Has someone switched off the Foreign Satellite Data again, or is it
just me?

Cheers,
David



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By the way: Did anybody noticed something unusual when processing

todays 15:15 HRIT scan ?

Yes, there was an HRV segment which had been trucated when
transmitted. The MSG Data Manager, despite being written with
extensive exception handling, failed to pick up this bad data, and
gave an I/O Error 103 message. There is an updated beta version of
the program available from:

http://www.satsignal.net => Software, Beta Versions

Cheers,
David

I tested the single PC setup for a couple of days (and at our 13
september meeting at utrecht).

It is possible to receive and process images simultaneously. But you
need to monitor CPU load and memory usage at every step. Either
select only a few channels in MDM or stock up your memory to 1024 Mb
or more.
Running Tellique and MDM (all channels on, HRIT and LRIT) is possible
without missing segments on a 1.8 GHz P4 with 512 Mb.
In addition I do browse the images simultaniously wit PSP.

But running Geosatsignal and animation additionally is too heavy for
the amount of memory and causes loss of missing segments, even on my
intel P4 2.4 GHz with 1024 Mb DDR memory running Windows 2000 SP3.

But a word of caution here; MSG Data stream is still being expanded
(latest addition MDD data) and other "simple" tasks should be avoided
on this PC.
Once I tried to browse a folder with over 20.000 raw data files and
had Windows explorer hanging for a couple of minutes and a lot of
missing segments afterwards !
So house keeping a single PC that runs for 24 hours a day will be a
challenge !

Greetings,
Arne van Belle

By the way: Did anybody noticed something unusual when processing
todays 15:15 HRIT scan ?




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I don't believe the Rx machine needs to be anything special, I use an Abit

sed outside of MS products.

Cheers, Guy

----- Original Message -----
From: Alan Sewards
To: MSG-1@yahoogroups.com
Sent: Monday, September 22, 2003 8:17 AM
Subject: [MSG-1] Equipment for receiving MSG-1


While John is busy collating the inputs from those who have participated

the MSG-1 dissemination trials, I thought it might be of interest to
question some of the basic assumptions. The main one of these is that

needs to have two computers, one for the reception function and one for

decoding. Because I only had one, I had to make do with it for all
functions, and in doing so I expected I would lose some of the data.
However, as time has gone on, I have begun to realise that any data that
might have been lost due to possible overload of the single computer is
insignificant compared with data lost from other sources associated with

dissemination trials. In fact, I did a test overnight where I stopped

MSG DM and then restarted it at 0500UTC, so it had about 12 hours of
captured data to process, which is does in what I call 'catch-up' mode,

is running flat out with the CPU utilization running around 80-100% on a
continuing basis. It took about two hours to process all the stored data
and, as far as I could tell by a visual inspection of the thumbnails,

were no missing segments in either the period of stored data or in data
captured during the catch-up processing. This leads me to suspect that a
single computer is all that is needed for MSG reception, provided of

that it has sufficient power. I should note here that I only collect

of the 12 HRIT channels, all the LRIT and FSD, so I do not have a full

I may try an experiment of collecting the full set and see if that makes

difference. My computer is nothing special, 1800 Athlon, with 512 MB.
Because I have had great difficulty in getting two computers running
Windows XP to network properly, I am seriously considering departing

the two-computer concept and sticking with a single one for MSG, and I

pretty confident that it will work. Anyone else had similar thoughts?

we do some serious tests to find out if two computers are really

Best regards - Alan

Alan Sewards
email: alan.sewards@computer.org
web site: http://asewards.free.fr



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My 20th images are long gone but the missing segment report

suggests that segments 7 and 8 were missing for channels 1-11 and 17-
24 were missing for the HRV channel for the 20.15 scan.

Thanks, Douglas. I understand you don't take the LRIT? By the way,
the missing segments report keeps one week of backlog data.

Cheers,
David

--- In MSG-1@yahoogroups.com, "David Taylor" <david-taylor@b...>
wrote:

Did you get any missing segments on 2003 September 20 for the 2015
cycle?

One more thing, could you give your location (general area is
enough) when writing, please? To repeat, negative reports are
equally important!

Thanks,
David