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| Subject: | Re: GISList: Working with large rasters ~100Gb and GIS |
| Date: |
03/17/2003 10:17:19 AM |
| From: |
viktoras |
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I used to work with much smaller raster images and databases and it
sometimes takes couple of days to perform quite simple routine analysis on
them using just one computer.
Doubt if there is any graphics or GIS software for MS Windows able to
display, handle or even save entire 100Gb rasters easily.
Let's see three possible alternative solutions:
1) using parrallel computing system with GRASS software
or
2) hiring somebody to write specific scripts or software to analyse this
raster.
3) split the raster into pieces smaller than 1 GB and try working with them.
You should be able to join needed several pieces dynamicaly when needed.
Regards
Viktoras Didziulis
----- Original Message -----
From: "Bannerman Bruce" <BRUBAN@melbourne.vic.gov.au>
To: <gislist@geocomm.com>: "'IMAGRS-L@CESNET.CZ'" <IMAGRS-L@cesnet.cz>
Sent: Thursday, March 06, 2003 9:07 PM
Subject: GISList: Working with large rasters ~100Gb and GIS
> Hello everyone,
>
> Apologies for cross-posting.
>
>
> I'm interested in finding real world experiences when working with large
> raster images of approximately 100 Gb.
>
> I'm not interested in claims by vendors.
>
>
> We are about to receive a series of raster images (24bit, TIF 6 format).
> These images have been derived from aerial photography and are >0.1m
> resolution.
>
> When combined they will form an orthophoto mosaic that is ~100 Gb.
>
> *Ideally*, I'd like to manage this data as a single image for ease of use
by
> novice users and for data management purposes.
>
> As we have business requirements that demand high resolution, I'd prefer
not
> to compress the image with a lossy format such as ECW or MrSid.
>
>
> Our GIS environment is ESRI based. ArcGIS 8.3, ArcSDE 8.3, ArcIMS 4.0.1.
> Novice GIS users have access to corporate spatial data via a browser. We
> have no intention of adopting an alternate GIS.
>
>
> Our preferred solution is to manage the raster data via ArcSDE.
> Unfortunately, I'm finding it difficult to find an organisation that has
> experience working with data similar to ours.
>
> An alternate solution if ArcSDE proves not to be viable is to use
ERMapper's
> Image Web Server, despite the data loss issues.
>
>
> Does anyone have any real world experiences when working with large ~100
Gb
> raster data and GIS that they would be willing to share?
>
> In particular I'm interested in response times experienced by end users.
>
> Any thoughts would be appreciated.
>
>
> Regards,
>
> Bruce Bannerman
> GIS Strategy Officer
> City of Melbourne
> Australia
>
>
>
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