[gdal-dev] ERDAS Imagine to ERMapper

[Brent Fraser]

Nick,

You could try using gdal_translate to extract a full-res
small geographic window of the incoming Imagine file and the
ERS/BIL to confirm the pixels hold data.

  Personally I think files of 16 to 19 gb are risky, as lot
of apps will not open them.  You may want to use a multi
file tiling scheme.

Brent Fraser
GeoAnalytic Inc.
Calgary, Alberta

>
> I should provide some background.
>
> I have an ERDAS Imagine file of 19 Gigabytes that I want
to import
> into ERMapper. Two other files (next largest size is 16
Gigabytes)
> imported okay. I only have problems with the last image.
>
> The top half of the image is fine. The lower half is all
black.
>
> My supplier can view the entire image at his end.
>
> I used ArcMap to open the image at my end and it is fine.
>
> This confirms that the file itself is okay.
>
> I downloaded GDAL v1.5 and used gdal_translate to go from
> ERDAS Imagine format to ERMapper format as I stated in my
> previous message.
>
> The processing has now finished, and the result is the
same error
> of the lower half of the image being all black.
>
> So, GDAL is giving the same results for me as ERMapper
does. But
> ArcMap displays it fine.
>
> Excuse me, I just thought of something.
>
> Okay, back again. I zoomed in with ArcMap, and after a
while, the
> screen went all black. ERDAS Imagine has pyramid layers
right? Is
> my problem that the pyramid layers are displaying fine but
the
> lowest layer is bad? Is ArcMap initially displaying the
pyramid
> layers whilst ERMapper and GDAL ignore the pyramid layers
to
> access the raw data?
>
> Regards,
> nick
>