|
|
| GeoCommunity Mailing List |
| |
| Mailing List Archives |
| Subject: | RE: GISList: Working with large rasters ~100Gb and GIS |
| Date: |
03/17/2003 10:17:20 AM |
| From: |
Hobbs, Jeff |
|
|
Bruce,
We have actually received over 1 terrabyte of orthoimagery and was faced
with a similar problem. However we are a mixed environment (Intergraph,
MapInfo, ESRI, AutoDesk, and Bentley). We need to support all of these
options. We decided to go with ER Mapper. We have found the speed to be more
than excellent. The plug-in for both ArcGIS and ArcView 3.1+ is free.
Furthermore, if you purchase the Image Web Server, not only can you server
up the imagery on the web, but you can also use the speed internally to the
plug-in. We are actually going to experiment with SDE to serve up the
imagery as well. However that will be for a secondary approach.
I offer this feedback primarily because I have been forced to deal with the
same issues. We actually own a copy of both ER Mapper and LizardTech
GeoExpress 3.0. We have evaluated both and were not happy with the quality
of LizardTech technology. It is also my understanding that LizardTech
licenses their product depending on the size of the compressed file. You
will want to clarify this - however that is what I thought I heard a little
while ago. With ER Mapper, you can compress all into one giant .ecw (100 gb
if I recall in your case).
Anyhow, just wanted to offer my feedback. Since I had (and am still) dealing
with a similar issue.
FYI,
Jeff
-----Original Message-----
From: Bannerman Bruce [mailto:BRUBAN@melbourne.vic.gov.au]
Sent: Thursday, March 06, 2003 21:08
To: 'gislist@geocomm.com': 'IMAGRS-L@CESNET.CZ'
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
======================================
==
IMPORTANT:
This e-mail message and any attachments are confidential and may contain
copyright material of Melbourne City Council (MCC) or third parties. It is
intended only for the use of the individual or entity named. If you are not
the intended recipient, any dissemination, copying or use of the information
is strictly prohibited.
Please check this e-mail for undetected viruses before opening. MCC's
liability for the transmission of viruses is limited to the re-supply of the
e-mail and any attachments or to the costs of such re-supply.
MCC policy expressly forbids the dissemination of offensive or inappropriate
material by e-mail.
If you receive this e-mail in error or in breach of these conditions, please
advise Melbourne City Council by e-mail to enquiries@melbourne.vic.gov.au or
by telephone on (03)9658 9658, then delete the e-mail immediately.
To unsubscribe, write to gislist-unsubscribe@geocomm.com
________________________________________________________________________
GeoCommunity GeoBids - less than $1 per day!
Get Access to the latest GIS & Geospatial Industry RFPs and bids
http://www.geobids.com
Online Archive of GISList (and numerous others) available at:
http://spatialnews.geocomm.com/community/lists/
Setup a GeoCommunity Account and have access to
the GISDataDepot DRG & DOQQ Catalog
http://www.geocomm.com/login.php
To unsubscribe, write to gislist-unsubscribe@geocomm.com
________________________________________________________________________
GeoCommunity GeoBids - less than $1 per day!
Get Access to the latest GIS & Geospatial Industry RFPs and bids
http://www.geobids.com
Online Archive of GISList (and numerous others) available at:
http://spatialnews.geocom
|
|
Sponsored by:
For information
regarding
advertising rates
Click Here!
|
