Hi, What went wrong with the compression attempt ? 20GB is not all that big in terms of ECW compression (the largest we have heard of is 1.2TB with about 16,000 input files).
ER Mapper 6.3 has an faq on compression in the online help (end of compression chapter of the reference manual). It gives some hints about how to maximize your setup for compression efficiency, and guidelines on the size/rates you can expect for different sized compressions. I have included some of this info below. Hope it helps. cheers Mike - Compression speed depends on the process involved, number and size of input datasets and hardware details. - following data is based on local processing (non-network) - mosaicing, balancing and compression - of standard RGB airphotos, i.e., the figures indicate process intensive tasks. - Where compression rates exceed 10GB/hour, disk input/output (read/write) needs to be able to sustain 6MB/sec read and 6MB/sec write operations. - Peak compression speed reported has been 28GB/hour on a PC with a 1.4GHz Athlon CPU, during a simple compression (no mosaicing and balancing). CPU Single 800 MHz - 1.2 GHz Dual 800 MHz - 2GHz Dual 2GHz + RAM 256 - 512 MB 512 - 1.0GB 1.0 - 2.0GB No. of Datasets Files <50 or 10K x 10K pixels <1000 or 100K x 100K pixels 16,000 or 250MB Input Dataset Dimensions <300MB <30GB 30GB ->1.2TB Compression Rate (GB/Hour) 1.5 - 2.5 3.0 - 5.0 10 Approx. Compression Time 10 - 15 minutes 6 - 10 hours 3 days > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Paul Lohr > Sent: Friday, 20 September 2002 10:00 PM > To: '[EMAIL PROTECTED]' > Subject: Hardware - Operating systems > > > I am interested to know what others are using as far as hardware, and > operating systems and what kind of results people are having with their > respective setup. The largest set of images I have attempted to compress > but not yet successfully done so yet is around 20 GB. I am using a dual > Xeon 2.2 GHZ, with 2 GB of RAM and IDE hard drives. My operating system is > windows XP. > > Paul Lohr > Johnson Engineering, Inc. > 2158 Johnson St. > Fort Myers, FL 33902 > (239)-334-0046 > www.johnsongis.com > mailto:[EMAIL PROTECTED] > > > ----------------------------------------------------------- > > To make changes to your subscription, please visit our website, >http://www.ermapper.com/technicl/ermapperl/index.htm > > ----------------------------------------------------------- To make changes to your subscription, please visit our website, http://www.ermapper.com/technicl/ermapperl/index.htm
