Clipping ECW

[Rob Schneider - Aurchem Exploration]

Hi,

I have an .ecw that is about 1.35 GB (53946 x 39606) which is just too
big to handle. Is there any FREE way to clip this in mapinfo (or outside
of mapinfo)

Cheers,
Rob

[Rob Schneider - Aurchem Exploration]

Sorry ignore - already asked a few weeks ago.

> .
>
>

[John Elliot]

Rob,
Irfan View, a free program, will open ecw and the image can then be cropped.

Regards,

John Elliot
Anzeco Pty. Limited
mineral exploration consulting services
Bathurst, NSW 2795, AUSTRALIA

[Rob Schneider - Aurchem Exploration]

Thanks. It would only show thumbnails - it errored trying to open the full file.

John Elliot wrote:

.

  

[SCISOFT]

Rob

There is a free and updated version of the ER Mapper Image Compressor – but you will need to pay for image sizes larger than 50Mb (there is a sliding scale for licensing). Apart from mosaicking and compression, I believe it will also allow image trimming. You need to check out the documentation page (I am having a look to see what its capabilities are, right now).

I have always found Irfanview to be insufficient for ECW files. It can’t handle anything large.

 

IL Thomas
GeoSciSoft  - Perth, Australia

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[Rob Schneider - Aurchem Exploration]

Just tried it - but was very confused - just downloaded ERMapper and am using it, it will do what I want if I can figure it out. Unfortunately I am running Vista and it is not yet Vista compatible, it does run but the help files don't and I can't find a pdf manual. I have however found a forum post and am plodding through it.
This would seem like a simple project, thank god for proprietary formats to keep us busy :)

[SCISOFT]

Rob

The Image Compressor v7.2 has 4 docs (PDF) and the summary one for 2007 does indicate that it has a clip regions function, which is wizard-driven. And the tutorial (which doesn’t include the Clip function) seems clearly-written for the other functions including the mosaicking.

Have you downloaded a trial version of ER Mapper itself, or of this utility?  What are the help files - .HLP format, rather than .CHM?

 

Ian Thomas
GeoSciSoft  - Perth, Australia

[Rob Schneider - Aurchem Exploration]

I did have the Image Compressor installed but the wizard was very hard to use. I have since downloaded the full ERMapper but it's helpfiles are in .hlp

[Rob Schneider - Aurchem Exploration]

Success. The ermapper forum post got me half way there (http://forums.ermapper.com/viewtopic.php?t=402) and I pushed enough buttons to complete the task. It looks to be the same resolution as the original and supposedly is also georeferenced (but that wasn't a need).

FYI: In my search for a solution to non-georeferenced clipping (cropping) of an ecw I did also find a Photoshop plugin that looked like a good solution but photoshop can only handle images of 30000 x 30000 pixels.

'Thanks' to everyone involved.
Cheers,
Rob

[SCISOFT]

Rob- can you give the URL for the Photoshop plugin, please? There is a good chance that it also works with Canvas for Windows (now owned by ACD Systems).

 

Thanks

IL Thomas
GeoSciSoft  - Perth, Australia

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From: mapi...@googlegroups.com [mailto:mapi...@googlegroups.com] On Behalf Of Rob Schneider - Aurchem Exploration
Sent: Wednesday, May 02, 2007 9:13 AM
To: mapi...@googlegroups.com
Subject: [MI-L] Re: Clipping ECW

 

Success. The ermapper forum post got me half way there (http://forums.ermapper.com/viewtopic.php?t=402) and I pushed enough buttons to complete the task. It looks to be the same resolution as the original and supposedly is also georeferenced (but that wasn't a need).

[Richard Greenwood]

FW Tools can read/write/clip/reproject ECW and numerous other formats:
http://fwtools.maptools.org/
Because it is Open Source, it is not restricted to the 500MB ER Mapper
ECW encoder license. However it is command line driven, which is to
say it has a little steeper learning curve than some people are
willing to climb.

--
Richard Greenwood
richard....@gmail.com
www.greenwoodmap.com

[Llewellyn, David]

Richard and Listers,

Do you know of any resource for finding examples of command line uses of
FWTools for such tasks as clipping ECW files?

Cheers

David Llewellyn

-----Original Message-----
From: mapi...@googlegroups.com [mailto:mapi...@googlegroups.com] On
Behalf Of Richard Greenwood
Sent: Wednesday, 2 May 2007 10:43 AM
To: mapi...@googlegroups.com
Subject: [MI-L] Re: Clipping ECW

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[Rob Schneider - Aurchem Exploration]

Although I got it through a 3rd party here it is:

http://www.ermapper.com/Downloads.aspx?v=145

It installed and seemed to work with Photoshop CS3 on Vista also.

[SCISOFT]

Thanks – I located it there myself. I should have remembered (in fact, I got there in a round-about way from a plugins website).

[Richard Greenwood]

On 5/1/07, Llewellyn, David <dav...@nntt.gov.au> wrote:
>
>
> Richard and Listers,
>
> Do you know of any resource for finding examples of command line uses of
> FWTools for such tasks as clipping ECW files?

Most Open Source projects have a mailing list, gdal-dev is the one I'm
on, but there may be one more specific to FW Tools. The application
that you want to use is gdal_translate. The basic syntax is;
gdal_translate source.ecw destination
which will convert your ecw to a geotiff, because geotfiff is the
default output type. To generate an ecw you'd use:
gdal_translate -of ECW source.ecw destination.ecw
The -of flag sets the output format. But this is limited to 500MB. To
get past that you'd use:
gdal_translate -of ECW --config ECW_LARGE_OK YES
You can adjust the compression level with -co target=xx I use (xx=87)
You can embed projection info with something like:
-co "PROJ=TMWYO4FT" -co "DATUM=NAD83" -co "UNITS=FEET"
or you can use the free, standalone header editor from ER Mapper. You
can crop the image in two ways:
-srcwin xoff yoff xsize ysize
or:
-projwin ulx uly lrx lry
srcwin allows you to define the crop window in pixels, relative to the
source image. projwin allows you to define the clip region in
real-world coordinates.

Rich