| Re: ENVI header files in IDL [message #59156 is a reply to message #58947] |
Mon, 10 March 2008 19:30  |
raghuram
Messages: 32
Registered: February 2008
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Member |
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On Feb 27, 10:36 am, Jean H <jghas...@DELTHIS.ucalgary.ANDTHIS.ca>
wrote:
> Raghu wrote:
>> Hi,
>
>> In IDL, i'm using filesearch function to read through files of certain
>> types.
>> Since an envi file has no specific extension, i'm not able to figure
>> out how to sort out the files.
>> Here's an example:
>
>> Say i have 2 images in ENVI format. It would look like IMAGE1,
>> IMAGE1.hdr,IMAGE2, IMAGE2.hdr.
>> As you can see, its only the header file which has the extension. When
>> i use the filesearch(image*), i am not
>> able to ignore the header files. These header files are not to be
>> processed.
>
>> Any ideas of how to choose only the images and not the header files,
>> as in this case ?
>> I guess i could convert the files to IMG so that they have an
>> extension, but there must be an easier way.
>
>> Thanks,
>
>> Raghu
>
> Hi,
> you can do a filesearch on the headers only
> filesToOpen = filesearch('image*.hdr') --> all that start with 'image'
> and ends with '.hdr')
> then remove the last 4 characters from the strings. Test if the file
> exists. If yes, open it. If not, try to add the common extensions (.dat,
> then .img etc). Of course, sort the order of the extensions (nothing,
> .dat etc) so that most images to process have the first extension (or
> lack of extension).
>
> here is a slightly different code that I use. The user select a file. If
> there is no extension in that file, it is open. Otherwise, the code
> looks for the file with the possible extensions.
>
> fileToOpen = dialog_pickFile(path = searchFolder, GET_PATH =
> searchFolder, /must_exist, title = title)
>
> ;If the user selected a .hdr, remove the extension and find the correct
> one.
> if (STRLOWCASE(strmid(fileToOpen,3, /REVERSE_OFFSET)) eq '.hdr') or
> (STRLOWCASE(strmid(fileToOpen,3, /REVERSE_OFFSET)) eq '.aux') then begin
> fileToOpen= strmid(fileToOpen, 0,strlen(fileToOpen)-4)
>
> extensionNotFound = 1B
> currentExtension = 0
> tmpFileToOpen = fileToOpen
> commonExtensions = ['.dat','.img']
> while extensionNotFound and currentExtension lt
> n_elements(commonExtensions) do begin
> if FILE_TEST(tmpFileToOpen) eq 0 then begin
> tmpFileToOpen = fileToOpen + commonExtensions[currentExtension]
> currentExtension +=1
> endif else begin
> extensionNotFound = 0B
> fileToOpen = tmpFileToOpen
> endelse
> endwhile
>
> endif
>
> Jean- Hide quoted text -
>
> - Show quoted text -
Hi,
I got a very simple answer to my question from James Jones on the
ITTVIS usergroup.
Here it is:
images=FILE_SEARCH('*[^\.{hdr}]', /QUOTE)
In this case, the file_search function ignores the hdr files and reads
in only whats left.
Credit to James Jones for this.
Thanks,
Raghu
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