SonTek ADP - Velocity Data Conversion: GADPVEL

SonTek
ADP Software Manual Version 6.42 (November 1, 2000)
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If ADP signal strength is being used to estimate sediment concentration, raw signal strength data
from GADPAMP should be used rather than SNR, since the latter includes information about the
instrument noise level, which may change with time. Further references on the use of ADP data
for monitoring sediment concentration are available upon request.
For more information about how to use each type of ADP data, see the ADP Principles of
Operation.
3.4. Velocity Data Conversion: GADPVEL
This program extracts velocity data from an ADP data file and writes them to an ASCII file in
tabular format. GADPVEL creates files with extensions ".V1", ".V2", and ".V3" corresponding
to velocity components based upon the coordinate system selected (Beams 1, 2, and 3 / Vx, Vy,
and Vz / VEast, VNorth, and VUp). The command syntax is as follows.
GADPGPS <ADP file> [options]
where:
• <ADP data file> is the name of an ADP binary data file (no extension).
[options] is one or more of the following optional parameters:
• <-Oname> Name of output file (no extension). Defaults to input file name.
• <-Nj:k> Extracts profiles numbered j to k. Default is all profiles.
• <-Mddd.d> Magnetic declination. Default is MagDecl stored with data. (Note: only the
real-time program allows the inclusion of magnetic declination).
• <-Ccoordsys> Change output coordinates to XYZ (-CXYZ) or ENU (-CENY). Default is
to output data in whatever coordinates they were collected.
• <-AAbsVel> Convert to absolute velocities relative to GPS (-AGPS) or to bottom (-
ABOT). Default is to output velocities relative to ADP. Note: Absolute
velocities relative to GPS can only be used in the ENU system.
• <-SPDR> Output velocities as magnitude and direction.
File names must be given without extension. The program assumes that the ADP data file has
extension .ADP. If no output file name is specified, the program uses the same name as the ADP
data file. Specifying the first and last profile permits the user to extract a subset of the data. If
they are not specified, the program extracts all profiles in the file.
Example:
GADPVEL test1 -O\data\test1 -M11.3 -N1:200 -CENU –AGPS
will extract velocity profiles 1 to 200, from file test1 and output velocity relative to GPS into a
file \data\test1 using magnetic variation of 11.3°, in ENU coordinates.