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 <stevenlgol...@gmail.com
<mailto:stevenlgol...@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
--
View this message in context:
http://osgeo-org.1560.x6.nabble.com/How-to-convert-ECW-using-open-source-packages-into-something-else-tp5218390p5218484.html
Sent from the Quantum GIS - User mailing list archive at Nabble.com.
_______________________________________________
Qgis-user mailing list
Qgis-user@lists.osgeo.org <mailto:Qgis-user@lists.osgeo.org>
http://lists.osgeo.org/mailman/listinfo/qgis-user
_______________________________________________
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user
--
Cheers Simon
_______________________________________________
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user
