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Re: Problem regarding ENVI file opening [message #93611 is a reply to message #93608]

Mon, 05 September 2016 01:08

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Sunday, September 4, 2016 at 3:30:13 PM UTC+2, Suresh Negi wrote:
> On Friday, September 2, 2016 at 6:47:00 PM UTC+5:30, wlandsman wrote:
>> On Friday, September 2, 2016 at 1:08:31 AM UTC-4, Suresh Negi wrote:
>>> On Thursday, September 1, 2016 at 3:50:10 PM UTC+5:30, Helder wrote:
>> .
>>>>
>>>> Type this in the command line:
>>>> IDL> query_tiff(file)
>>>> or
>>>> IDL> query_tiff('Composite_image1.tif')
>>>>
>>>> What does it show?
>>>>
>>>> Cheers
>>>
>>> Showing syntax error. can you please give me the script to open ENVI tiff file with full band information.
>>> Thank You
>>
>> What version of IDL do you have? If you have an old version (prior to V8.0 I think) you have to type
>>
>> IDL> print, query_tiff('Composite_image1.tif')
>>
>> so you don't get a syntax error
>
> It is showing 0

Ok, that's something to start with.
You see, if you type this:

IDL> print, query_tiff('thisFileDoesNotExist.tif')
0

You will always get zero. If the file exists, then you get something like this:
IDL> print, query_tiff('E:\aRealDirectory\thisFileExists.tif')
1

Now here is the catch. This is all described here:
http://www.harrisgeospatial.com/docs/QUERY_TIFF.html
and here:
http://www.harrisgeospatial.com/docs/query___routines.html

And you can do more... once you get a 1 as a response (the file exists!) then you can try this:

IDL> print, query_tiff('E:\aRealDirectory\thisFileExists.tif', moreInfo)
1
IDL> help, moreInfo
** Structure <16c13620>, 19 tags, length=152, data length=136, refs=1:
CHANNELS LONG 1
DIMENSIONS LONG Array[2]
HAS_PALETTE INT 0
IMAGE_INDEX LONG 0
NUM_IMAGES LONG 1
PIXEL_TYPE INT 12
TYPE STRING 'TIFF'
BITS_PER_SAMPLE LONG 16
ORIENTATION LONG 1
PLANAR_CONFIG LONG 1
PHOTOMETRIC LONG 1
POSITION FLOAT Array[2]
RESOLUTION FLOAT Array[2]
UNITS LONG 2
TILE_SIZE LONG Array[2]
DESCRIPTION STRING ''
DOCUMENT_NAME STRING ''
DATE_TIME STRING ''
VERSION LONG 42

You see what happened? He got a lot of information from the tiff header! If you want to know what the dimensions are, then type:
IDL> print, moreInfo.dimensions
1024 1024
My file has 1024 rows and 1024 columns.

See how it works?

Try the above and see what happens. Remember to put the full path ('E:\aRealDirectory\') before the file name (an alternative would be to use the CD command, but one thing at a time...).

Try reading the documentation. It IS helpful.

Good luck!

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[Message index]

		Problem regarding ENVI file opening By: Suresh Negi on Thu, 01 September 2016 03:02
		Re: Problem regarding ENVI file opening By: Suresh Negi on Thu, 01 September 2016 03:13
		Re: Problem regarding ENVI file opening By: Helder Marchetto on Thu, 01 September 2016 03:20
		Re: Problem regarding ENVI file opening By: Suresh Negi on Thu, 01 September 2016 22:08
		Re: Problem regarding ENVI file opening By: Suresh Negi on Sun, 04 September 2016 06:29
		Re: Problem regarding ENVI file opening By: Suresh Negi on Sun, 04 September 2016 06:30
		Re: Problem regarding ENVI file opening By: Helder Marchetto on Mon, 05 September 2016 01:08
		Re: Problem regarding ENVI file opening By: Suresh Negi on Tue, 06 September 2016 00:57

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