[Geoserver-users] Large ECW files

GeoServer GeoServer User
1

Hi,

I have a number of large ECW files (+40MB) that I would like to serve out as a WMS.

Can geoserver handle this and if so how?

Thanks,
Jerry

2

Size isn't an issue for GeoServer, it often serves of files that are
many gigabytes in size. But as for ecw files, it doesn't serve them
(at least I don't think so).

On 4/16/07, Jerry O'Sullivan <jeremiahosullivan@anonymised.com> wrote:

Hi,

I have a number of large ECW files (+40MB) that I would like to serve out as
a WMS.

Can geoserver handle this and if so how?

Thanks,
Jerry
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3

Jerry O'Sullivan ha scritto:

Hi,
I have a number of large ECW files (+40MB) that I would like to serve out as a WMS.
Can geoserver handle this and if so how?

Geoserver cannot read ECW at the moment. Your best bet is to
turn them into JPEG compressed Geotiff files, with tiles and overviews,
using gdal_translate.

Cheers
Andrea

4

This may be of use to you Brent (Although the pyramiding doesn't work)

http://docs.codehaus.org/display/GEOSDOC/Load+NASA+Blue+Marble+Data

It describes how to turn the ecw's into geotiffs

-----Original Message-----
From: geoserver-users-bounces@lists.sourceforge.net
[mailto:geoserver-users-bounces@lists.sourceforge.net] On Behalf Of Brent
Owens
Sent: Monday, April 16, 2007 5:55 PM
Cc: geoserver-users@lists.sourceforge.net
Subject: [Geoserver-users] Fwd: Large ECW files

Size isn't an issue for GeoServer, it often serves of files that are
many gigabytes in size. But as for ecw files, it doesn't serve them
(at least I don't think so).

On 4/16/07, Jerry O'Sullivan <jeremiahosullivan@anonymised.com> wrote:

Hi,

I have a number of large ECW files (+40MB) that I would like to serve out

as

a WMS.

Can geoserver handle this and if so how?

Thanks,
Jerry
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Download DB2 Express C - the FREE version of DB2 express and take
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_______________________________________________
Geoserver-users mailing list
Geoserver-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geoserver-users

--
Brent Owens

--
Brent Owens

-------------------------------------------------------------------------
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Download DB2 Express C - the FREE version of DB2 express and take
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5

Thanks Andrea

The problem I was coming up against was that I was trying to merge my ecws into a single tiff using gdal_merge and I was hitting a 4mb limit.

When I used the gdal_tranlsate to translate my 11MB ecw to tiff it went up to 1GB!, As I have a lot of these ecw files I will have to think about another way of serving them up.

I will try your suggestion of JPEG compressed Geotiff files tomorrow, do you have any examples of the syntax for this?

Thanks
Jerry

On 16/04/07, Andrea Aime <aaime@anonymised.com> wrote:

Jerry O’Sullivan ha scritto:

Hi,

I have a number of large ECW files (+40MB) that I would like to serve
out as a WMS.

Can geoserver handle this and if so how?

Geoserver cannot read ECW at the moment. Your best bet is to
turn them into JPEG compressed Geotiff files, with tiles and overviews,
using gdal_translate.

Cheers
Andrea

6

Jerry O'Sullivan ha scritto:

Thanks Andrea
The problem I was coming up against was that I was trying to merge my ecws into a single tiff using gdal_merge and I was hitting a 4mb limit.
When I used the gdal_tranlsate to translate my 11MB ecw to tiff it went up to 1GB!, As I have a lot of these ecw files I will have to think about another way of serving them up.
I will try your suggestion of JPEG compressed Geotiff files tomorrow, do you have any examples of the syntax for this?

Hem, no. Have a look at both the gdal_translate help page at www.gdal.org and at the geotiff format help page on the same site to
look at the creation options.
Then add the overviews with gdaladdo.

Cheers
Andrea

7

The limit on the size of TIFFs is 4GB, so you should be fine. If you
get above the 4GB limit, you can create several TIFFs and just load
them as separate layers in GeoServer. Also, GeoServer can handle 1GB
tiffs just fine, you might have to split them up into a pyramid, but
it can still serve them up quite well. Check out this tutorial on how
to serve up large rasters:
http://docs.codehaus.org/display/GEOSDOC/Load+NASA+Blue+Marble+Data

cheers,

On 4/16/07, Jerry O'Sullivan <jeremiahosullivan@anonymised.com> wrote:

Thanks for the quick reply Brent

The problem I was coming up against was that I was trying to merge my ecws
into a single tiff using gdal_merge and I was hitting a 4mb limit.

When I used the gdal_tranlsate to translate my 11MB ecw to tiff it went up
to 1GB!, As I have a lot of these ecw files I will have to think about
another way of serving them up.

Any ideas?

Thanks
Jerry

On 16/04/07, Brent Owens <brentowens@anonymised.com> wrote:
> Size isn't an issue for GeoServer, it often serves of files that are
> many gigabytes in size. But as for ecw files, it doesn't serve them
> (at least I don't think so).
>
> On 4/16/07, Jerry O'Sullivan <jeremiahosullivan@anonymised.com> wrote:
> > Hi,
> >
> > I have a number of large ECW files (+40MB) that I would like to serve
out as
> > a WMS.
> >
> > Can geoserver handle this and if so how?
> >
> > Thanks,
> > Jerry
> >
-------------------------------------------------------------------------
> > This SF.net email is sponsored by DB2 Express
> > Download DB2 Express C - the FREE version of DB2 express and take
> > control of your XML. No limits. Just data. Click to get it now.
> > http://sourceforge.net/powerbar/db2/
> > _______________________________________________
> > Geoserver-users mailing list
> > Geoserver-users@lists.sourceforge.net
> >
https://lists.sourceforge.net/lists/listinfo/geoserver-users
> >
>
> --
> Brent Owens
>

--
Brent Owens

8

Hey Andrea,

I converted the ecw’s to tiff with the tiled and JPEG options but the image gets corrupted :(. Have you any ideas on this. At the moment I am going with Tiff LZW which is a larger file but at least correct.

Forgive my ignorance but what are overviews and why should I have them?

Thanks
Jerry

On 16/04/07, Andrea Aime <aaime@anonymised.com> wrote:

Jerry O’Sullivan ha scritto:

Thanks Andrea

The problem I was coming up against was that I was trying to merge my
ecws into a single tiff using gdal_merge and I was hitting a 4mb limit.

When I used the gdal_tranlsate to translate my 11MB ecw to tiff it went
up to 1GB!, As I have a lot of these ecw files I will have to think
about another way of serving them up.

I will try your suggestion of JPEG compressed Geotiff files tomorrow, do
you have any examples of the syntax for this?

Hem, no. Have a look at both the gdal_translate help page at
www.gdal.org and at the geotiff format help page on the same site to
look at the creation options.
Then add the overviews with gdaladdo.

Cheers
Andrea