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high traffic AIS logs
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10-11-2015, 21:31
#
1
seandepagnier
Registered User
Join Date: Aug 2009
Location: oriental
Boat: crowther trimaran 33
Posts: 4,422
high traffic AIS logs
I have been informed that on very slow
computers
,
opencpn
becomes unresponsive rendering hundreds of
AIS
targets. I was hoping someone could post a log with lots of vessels (preferably more than 100) all moving at the same time so that I can investigate it.
From looking at the code, the
ais
rendering is no where near efficient for calculations or opengl, so I know I can do much better but I need to profile to under realistic conditions.
10-11-2015, 23:18
#
2
Muckle Flugga
Registered User
Join Date: Apr 2008
Location: Aboard the Ocean wave
Boat: 55' sloop.
Posts: 1,426
Re: high traffic AIS logs
Quote:
Originally Posted by
boat_alexandra
I have been informed that on very slow
computers
,
opencpn
becomes unresponsive rendering hundreds of AIS targets. I was hoping someone could post a log with lots of vessels (preferably more than 100) all moving at the same time so that I can investigate it.
From looking at the code, the ais rendering is no where near efficient for calculations or opengl, so I know I can do much better but I need to profile to under realistic conditions.
Only obliquely related and you are more of a computer techie than I, but some dedicated sets also have issues. Vesper Marine's Watchmate
engine
craps out at around 200 targets, which renders it close to useless in areas like the
Singapore
Straits. Perhaps a similar issue for opencpn.
__________________
‘Structural engineering is the art of modeling materials we do not wholly understand into shapes we cannot precisely analyse as to withstand forces we cannot properly assess in such a way that the public at large has no reason to suspect the extent of our ignorance.’
11-11-2015, 00:16
#
3
rgleason
Registered User
Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 17,711
Images:
2
Re: high traffic AIS logs
Sean
I've been trying to save many of the
nmea
files uploaded and some others. Not sure if any have that great a density, but they are in opencpn beta file thing rguser rgpass under
nmea
.
If anyone has such a file I can tell them how to upload it.
11-11-2015, 22:54
#
4
Hakan
Registered User
Join Date: Nov 2012
Location: Orust Sweden
Boat: Najad 34
Posts: 4,245
Re: high traffic AIS logs
Sean..
re: "
I was hoping someone could post a log with lots of vessels (preferably more than 100) all moving at the same time so that I can investigate it
"
Could you use a VDR file where nav data is from a
network
VDR replay and AIS targets from Marinetraffic? The AIS target are some 3-500 but all are of course not moving the at the same time.
If this double simulation could do it's here:
https://dl.dropboxusercontent.com/u/5209364/AIS_test
Håkan
12-11-2015, 00:24
#
5
conachair
cruiser
Join Date: Nov 2007
Location: Probably in an anchorage or a boatyard..
Boat: Ebbtide 33' steel cutter
Posts: 5,030
Re: high traffic AIS logs
Quote:
Originally Posted by
Hakan
Sean..
re: "
I was hoping someone could post a log with lots of vessels (preferably more than 100) all moving at the same time so that I can investigate it
"
Could you use a VDR file where nav data is from a
network
VDR replay and AIS targets from Marinetraffic? The AIS target are some 3-500 but all are of course not moving the at the same time.
If this double simulation could do it's here:
https://dl.dropboxusercontent.com/u/5209364/AIS_test
Håkan
How did you get the data out of
marine
traffic?
Very slight drift, but a couple of nights ago I was playing around with an arduino pretending to be a
GPS
. Making AIS sentences looks like some bit bashing beyond my meager skills but I might try outputting that data and see what happens to O.
Ta
12-11-2015, 00:51
#
6
Hakan
Registered User
Join Date: Nov 2012
Location: Orust Sweden
Boat: Najad 34
Posts: 4,245
Re: high traffic AIS logs
Ta..
re: How did you get the data out of
marine
traffic?
The VDR
plugin
can
record
whatever comes in to O. My sources was:
- A VDR replay of nav-data in a portable instance of O out to the local net as UDP.
- Marinetraffic data from a TCP IP on the net.
Is this an answer for your Q or did I misunderstood?
Håkan
12-11-2015, 01:25
#
7
conachair
cruiser
Join Date: Nov 2007
Location: Probably in an anchorage or a boatyard..
Boat: Ebbtide 33' steel cutter
Posts: 5,030
Re: high traffic AIS logs
Quote:
Originally Posted by
Hakan
Ta..
re: How did you get the data out of
marine
traffic?
The VDR
plugin
can
record
whatever comes in to O. My sources was:
- A VDR replay of nav-data in a portable instance of O out to the local net as UDP.
- Marinetraffic data from a TCP IP on the net.
Is this an answer for your Q or did I misunderstood?
Håkan
Answers it perfectly thanks. I wasn't aware you could get
marine
traffic data direct from a TCP IP online, can anyone do that or is it subscription?
13-11-2015, 00:44
#
8
Hakan
Registered User
Join Date: Nov 2012
Location: Orust Sweden
Boat: Najad 34
Posts: 4,245
Re: high traffic AIS logs
cona...
Read more here for details:
http://www.cruisersforum.com/forums/...ml#post1941923
Håkan
14-11-2015, 08:32
#
9
LeaseOnLife
Registered User
Join Date: Apr 2008
Location: out cruising again, currently in Fiji
Boat: Sailboat
Posts: 1,469
Re: high traffic AIS logs
Quote:
Originally Posted by
boat_alexandra
I have been informed that on very slow computers, opencpn becomes unresponsive rendering hundreds of AIS targets. I was hoping someone could post a log with lots of vessels (preferably more than 100) all moving at the same time so that I can investigate it.
From looking at the code, the ais rendering is no where near efficient for calculations or opengl, so I know I can do much better but I need to profile to under realistic conditions.
Sean
in case you have
internet
in R-Bay, try an
internet
AIS feed. I searched all morning for a working one, but only found this one, needs 'phantomjs' to scrape a webpage from SCOOS.org:
http://www.cruisersforum.com/forums/...et-150678.html
I currently see ~400 targets via this feed.
Dirk
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