The problem is, as I understand it, that Juan is not using Windows but
Linux. And while
ECW&Mrsid support is simply added by
the user to the current binary distribution of qgis
for windows (i.e., see
http://sites.google.com/site/eospansite/qsig-for-windows )
getting the same support for qgis installed from binaries for linux is
simply impossible.
You must go through the much more cumbersome
process of
(1) Compiling gdal with support for ecw and Mrsid
(2) Compiling qgis with that particular gdal
Certainly, not a 5 minutes task (in particular for users who just don't even
know what compiling means...)
So, effectively, regarding qgis, linux users are in disadvantage. Or, in
other
words, for a regular user of qgis, using windows is better. An astonishing
contradiction for gnu software.
The roots of the problem are in gdal, it's true. But the branches are in
qgis
and, after having exchanged messages in the gdal list
http://n2.nabble.com/Tickets-2385-and-2683-(ECW-and-MrSID-plugins)-tt2767156.html#none
I'm convinced that the problem will not be solved unless the communities
behind
programs using gdal get involved.
Agus
Tim Sutton wrote:
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Hash: SHA1
Hi
Alex Mandel wrote:
Juan Pedro Pérez Alcántara wrote:
Hello,
perhaps this is a silly one, but I'm quite frustrated with conversions
from popular raster formats in the Windows/ArcGIS world to the
Linux/QGIS one. For example, ECW and MrSID are most popular. I think
JPEG2000 should be a good candidate for a raster format in QGIS. As far
as I know, it is fast (piramidized by nature, so to say),
georreferenced, and they work flawlessly and smoothly (my experience, at
least) in QGIS. Perhaps all of you, much experienced than me for sure,
think that JPEG2000 is not the way and that GeoTIFF or whatever should
do the job. If it is so, I'll stick obviously to that option instead.
I have been messing around with quite a bunch of libraries to deal with
the conversion. First, there is GDAL, with which I'm able to transform
ECW to almost any GeoTIFF or JPEG that works with QGIS very well, and
with JPEG compression, not so far in size from the ECW source. But then
I tried to use ImageMagick and/or Jasper to convert to JPEG2000, and
here is where I get stuck. I stripped off in gdal_translate the GeoTIFF
tags with BASELINE, but to no avail in ImageMagick, it says always (with
TIFF, JPEG, etc.) that it cannot write the image. Same with JASPER: I
tried to convert from a gdal_translated jpeg, but without result. What
is that I'm missing? Do you have a proven workflow to do this job?
And with MrSID... not experimented by now, but I tremble only thinking
in that :)
Perhaps I'm too obsessed with size (file sizes, I mean!!! :) ), and I'm
messing around too much with that subject, when GeoTIFF is providing
good results with a slight size increase. Given the size of hard drives
today (and that I'm not in the massive storage business in the GIS
scene), I think is a fair trade-off for an easy and straightforward
conversion workflow. I'd like very much to hear your opinions about
this.
Thanks in advance, this is my first post. QGIS is great and thanks to it
and we have almost left behind the so-called industrial standard in GIS.
Congratulations for the great job.
Greetings from Spain,
Juan Pedro Pérez Alcántara
I think I'm a little confused, if you have GDAL compiled with ECW and
MrSID format these should open in QGIS. Note the most recent version of
the windows QGIS standalone is shipping with MrSID support.
FYI, the MrSID license is more open, and LizardTech is a sponsor of OSGEO.
Alex
Also note that if you want ECW support in windows builds of QGIS 1.0.2
or 1.1.0, you can simply download the ECW dlls from Erdas (by getting
the SDK) and place the dlls into the Quantum GIS/bin directory. We could
not include them in the installer by default for licensing reasons, but
by adding those dlls its pretty easy to get it working.
Also note that in my testing the JASPER jp2 raster loading via GDAL is
quite slow (frustratingly slow really) on the only real performant way
to use a wavelet compressed raster at this stage is to use the Kakadu,
Mr Sid or ECW drivers (all of which are proprietary software).
Lastly it is probably more appropriate to use gdal_translate to convert
between raster formats than imagemagick, since gdal's conversions are
'spatially aware' and will retain all georeferencing etc. data in the image.
Regards
- --
Tim Sutton - QGIS Project Steering Committee Member (Release Manager)
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