shrug-l: Compressing TIFFs

North, Joe Joe.North at
Tue Apr 17 13:22:55 EDT 2007

Some additional ArcScan extension info...I've had success with ArcScan using
the manual vectorization procedure in ArcGIS 9.1.  This is helpful when you
only need to convert a limited number of features from a scanned image (as
opposed to the automated vectorization process that yields sketchy results
((finding the magic vectorization tolerance settings for your image is an art
form)) in all but the cleanest scans and large file sizes).  
Joe North
Environmental Manager
Geographic Information Systems
Watershed Data Services Section
Bureau of Watershed Management
Florida Department of Environmental Protection
2600 Blair Stone Road, Mail Station 3525
Tallahassee, Florida 32399-2400
phone: (850)245-8537
fax: (850)245-7571

From: shrug-l-bounces at
[mailto:shrug-l-bounces at] On Behalf Of Tripp Corbin
Sent: Tuesday, April 17, 2007 12:42 PM
To: Kristal Walsh; shrug-l at
Subject: RE: shrug-l: Compressing TIFFs
Have you tried using ArcScan? I do not think it has a size limit. Other than
that you will need to reduce the actual file size and not through
compression. Compression only reduces the storage size. The image must
decompress into memory when viewed bring it back to it's original size or at
least that is the way I understand it. So you would need to reduce your
resolution, trim the image or some combination of both.
Tripp Corbin, MCP, CFM, GISP
Associate Vice President, GIS/Mapping
ESRI Authorized Instructor
Keck & Wood, Inc. <> 
(678) 417-4013
(678) 417-8785 fax
Keck & Wood, Inc offers instructor led and virtual training for ESRI's ArcGIS
& ArcView software.
Please visit <>  for more
information including a schedule of upcoming classes. 
	-----Original Message-----
	From: shrug-l-bounces at
[mailto:shrug-l-bounces at] On Behalf Of Kristal Walsh
	Sent: Tuesday, April 17, 2007 11:42 AM
	To: shrug-l at
	Subject: shrug-l: Compressing TIFFs
	Good morning everybody, I have received a large TIFF of an old
scanned map that is approx. 450mb.  I georeferenced it and tried to convert
to vector for further clean-up but spatial analyst is giving me an 'over the
max 2GB' error.  I tried a lossee compression because I just need the
boundaries from the map but this did not help and took over 2 hours to
process.  Can anyone give me a suggestion? Thanks! Kristal
	Kristal Walsh, GIS Specialist
	Baskerville-Donovan, Inc.
	449 W. Main Street
	Pensacola, Florida 32502
	(850) 438-9661, ext. 4354
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