SonTek ADP - GPS Data Conversion: GADPGPS

SonTek
ADP Software Manual Version 6.42 (November 1, 2000)
19
3.5. GPS Data Conversion: GADPGPS
The program provide access to the GPS position data recorded when the real-time data collection
software is run with the “ADPSA –p” option (see sections 2.2 and 2.5 for details). Each record
extracted contains the profile number, and the universal time, latitude and longitude for the first
and last GPS message during an averaging interval. This program can only be used if GPS
position data are included in the file. The command format is as follows.
GADPGPS <ADP file> [options]
where:
• <ADP 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.
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:
GADPGPS test1 -O\data\test1 -N1:200
Will extract GPS data for the profiles 1 to 200, from file test1 and output data into a file
\data\test1.
GADPGPS generates one ASCII output file with the extension .GPS. The ASCII tabular output
file has one line per profile with 7 columns of data as described in the table below.
GADPGPS Tabular Data Output Format
Column Contents
1 Profile number in file
2 UTC time from start of profile (seconds from January 1, 1980, 00:00:00)
3 GPS Latitude from start of profile (positive for degrees North)
4 GPS Longitude from start of profile (positive for degrees East)
5 UTC time from end of profile (seconds from January 1, 1980, 00:00:00)
6 GPS Latitude from end of profile (positive for degrees North)
7 GPS Longitude from end of profile (positive for degrees East)
8 GPS East Velocity
9 GPS West Velocity
10 GPS Velocity Magnitude
11 GPS Velocity Direction