[Gdal-dev] ecw-compressing >500MB files

[Ken Boss]

>>>> fwarmerdam at gmail.com 5/12/2005 6:11:41 PM >>>
>On 5/12/05, Ken Boss <Ken.Boss at dnr.state.mn.us> wrote:
>> Under FWTools 0.9.8, I can successfully use gdal_translate to
generate
>> an ECW output from a 400 MB input file.  If I try to do the same
with a
>> 750 MB input, however, I get:
>> 
>> gdal_translate -of ECW -co target=95 two_tiles.tif two_tiles.ecw
>> Input file size is 18988, 14016
>> 0.100 - done.
>> ERROR 4: `d:\ken_mrsid\test_tiles\two_tiles.ecw' does not exist in
the
>> file syst
>> em,
>> and is not recognised as a supported dataset name.
>> 
>> I'm guessing this might owe to input file size limitations, but
looking
>> at the ECW 3.1 SDK page at http://www.ermapper.com/ecw/ and the
price
>> list at http://www.ermapper.com/document/doc.aspx?doc_id=54, I'm
left
>> with the distinct impression that the free GPL-style license for the
SDK
>> (surely this is what gdal uses?) provides unlimited compression.
>
>Ken,
>
>I believe that the file size limitation is what you are running into.

>I believe the FWTools 0.9.8 supports large files, but you need to
>"tell" the software you have the legitimate right to compress large
>files. This is accomplishing by setting the ECW_LARGE_OK 
>creation option to YES. 
>eg. 
>
>gdal_translate -of ECW -co ECW_LARGE_OK=YES big.tif big.ecw
>
>Note that by setting this flag, it is my intent that you are
acknowledging
>that you have conformed with any requirements of the ECW license.
>
>Best regards,
>-- 
>---------------------------------------+--------------------------------------
>I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at pobox.com 
>light and sound - activate the windows | http://pobox.com/~warmerdam 
>and watch the world go round - Rush    | Geospatial Programmer for
Rent
>_______________________________________________

Frank--

Sounds great, but in fact:

gdal_translate -of ECW -co ECW_LARGE_OK=YES
d:/ken_tmp/test_tiles/two_tiles.tif
d:/ken_tmp/mosaicked_tiles/two_tiles.ecw
Input file size is 18988, 14016
0.100 - done.
ERROR 4: `d:/ken_tmp/mosaicked_tiles/two_tiles.ecw' does not exist in
the file s
ystem,
and is not recognised as a supported dataset name.

Perhaps I need simply to wait patiently for 0.9.9 (or, as Brent
suggests, recompile against the newer SDK myself)?

--Ken