[Qgis-user] How to convert ECW using open source packages into something else? [ANSWERED]

[Simon Cropper]

Thanks everyone.

I got the message "GeoTiff is the preferred alternative file format to 
ECW and gdal on Windows the method of converting the ECW to GeoTiff".

It's lucky I still have access to a Windows machine :-D but wonder what 
I would do if I only had access to Linux :-\

Again, thanks for the timely responses

On 05/08/15 07:29, Enrique wrote:
> As recommended by Paul Ramsey, tiled schema is a better option, so I 
> add it to gdal_translate command.
>
> Thanks!
>
>
> a. Reading ECW and compressing to JPG (set your favourite quality, 80 
> is a good choice for orthoimages; also CACHEMAX could be increased):
>
> gdal_translate --config GDAL_CACHEMAX 1000 --config GDAL_PAM_ENABLED 
> NO -of GTIFF -co COMPRESS=JPEG -co TILED=YES -co JPEG_QUALITY=80 -co 
> PHOTOMETRIC=YCBCR "source_image.ecw" "target_image.tif"
>
> b. Adding internal pyramids/overviews with JPG compression (select 
> your resampling method, I prefer average):
>
> gdaladdo --config COMPRESS_OVERVIEW JPEG --config PHOTOMETRIC_OVERVIEW 
> YCBCR --config INTERLEAVE_OVERVIEW PIXEL -r average "image.tif" 2 4 8 
> 16 32 64 128
>
>
> 2015-08-04 17:23 GMT+02:00 Steve Golden <stevenlgolden at gmail.com 
> <mailto:stevenlgolden at gmail.com>>:
>
>     If you have access to Windows XP and can install GDAL,
>     gdal_translate is the
>     way to go to convert ECW to something else and GeoTIFF should be
>     on your
>     list for that something else.  There are a lot of webpages out
>     there with
>     sample gdal_translate commands, but I recommend reading about  GeoTIFF
>     compression
>     <http://blog.cleverelephant.ca/2015/02/geotiff-compression-for-dummies.html>
>     from a very good source.
>
>     -Steve
>
>
>
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-- 
Cheers Simon
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