Live data from Hacker News

ShipMap

shipmap.org

11–20 of 80 posts

Re: ShipMap

#12
post #8
post #3

Earlier quoted context omitted.

Canals. Figure they have probably fixed any wobbly data.

Some of the (likely) fixes look pretty weird, moving at a ridiculous speed, through land and sea in a straight line, only to reach a certain point and continue as if nothing had happened. e.g. 8 June 2012 05:00 from western Sahara to English Channel, through Sahara, right the middle of Spain, parts of France. Another on 9 May 2012 from Southeast Asia, straight through the south of India and right through the middle o…

That sounds to me like those ships are missing transponder data for some reason, and the visualisation is extrapolating between to distant data points.

Not sure why this would be the case. Transponder turned off? Data missing for other reasons?

Re: ShipMap

#13
post #8

Earlier quoted context omitted.

Some of the (likely) fixes look pretty weird, moving at a ridiculous speed, through land and sea in a straight line, only to reach a certain point and continue as if nothing had happened. e.g. 8 June 2012 05:00 from western Sahara to English Channel, through Sahara, right the middle of Spain, parts of France. Another on 9 May 2012 from Southeast Asia, straight through the south of India and right through the middle o…

That sounds to me like those ships are missing transponder data for some reason, and the visualisation is extrapolating between to distant data points. Not sure why this would be the case. Transponder turned off? Data missing for other reasons?

Quite possible.

I've never seen a perfectly clean dataset of any significant size. Big datasets have all sorts of weirdness unless there was an extraordinary effort to keep them pristine.

Re: ShipMap

#14

There are pirates (thieves, but I like Pirate better?) whom were renting luxury boats in the Mediterranean, and stealing them. They would fly to Europe, and dress like rich fancy boys. They would then rent the ships for vacation. They would take the transponder off the luxury vessel, and put it on a toy boat. The owner would check on his vessel, and it all looked fine. Meanwhile, the thieves would have the boat in Ru…

[deleted]

Re: ShipMap

#16

I see a lot of these points going over land, even where there aren't any big rivers. Maybe this is a plot of the containers rather than the ships?

[deleted]

Re: ShipMap

#17

There are pirates (thieves, but I like Pirate better?) whom were renting luxury boats in the Mediterranean, and stealing them. They would fly to Europe, and dress like rich fancy boys. They would then rent the ships for vacation. They would take the transponder off the luxury vessel, and put it on a toy boat. The owner would check on his vessel, and it all looked fine. Meanwhile, the thieves would have the boat in Ru…

Not going to lie but this sounds far more entertaining than sitting at my dining room all day making computer programs.

Re: ShipMap

#18

I see a lot of these points going over land, even where there aren't any big rivers. Maybe this is a plot of the containers rather than the ships?

What you’re witnessing is a self reported dataset from an international community (read as “unconcerned with The Protestant Work Ethic”) of ship captains and owners.

There are so many edge cases and oddities that the more you look the more you’ll find.

The moral of the story here is that you cannot accept AIS data, or any single data source, to be God’s Truth; you must always skeptical of the data before your eyes, lest you fall victim to “The Analyst’s Fallacy” (believing that the data presented is all the data there is) and create false stories in your mind.

Re: ShipMap

#20

If you click to about the middle of May and wait a few seconds, you get a ship flying across the middle of Africa. I wonder what happened there :)

There's one flying over Saudi Arabia in August, too.
Post reply on HN