| Re: a question.. [message #36131] |
Sun, 24 August 2003 14:20 |
Alex Panton
Messages: 2
Registered: August 2003
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Junior Member |
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thank you for replying! i figured it out (yes was i being dense) and
then more annoyingly didn't need to do it anyway d'oh!
cheers
alex
Reimar Bauer wrote:
> Alex Panton wrote:
>
>
>> Hey have a probably very stupid, ignorant and totally dense question
>> but.. its driving me mad!
>>
>> Here goes,
>> If I have say an image of count values which I want to convert to
>> something say albedo. I have no equation just a table of values which
>> say that count 100 equals a value etc.. (I know there is somewhere here
>> I?m being dense!) So basically (!) how can get the image array to look
>> for its dn value in the first column of the table and then replace or
>> generate a new array with the new albedo values in.
>>
>> Anyone got any advice? Help? Wonderful pearls of wisdom?
>>
>> Thanks in advance
>>
>> alex
>
>
> Dear Alex,
>
> I am not sure if I understand right.
>
> first I simulate a data image
>
> IDL> z=bytscl(dist(200))
> IDL>help,z
> Z BYTE = Array[200, 200]
> IDL>window,0,xs=200,ys=200
> IDL>tv,z
>
>
> Would you like now to have set a column of some values to another one.
> e.g. all values less 50
>
> IDL>ix=where(z[0,*] lt 50,count_ix)
> IDL>if count_ix gt 0 then z[0,ix]=255b
>
> IDL> window,1,xs=200,ys=200
> IDL> tv,z
>
> Did you like to do something like this?
>
> Reimar
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| Re: a question.. [message #36133 is a reply to message #36131] |
Sat, 23 August 2003 10:15  |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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Alex Panton wrote:
> Hey have a probably very stupid, ignorant and totally dense question
> but.. its driving me mad!
>
> Here goes,
> If I have say an image of count values which I want to convert to
> something say albedo. I have no equation just a table of values which
> say that count 100 equals a value etc.. (I know there is somewhere here
> I?m being dense!) So basically (!) how can get the image array to look
> for its dn value in the first column of the table and then replace or
> generate a new array with the new albedo values in.
>
> Anyone got any advice? Help? Wonderful pearls of wisdom?
>
> Thanks in advance
>
> alex
Dear Alex,
I am not sure if I understand right.
first I simulate a data image
IDL> z=bytscl(dist(200))
IDL>help,z
Z BYTE = Array[200, 200]
IDL>window,0,xs=200,ys=200
IDL>tv,z
Would you like now to have set a column of some values to another one.
e.g. all values less 50
IDL>ix=where(z[0,*] lt 50,count_ix)
IDL>if count_ix gt 0 then z[0,ix]=255b
IDL> window,1,xs=200,ys=200
IDL> tv,z
Did you like to do something like this?
Reimar
--
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg-i/
============================================================ ======
a IDL library at ForschungsZentrum Juelich
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_lib_intro. html
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