Hi David
The geocoding map to map transformation error occurs on the images of 1.1GB. It works
perfectly fine on images around 800MB.
It appears to me ERM either is not recognising the swap space or not demanding memory.
I noticed in the performance window of the task manager that when you hit ok tab of
geocoding wizard, there is no demand or increase in memory usage. In fact it hardly
uses 10-20% of available memory.
I tried increasing swap space to 4GB (min & max) to various combinations from 500MB
minimum to 4GB maximum but without success.
Hope to see solution/patch soon from you.
Regards
==============================================================
Mustak Shaikh
Remote Sensing Analyst Ph: +61-2-9895 7446
Dept of Land & Water Conservation Fx: +61-2-9895 7742
10 Valentine Avenue Email: [EMAIL PROTECTED]
Parramatta NSW 2150. Australia http://www.dlwc.nsw.gov.au
==============================================================
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>>> [EMAIL PROTECTED] 08/09 6:25 pm >>>
Mustak,
In addition to what David Carter wrote, you might find the
following useful. It's written for Windows 2000, but applies
equally for Windows NT4.
--------- ---------
The Windows 2000 (32-bit) operating system imposes a 4Gb restriction on the
amount of virtual memory that can be used by each process. (For reference
see
http://www.smartcomputing.com/editorial/article.asp?article=Articles%2FArchi
ve%2FG0801%2F33x01%2F63g01%2Easp .)
During rectification, ER Mapper needs to hold the input and output files in
virtual memory. (You can see the output size on the last page of the
Geocoding wizard). Typically the output size is similar to the input file
size, or slightly larger. So for a typical rectification, the dataset must
be smaller than ~2Gb.
Further. . .
The virtual memory space required during rectification has to be contiguous
(unbroken/continuous). Virtual memory is also used by other applications and
the operating system itself, and any other parts of ER Mapper that are
running. So even if you have lots of free virtual memory, you might not have
a sufficiently large contiguous chunk. It may help to restart the PC just
before rectification, to clear sections used by other applications. Further
complications arise if the virtual memory is divided into pieces on
different hard disks. This contiguity-requirement may effectively reduce the
allowable input size even further, below 2Gb.
Below are the possible work arounds (all of which involve making the files
smaller):
1. Reduce the number of bands in the output file. (Then re-attach
later via a VDS.) This is often the best work-around, if you have a
multi-band dataset.
2. Increase the output cell size.
3. Reduce the datatype size (eg unsigned16bit instead of IEEE4).
4. Cut the INPUT file into tiles.
5. Use "Output Extents" functionality to limit the area to output to.
(Then combine the results from multiple warps using the raster merge
function.)
This is done from the last page of the Geocoding wizard.
--------- ---------
Cheers,
Andrew.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of david.carter
Sent: Thursday, 9 August 2001 10:31 AM
To: [EMAIL PROTECTED]
Subject: RE: Low Virtual Memory
Hi Mustak,
The same problem has been recently reported by two other clients and is
logged in our bug tracking database(bugref 3618). I have done some tests
here, and found the problem exists in both ER Mapper 6.1 and 6.2 when
rectifying large datasets. The dataset I attempted to rectify was 2.4 GB.
I am currently trying to pinpoint how large a dataset must be before this
error occurs.
I will keep you updated with further findings,
David Carter
QA Officer - ER Mapper
Earth Resource Mapping
Introducing Raster and Vector Integration
Image Web Server 1.6 Released
www.EarthEtc.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Mustak Shaikh
Sent: Thursday, 9 August 2001 8:10 AM
To: [EMAIL PROTECTED]
Subject: Re:Low Virtual Memory
Hi
We are getting following error message while running geocoding wizard's map
to map reprojection.
"Could not map file sydney.ers. System is running low on virtual memory.
Increase your swap space size. Last system error = 2. No such file or
directory".
The original image is 1.1GB in size and we are trying to reproject it to
another projection/datum. We have increased our virtual memory from 523MB
(recommended) maximum to 3GB but still getting same error.
We are running ERM6.2 with WinNT (Version4.0 Patch5.0) on Pentium-III 866
twin processors with 512 RAM and two hard disks (8GB and 320GB).
Thanks for your help.
mustak
==============================================================
Mustak Shaikh
Remote Sensing Analyst Ph: +61-2-9895 7446
Dept of Land & Water Conservation Fx: +61-2-9895 7742
10 Valentine Avenue Email:
[EMAIL PROTECTED]
Parramatta NSW 2150. Australia http://www.dlwc.nsw.gov.au
==============================================================
Disclaimer
This message is intended for the addressee named and may contain
confidential/privileged information.
If you are not the intended recipient, please delete it and notify the
sender. Views expressed in this
message are those of the individual sender, and are not necessarily the
views of the NSW Department of
Land and Water Conservation. You should scan any attached files for
viruses.
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