HB17-211 SURVEY, JUNE 2017 -- USING CHIRP SONAR Survey area: Fjærlands- and Aurlandsfjorden, Sogn, Norway				UNIVERSITY OF BERGEN Department of Earth Science Allé gt. 41, N-5007 Bergen, Norway

0.1	DRAFT	-	25 August, 2017	OM	OM	-
VER.	STATUS	CHANGE	DATE	BY	CKD	APPD

INTRODUCTION

RV "Hans Brattström", Institute of Marine Research, Bergen, Norway. Link to image source.

Survey conducted in the period xx-yy June, 2017, using RV "Hans Brattström". Project leader GEO/UiB: Prof. Haflidason

Data collecting instrument: EDGETECH 3100-P SUB-BOTTOM PROFILER.

NAV DATA

Files

No.	Folder on recording laptop¹⁾	Input file	File time stamp	Script	Output file	Map sample
1	C:\DATA\2017-JUNE\HB17-211	navtrack.dat001.nav	20.06.2017, 14:22:36	Chirp-navdata-2017-processing-no-1.py	navtrack.dat001.nav.txt	Link
2	C:\DATA\2017-JUNE\	navtrack.dat002.nav	22.06.2017, 07:51:30	Chirp-navdata-2017-processing-no-2.py	navtrack.dat002.nav.txt	Link
¹⁾ Recording laptop: Dell Inspiron 9400, S/N:

Processing of Nav track data files

Sample input file: "navtrack.dat001.nav"

0  3684.4210   405.1333 165 0.0 0 7 2 48 -70.9 10    0.00 0
0  3684.4209   405.1333 248 0.0 0 7 2 50 -70.9 11    0.00 0
0  3684.4209   405.1332 218 0.0 0 7 2 52 -70.9 12    0.00 0
0  3684.4208   405.1332 281 0.0 0 7 2 54 -70.9 13    0.00 0
0  3684.4209   405.1332 271 0.0 0 7 2 56 -70.9 14    0.00 0
0  3684.4209   405.1332 258 0.0 0 7 2 58 -70.9 15    0.00 0
0  3684.4209   405.1332 271 0.0 0 7 3 0 -70.9 16    0.00 0
0  3684.4211   405.1334 61 0.0 0 7 3 2 -70.9 17    0.00 0
0  3684.4211   405.1336 24 0.0 0 7 3 4 -70.9 18    0.00 0
0  3684.4212   405.1336 46 0.0 0 7 3 6 -70.9 19    0.00 0

Python script

f = open("navtrack.dat001.nav")
print "line_number,latitude,longitude,time"
line_number = 1
for line in f:
	s = line.split()
	lat = float(s[1]) / 60.0
	lon = float(s[2]) / 60.0
	time_stamp = "%02d:%02d:%02d"   %   ( int(s[6]), int(s[7]), int(s[8]) )
	point = "%05d,%1.7f,%1.7f,%s"   %  (line_number, lat, lon, time_stamp)
	print point
	line_number += 1
f.close()

Sample output file "navtrack.dat001.nav.txt"

line_number,latitude,longitude,time
00001,61.4070167,6.7522217,07:02:48
00002,61.4070150,6.7522217,07:02:50
00003,61.4070150,6.7522200,07:02:52
00004,61.4070133,6.7522200,07:02:54
00005,61.4070150,6.7522200,07:02:56
00006,61.4070150,6.7522200,07:02:58
00007,61.4070150,6.7522200,07:03:00
00008,61.4070183,6.7522233,07:03:02
00009,61.4070183,6.7522267,07:03:04
00010,61.4070200,6.7522267,07:03:06

On-line map plots, as QC indication

It's possible to upload nav data files and get map plots in return, from this web page: http://www.gpsvisualizer.com/