U.S. Geological Survey
2017
Text files of the navigation logged with during the sampling survey of field activity 2012-024-FA in 2012 by the U.S. Geological Survey in the Connecticut River
1.0
tabular digital data
data release
DOI:10.5066/F7PG1Q7V
Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.5066/F7PG1Q7V
https://cmgds.marine.usgs.gov/data/field-activity-data/2012-024-FA/data/navigation/2012-024-FA_SamplingNav.zip
Seth D. Ackerman
David S. Foster
Eric M. Moore
Barry J. Irwin
Dann S. Blackwood
Christopher R. Sherwood
2017
High-Resolution Geophysical and Sampling Data Collected at the Mouth of the Connecticut River, Old Saybrook to Essex, Connecticut, 2012
1.0
data release
DOI:10.5066/F7PG1Q7V
Reston, VA
U.S. Geological Survey
Suggested citation: Ackerman S.D., Foster D.S., Moore E.M., Irwin B.J., Blackwood D.S., and Sherwood, C.R., 2017, High-resolution geophysical and sampling data collected at the mouth of the Connecticut River, Old Saybrook to Essex, Connecticut, 2012: U.S. Geological Survey data release, https://doi.org/10.5066/F7PG1Q7V.
https://doi.org/10.5066/F7PG1Q7V
A geophysical and geological survey was conducted at the mouth of the Connecticut River from Old Saybrook to Essex, Connecticut, in September 2012. Approximately 230 linear kilometers of digital Chirp subbottom (seismic-reflection) and 234-kilohertz interferometric sonar (bathymetric and backscatter) data were collected along with sediment samples, riverbed photographs, and (or) video at 88 sites within the geophysical survey area. Sediment grab samples were collected at 72 of the 88 sampling sites, video was acquired at 68 sites, and photographs of the river bottom were taken at 38 sites. These survey data are used to characterize the riverbed by identifying sediment-texture and riverbed morphology. More information can be found on the web page for the Woods Hole Coastal and Marine Science Center field activity: https://cmgds.marine.usgs.gov/fan_info.php?fan=2012-024-FA. Data collected during the 2012 survey can be obtained here: https://doi.org/10.5066/F7PG1Q7V.
These raw navigation data are provided as an archive of the navigation data files acquired during the sampling portion of USGS survey 2012-024-FA in the Connecticut River. Survey 2012-024-FA was conducted aboard the R/V Rafael. These data were logged, via serial port input, at a one-second interval using Microsoft HyperTerminal on a Dell Latitude D820 laptop computer.
More information can be found on the WHCMSC Field Activity webpage: https://cmgds.marine.usgs.gov/fan_info.php?fan=2012-024-FA. Data collected during the 2012 survey can be obtained here: https://doi.org/10.5066/F7PG1Q7V.
20120921
20120923
ground condition of survey dates: 20120921-20120923
None planned
-72.4134717
-72.3349450
41.3890983
41.2650883
USGS Metadata Identifier
USGS:a3121a8d-90a2-4207-9ab1-5d0f08ba08fb
None
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Woods Hole Coastal and Marine Science Center
WHCMSC
seafloor
sea floor
Marine Geology
field activity 2012-024-FA
field activity number 12024
navigation
nav
survey line
Differential GPS
DGPS
Hemisphere DGPS
R/V Rafael
USGS Thesaurus
marine geology
navigational data
Marine Realms Information Bank (MRIB) keywords
Global Positioning System (GPS) observations
estuary
river
ISO 19115 Topic Category
oceans
elevation
location
None
North America
United States
Atlantic Ocean
Connecticut
Connecticut River
Long Island Sound
Old Saybrook
Essex
None
2012
None
These data are NOT to be used for navigation. Mariners should refer to the appropriate nautical chart. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
Seth Ackerman
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2315
508-457-2310
sackerman@usgs.gov
Some lines of navigation data may be empty or incomplete, especially at the beginning of a file when the first bits of data were being received via serial input.
These are the original files recorded during the sampling survey. These data were checked but no modifications or corrections have been made to these files.
These files represent all the navigation recorded by during the sample portion of USGS survey 2012-024-FA in the Connecticut River. Temporal and spatial gaps may occur when the navigation data was not being logged or when the GPS signal was temporarily disrupted.
Differential GPS (DGPS) navigation data were collected during the sampling portion of USGS survey 2012-024-FA using the Hemisphere DGPS which had an antenna mounted on the aft of the R/V Rafael's cabin just port of the centerline. Positioning data from this receiver were logged at a one-second interval using Microsoft HyperTerminal on a Dell Latitude D820 laptop computer via serial input. These data were incorporated into the sampling data in post-processing. The DGPS horizontal positional accuracy is estimated to be within 3-5 m.
