[GRASSLIST:779] Re: Planning swath bathymetry surveys

[Patton, Eric]

David,

What water depths will you be working at? I ask because you can usually plan
parallel lines in deeper water where you don't have to contend with islands,
shoals, fishing gear, etc. We use Regulus software from ICAN as our nav
package for swath surveys, but all it really does is plot parallel lines of
a given length and angle orientation, (i.e. v.parallel, v.digit). For
non-parallel survey grids, we really just digitize arbitrary survey tracks.

I'm not sure if the MB-System has a survey grid making tool, maybe worth a
check: 
http://www.ldeo.columbia.edu/res/pi/MB-System/

~ Eric.


 

-----Original Message-----
From: owner-GRASSLIST at baylor.edu
To: David Finlayson
Cc: GRASSLIST at baylor.edu
Sent: 4/19/2006 11:48 PM
Subject: [GRASSLIST:773] Re: Planning swath bathymetry surveys

> Has anyone built a tool to assist in planning SWATH bathymetry surveys
> in GRASS? Alternatively, do you know of a tool that would take
> existing bathymetry as input and help me plan survey lines?

r.transect -g, r.profile -g
and make vector lines from result, then v.buffer?
That way might be fairly labor intensive without a script.
just use v.digit or QGIS digitization of lines over a DEM backdrop?

how much will depth vary? (as beam width & space between tracks will
increase with depth)

"v.mkgrid angle=" might be quite useful

Simrad setup or similar? digital out?

For old paper Sidescan Sonar recorders + GPS track the new thin plate
spline warping in gdalwarp has given me much better results than with
Caris GIS or ERDAS. A few bumps along the way but in the end a pretty
smooth process.

Someone made a good free (beer) data viewer for swath data.. can't
remember the name now :/ I'll rereply if it comes to me.

Ocean Data View isn't really what you're after, but maybe useful:
  http://odv.awi-bremerhaven.de/

Also check out Bob's Tekmap website. http://www.tekmap.ns.ca/


Hamish