered: May 2001
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Member |
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Jeferson E. <jcesq@terra.com.br> wrote:
> Hello there!
>
> I have several NDVI images of different dates, but with the same size.
> I want to generate a maximum value composition, in other words, I want
> just one image containing the maximum value for each pixel during the
> time series.
> How can I do that with IDL. That's a very usual procedure, isn't there
> any code available??
Something like
maximage = image1 > image 2 > image 3 > image4
The ">" operator is not a logical comparison (for that, see "gt") but
rather an operator which returns the greater of its two operands, and
works on a pixel-by-pixel basis for images.
- Marshall
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