U.S. Geological Survey
Unpublished Material
raw navigation data
text digital data
disc
20120921
20120923
ground condition of survey dates: 20120921-20120923
raw navigation data
Raw navigation data from survey 2012-024-FA were logged at a one-second interval using Microsoft HyperTerminal on a Dell Latitude D820 laptop computer. File name convention is vessel_julianday_starttime.TXT.
The raw navigation feed from the Hemisphere Differential Global Positioning System (DGPS) receiver was logged at a one-second interval using Microsoft HyperTerminal on a Dell Latitude D820 laptop computer. Log files were recorded for each survey day (by Gregorian day). The filenames are in the format of vessel_julianday_starttime.TXT. For example, filename Rafael_JD265_1702.TXT represents the navigation logged on the R/V Rafael on Julian day 265 beginning at 1702. Times are recorded in UTC (Coordinate Universal Time).
2012
Seth Ackerman
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2315
508-457-2310
sackerman@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20200908
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
point
0.000001
0.000001
Decimal degrees
D_WGS_1984
WGS_1984
6378137.000000
298.257224
Not all files contain complete NMEA strings. These are the original files, no corrections have been made to these files. The times recorded in the navigation file are in UTC. The NMEA keywords and the information they provide are as follows:
$GPGGA is GPS fix data in the format: $GPGGA, t, lat, lath, long, longh, q, sat, h, a, M, alt, M, t2, refcheck, where t=time in UTC in the format hhmmss.ss; lat=latitude in the format ddmm.mmmmmm; lath= N or S indicating the latitude hemisphere; long=longitude in the format dddmm.mmmmmm; longh=E or W indicating the hemisphere; q=fix quality where 0=fix not available or invalid; 1=GPS fix; 2=Differential GPS fix; 3=GPS PPS Mode fix; 4=RTK fix; 5=RTK float; sat=number of satellites; h=Horizontal Dilution of Precision (HDOP); a=Antenna altitude above mean sea level (geoid); M= units of antenna altitude in meters; alt=height of geoid above WGS84 ellipsoid; M=units of geoidal height in meters; t2=time since last DGPS update; refcheck=DGPS reference station id and the checksum.
Example: $GPGGA,170003.00,4119.08134,N,07221.00464,W,2,09,1.2,5.5,M,-33.8,M,6.4,0008*70 UTC Time = 170003.00 Latitude Deg = 41 Latitude Min = 19.08134 N Longitude Deg = 072 Longitude Min = 21.00464 W Fix Quality = 2 (indicates Differential GPS) Number of satellites = 09 HDOP = 1.2 relative accuracy of horizontal position Altitude = 5.5 meters above mean sea level Height of geoid above WGS84 ellipsoid = -33.8 meters Time since last update = 6.4 Checksum = 0008*70.
$GPVTG is track made good and ground speed in the format: $GPVTG, true, T, mag, M, grsp1, N, grsp2, K, mode, where t=true course made good over ground in degrees, T= True, m=magnetic course made good over ground in degrees, M=magnetic, grsp1=ground speed, N=Knots, grsp2=ground speed, K=Kilometers per hour, mode=Mode indicator (A=Autonomous, D=Differential, E=Estimated, N=Data not valid).
Example: $GPVTG,70.98,T,,M,0.09,N,0.17,K,D*01 True course made good: 340.39 Magnetic course made good: 70.98 Ground speed (knots) = 0.09 Ground speed (kilometers) = 0.17 Mode=Differential.
The definitions of the NMEA strings were obtained from: http://home.mira.net/~gnb/gps/nmea.html, http://www.nps.gov/gis/gps/NMEA_sentences.html.
Seth Ackerman
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2315
508-457-2310
sackerman@usgs.gov
USGS data release 2012-024-FA contains raw sampling navigation files collected in the Connecticut River (2012-024-FA_SamplingNav.zip). The zip file contains 4 raw navigation files that serve as a navigation archive and Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata files (2012-024-FA_SamplingNav.xml) in standard formats.
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
TEXT
none
Text file
ASCII text files containing RAW navigation data. This zip file also includes associated metadata.
Use 7zip, WinZip, Peazip, pkUnzip, Keka or other uncompressing software
1
https://cmgds.marine.usgs.gov/data/field-activity-data/2012-024-FA/data/navigation/2012-024-FA_SamplingNav.zip
https://doi.org/10.5066/F7PG1Q7V
https://cmgds.marine.usgs.gov/data/field-activity-data/2012-024-FA/
The first link is a direct link to download the zipped file of the backscatter imagery and metadata. The second and third links will both take you to the field activity data page containing all of the available data from this survey including this dataset.
none
These data are available as ASCII text files. To utilize these data, the user must have software capable of unzipping the zip file, viewing text files and parsing the navigation strings.
20200908
Seth Ackerman
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2315
508-457-2310
sackerman@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time