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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: GISList: GIS/SCADA |
| Date: |
08/08/2002 06:26:53 AM |
| From: |
Pat Waggaman |
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Anthony,
Marimsys is principally a small data message "machine to machine" Orbcomm=
=20
satellite data provider. Most of the traffic is transferring the position=
=20
of several hundred mobiles (ships & trucks) to their owners and in the case=
=20
of fishing vessels - to the Chilean VMS (Vessel Monitoring System).
Systems are also used to bring in data to our servers (water temp, fuel=20
flow, PH, salinity, fishing species / quality / quantity) where we then=20
rebroadcast that to other interested parties. This is a GIS system in that=
=20
it dynamically positions all mobiles on our proprietary (VB based) plotter=
=20
/ control system, and the majority of commands are emitted (and data=20
viewed) through a right button click on the mobile (or for that matter=20
stationary) icon representing the remote satellite communicator.
Either the client or we activate (from the network) various devices=20
connected to satellite communicators on the satellite WAN.
G.S. Rao in the previous posting used VSAT (minimum bandwidth 64 Kb) for=20
the Mumbai water control project, it was probably a pre-existing system to=
=20
which he could add a bit of traffic. I would bet that the same data=20
transfer could have been done with small data messages on Orbcomm rather=20
than this wide bandwidth / high cost alternative. India lacks a=20
downloading Gateway and traffic would have had to be in "store-and-forward"=
=20
mode, which would have added 1/2 to 1 hour of report delay. There are a=20
variety of methods to hyper-compress specialized SCADA / positioning / data=
=20
report traffic which bring the low-cost & small bandwidth satellite=20
communicators into many reporting / command / control applications.
Pat
Thos. E. Waggaman, III (Pat)
Director
Marine Imaging Systems S.A.
Ave Borgo=F1o 22.090
Caleta Higuerillas
Vina del Mar
Chile
waggaman@marimsys.com
Tel: 56 32 815005
FAX: 56 32 815243
http://www.marimsys.com
At 03:30 PM 8/7/2002, you wrote:
>I'm looking for information on SCADA, anyone have recommendations on
>websites, industry groups, particular companies, specialized job/resume
>boards, etc. Basically, anything to do with the technology/industry,
>particularly as it involves GIS in some form. Thanks in advance.
>
>Anthony
>
>
>
>
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