[Acoustics] Replacing filtered ADV data

[David Velasco]

Keith

The US Geological Survey has created a software for processing data from
SonTek's Hydra ADV's, which are the autonomous versions of the ADV.  The
software is MATLAB-based and is called HydraTools.  You can get it here:
http://pubs.usgs.gov/of/2005/1026.  The Hydra data structure is
different than the structure of data collected by a RealTime (e.g. lab)
ADV, so you cannot pump your data (.adv files) through HydraTools
directly, but perhaps you can learn some tips from how they do it and
then apply to your data--they do have data flagging and removal
routines, but I'm not sure if they do interpolation.

Good luck,

-Dave

==========================
David W. Velasco
SonTek/YSI, Inc.
9940 Summers Ridge Road
San Diego, CA  92121
(t) 858.546.8327
(f) 858.546.8150
www.sontek.com
dvelasco at sontek.com


-----Original Message-----
From: acoustics-bounces at simon.er.usgs.gov
[mailto:acoustics-bounces at simon.er.usgs.gov] On Behalf Of Richardson K.
Sent: Friday, May 30, 2008 3:17 AM
To: 'acoustics at simon.er.usgs.gov'
Subject: [Acoustics] Replacing filtered ADV data

Dear All,

I am involved in a turbulence study using ADV data. We are going to be
filtering the data for spikes, low correlation and low SNR and then
replacing the filtered data with cubic polynomial interpolation through
12 points on either side of the filtered points, as suggested by Goring
& Nikora 2002 ("Despiking acoustic Doppler velocimeter data", Journal of
Hydraulic Engineering, Vol 128, p.117-126).  I would be very interested
to find out if there is any open access software available for data
replacement using this method. WinADV has a filtering routine, but does
not allow the user to replace the filtered data.

Many thanks.

Dr. Keith Richardson
RCUK Academic Fellow

School of Geography
University of Southampton
Highfield
Southampton
SO17 1BJ
United Kingdom

Tel. +44 (0) 2380 599223
Fax  +44 (0) 2380 593295



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