[postgis-users] Modeling an ocean

pcreso at pcreso.com pcreso at pcreso.com
Thu Mar 5 17:07:57 PST 2009

Hi Dave,

I've modelled depths, hydrographic, oceanographic & hydrological data, but never the sort of thing you are talking about. The closest I've come is quantitavely modeling fishing activity, but I had start/finish data for the fishing events there.

I guess one way would to be to take something like GEBCO trackline data to work backwards from where ships typically "go". Depth based data will be very problematic in coastal areas, as where traffic is heavy & data good, ships will sail with a metre or so of clearance, and this is very tidal. In less well known areas they may require 10 to 30m of clearance.

I also know of current navigational charts where the coast is well over a mile out from reality, so even using those for data is problematic.

Can you keep in touch with any progress you make with this? As a PostGIS user in the maritime arena I'm always interested in such things...


  Brent Wood

--- On Fri, 3/6/09, David Potts <dave.potts at pinan.co.uk> wrote:

> From: David Potts <dave.potts at pinan.co.uk>
> Subject: [postgis-users] Modeling an ocean
> To: "PostGIS Users Discussion" <postgis-users at postgis.refractions.net>
> Cc: postgis-users at postgis.refractions.net
> Date: Friday, March 6, 2009, 2:27 AM
> Hi,
> I have been asked to model an Ocean by a 3rd party in terms
> of the
> possible movement patterns fo ships, has anybody got any
> suggestion on
> where to start on this issue?
> I am used to think about cost distance models, friction
> maps, nearest
> neighbour etc on land.  But an ocean is a different
> concept. Its a fluid
> mass which can change density.
> In terms of sailing its going to have areas such as
> sandbank, rocks,
> shipwreck sites etc which in terms of land movment patterns
> can be
> classified as inpassible areas,  openwater as flat land
> masses.
> Has anybody tried to do anything simalir?, any suggestions
> hints etc,
> greatly appreciated.
> Dave.
> -- 
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> individual sender,
> except where the sender specifically states them to be the
> views of the
> Pinan Software
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