shrug-l: JPEG2000 Compression?

[James Klugh]

We've experienced that as well, it's probably an issue with the implementation of the JP2 file format.  The JP2 image compression for ArcSDE raster layers is unaffected by this problem, however.

-----Original Message-----
From: shrug-l-bounces at lists.dep.state.fl.us
[mailto:shrug-l-bounces at lists.dep.state.fl.us]On Behalf Of Kawula,
Robert
Sent: Thursday, November 03, 2005 8:48 AM
To: Mark.Welsh at dot.state.fl.us; shrug-l at lists.dep.state.fl.us
Subject: RE: shrug-l: JPEG2000 Compression?


Mark,

I can't really help you with your draw speed issue because we do not run
ArcSDE in our group, however we have experienced another issue when
using DOQ's in jp2 format.  We found that we could only display up to 18
jp2's (DOQ's) at one time in ArcMap.  If we add one more it shows up in
the table of contents but does not draw.  Adding an additional image
crashes ArcMap. I doubt that it is a memory issue as I am maxed out and
we have experienced it on different computers.  My solution was to use
the imagery in jpg format and I highly suspect it is a software
limitation.  Has anyone else experienced this problem? Has anyone out
there been able to add and view more than 18 DOQ's in jp2 format within
ArcMap?

************************************************************************
**
Robert J. Kawula, Ph.D.
Florida Fish and Wildlife Conservation Commission
Florida Wildlife Research Institute
620 South Meridian Street 
Tallahassee, FL  32308-1600
Ph.  (850) 488-6661
Fx.  (850) 922-5679
Robert.Kawula at MyFWC.com
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**




-----Original Message-----
From: shrug-l-bounces at lists.dep.state.fl.us
[mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of
Mark.Welsh at dot.state.fl.us
Sent: Wednesday, November 02, 2005 12:41 PM
To: 'shrug-l at lists.dep.state.fl.us'
Subject: shrug-l: JPEG2000 Compression?

We have loaded some high resolution imagery (2005) into ArcSDE 9.1
(oracle) using JPEG2000 compression (quality level 150).  We have
noticed the draw speed for this imagery is very slow.  We have the same
imagery for 2003 that we loaded with JPEG compression, and it draws
instantly.  Basically the only differences is the compression type.  We
have built pyramids, analyzed the block table, used various oracle
optimization techniques, but nothing seems to work.  Anyone else out
there run into this?  Any solutions?  Thanks!

Mark Welsh
GIS Applications Coordinator
Transportation Statistics Office
Florida Department of Transportation
(850) 414-4722
mark.welsh at dot.state.fl.us

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