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Re: trying to export pixel data from .dat files, based on coordinate loc [message #71713 is a reply to message #71623]

Sat, 10 July 2010 07:16

jeanh
Messages: 79
Registered: November 2009

Member

> file_array=file_search[filepath, '*.dat', count['*.dat']= num_file]

This can not work. You are subscripting a keyword (count), moreover in a
very strange way (IDL is not PHP, you can't really use strings to subset
an array)
try:
file_array=file_search[filepath, '*.dat', count= num_file]

> for i=0, num_file-1 do begin
>
> file=file_array[i]
> print, num_file
>
> ;read ENVI binary file
> read_ENVI_image (file, headerfile= filepath, '*.hdr')
> ;extract pixel information based on lat long coordinates
> b=ENVI_CONVERT_FILE_COORDINATES [106.002, 83.0]

look up the help file for ENVI_CONVERT_FILE_COORDINATES
You are calling it in a totally wrong way... it is a procedure, not a
function. It requires 5 arguments

> v=b
> print, v

this is useless... you can work on b directly (though, once you have
call the ENVI_CONVERT_FILE_COORDINATES procedure the proper way, you
will have 2 variables to handle)

>
> ;open text file to write data to
> OPENU, U, 'pixel_value.txt', /get_lun, /append
> ;write data
> printf, U, v
> ;close LUN
> close, U

For efficiency, you can open the file before the loop, close it after
the loop and simply write your variables within the loop.

>
> endfor
>
> end
>
>

Jean

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[Message index]

		trying to export pixel data from .dat files, based on coordinate loc By: Snow53 on Fri, 09 July 2010 09:53
		Re: trying to export pixel data from .dat files, based on coordinate loc By: jeanh on Mon, 12 July 2010 14:51
		Re: trying to export pixel data from .dat files, based on coordinate loc By: jeanh on Sat, 10 July 2010 07:16
		Re: trying to export pixel data from .dat files, based on coordinate loc By: Jeremy Bailin on Fri, 09 July 2010 21:05

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