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Re: Raster to Vector [message #43364 is a reply to message #36454]

Thu, 07 April 2005 12:49

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Julio writes:

> A have a TIF image and I want to make a raster to vector conversion of
> some DN values.
>
> I'm using rtf_doit:
>
> values = [4096] ; the DN I want to convert
> l_name = [values]
> out_names = dir+'testimg_' + $
> strcompress(string(values),/remove_all) + '.evf'
> in_memory = lonarr(n_elements(values))
>
> envi_toggle_catch
> envi_doit, 'rtv_doit', $
> fid=fid, pos=pos, dims=dims, $
> values=values, l_name=l_name, $
> in_memory=in_memory, $
> out_names=out_names
>
> But I have no success... I have the message:
>
> % Subscript range values of the form low:high must be >= 0, < size,
> with low <= high: <BYTE ( 179)>.
> % Execution halted at: EVF_INIT_FILE
>
> What could be the problem???

I would guess that this line:

in_memory = lonarr(n_elements(values))

is not doing what you think it is doing. :-)

Why don't you print out N_ELEMENTS(values) and see what you think.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		raster to vector conversion By: aesculapx on Wed, 17 September 2003 10:36
		Re: Raster to Vector By: David Fanning on Thu, 07 April 2005 12:49
		Re: Raster to Vector By: julio on Fri, 08 April 2005 09:41

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