[Gdal-dev] problem writing ecw (gdal in FWTools-1.0.5)

[lionel bargeot]

Hi Antoine,

I think it's not my problem.
The first reason is I've tried with the format option LARGE_OK=yes (I 
have a license) and it doesn't work much better.
A second reason is I can produce ecw output when source is tiled geotiff 
images.

I've tried to define more precisely the limit of the output image my WMS 
is able to produce (with tiled ecw images as datasource). This limit is 
2500 x 2500 pixels. With tiled geotiff images as datasource, this limit 
is higher (2GB image output limitation due to my linux kernel option, I 
think)
I've tried 1000x3000 images and it doesn't work neither. So I think that 
if width or height is greater than 2500 pixels, the error message is 
produced.

Thanks for your suggestion

Lionel


Lennox Antoine wrote:
> I wonder if this is the 500MB limit on the free SDK coming into play?
> It would explain why smaller files work.
>
> http://www.remotesensing.org/gdal/frmt_ecw.html
>
> -Lennox
>
> On 8/7/06, Lionel Bargeot <l.bargeot at educagri.fr> wrote:
>   
>>> Hi all,
>>>
>>> I use a WMS server with FWTools-1.0.5 binary distribution on Linux.
>>>
>>> I can serve ECW files (with mapserv as WMS) larger than 50 Mo when the
>>> source is tiled geotif images.
>>> When datasource is tiled ecw files, I have the following error message
>>> when generated images are (about) larger than 4000x4000 pixels :
>>>
>>> msDrawMap(): Image handling error. Failed to draw layer named
>>>       
>> MYLAYERNAME .
>>     
>>> NCScbmReadViewLineBIL failed.: Unable to access file. GDALRasterIO()
>>> failed: drawGDAL()
>>>
>>> For smaller images, no problem
>>>
>>> Any idea ?
>>> Do you think the problem will be solved if I compile my own gdal
>>>       
>> library ?
>>     
>>> Thanks
>>>
>>> Lionel
>>>
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>>>
>>>       
>
>