| Landsat Image weirdness - IDL off topic [message #65694] |
Mon, 16 March 2009 13:53  |
Jean H.
Messages: 472
Registered: July 2006
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Senior Member |
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Hi all,
Not too sure where to ask this question... hopefully someone here will know!
Ok, I have downloaded a Landsat 7 ETM+ image from USGS (by the way,
their new service, with free historical images is awesome!!)
... but it doesn't look as I hoped it would.. have a look here:
http://www.environmentalmodelers.com/WP/sat_img_problem.gif
Basically, I have, perpendicular to the fly path, some black lines.
These lines are not present along the central line of the image, and the
further you are from this center line, the wider are the black lines.
Also, on the edge of the image, I can see some data extensions, which
surprises me even more!
So, is there anything I can do about this? (I guess it is not an Endian
problem as the rest of the image looks good, it's not a data type
problem either, not a band interleave pb as it is a single band)
Thanks a lot!
Jean
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| Re: Landsat Image weirdness - IDL off topic [message #65695 is a reply to message #65694] |
Mon, 16 March 2009 14:00  |
Jean H.
Messages: 472
Registered: July 2006
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Senior Member |
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Jean H. wrote:
> Hi all,
>
> Not too sure where to ask this question... hopefully someone here will
> know!
>
> Ok, I have downloaded a Landsat 7 ETM+ image from USGS (by the way,
> their new service, with free historical images is awesome!!)
>
> ... but it doesn't look as I hoped it would.. have a look here:
> http://www.environmentalmodelers.com/WP/sat_img_problem.gif
>
> Basically, I have, perpendicular to the fly path, some black lines.
> These lines are not present along the central line of the image, and the
> further you are from this center line, the wider are the black lines.
>
> Also, on the edge of the image, I can see some data extensions, which
> surprises me even more!
>
> So, is there anything I can do about this? (I guess it is not an Endian
> problem as the rest of the image looks good, it's not a data type
> problem either, not a band interleave pb as it is a single band)
>
> Thanks a lot!
> Jean
ok, it's "gap data",areas that fall between ETM+ scans... it seems that
filling data should be available... do you know where I can download
the fill-in data if I have the scene number?
Thanks again,
Jean
PS: sorry for finding out the source of my problem 5 seconds after
sending this email... that must be a murphy's law!
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