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Re: How to correct errors an IDL [message #82375 is a reply to message #82374]

Sat, 08 December 2012 05:44

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Saturday, December 8, 2012 1:12:58 PM UTC+1, Dry in water wrote:
> It seems I found out the reason why it cannot open. Null value (Nodata) of this image is -3.4028234663e+038. Pixel type is float-point, 32 bit. So the number is out of range of float-point. So how can I set null value into 0. Is there any way to do this in IDL.

I guess that you could use the where command. Something like:

LowestValue = 1.0e+030
BadPoints = where((temper gt (-1.0*LowestValue)) && (temper lt LowestValue), Count)
if count ge 0 then temper[BadPoints] = 0.0

This will set to zero all value of Temper within -1.0e+030 and +1.0e+030. You might change LowestValue accordingly to what you consider too small or to what does not give an error anymore.

Given your image size, the "where" method might be slow... I think there were quite a few posts in the past about this.

Cheers,
Helder

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[Message index]

		Re: How to correct errors an IDL By: Dry in water on Sat, 08 December 2012 12:53
		Re: How to correct errors an IDL By: David Fanning on Sat, 08 December 2012 07:31
		Re: How to correct errors an IDL By: Dry in water on Sat, 08 December 2012 07:07
		Re: How to correct errors an IDL By: Mats Löfdahl on Sat, 08 December 2012 06:00
		Re: How to correct errors an IDL By: Mats Löfdahl on Sat, 08 December 2012 05:48
		Re: How to correct errors an IDL By: Helder Marchetto on Sat, 08 December 2012 05:44
		Re: How to correct errors an IDL By: Dry in water on Sat, 08 December 2012 04:12
		Re: How to correct errors an IDL By: Dry in water on Sat, 08 December 2012 02:55
		Re: How to correct errors an IDL By: Mats Löfdahl on Sat, 08 December 2012 00:57

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