U.S. Geological Survey
2014
JPEG Images of chirp subbottom profiler data collected by the U.S. Geological Survey in Moultonborough Bay, Lake Winnipesaukee, New Hampshire in 2005 (JPEG Image Format)
1.0
raster digital data
data release
DOI:10.5066/F71N7Z4H
Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.5066/F71N7Z4H
https://cmgds.marine.usgs.gov/data/field-activity-data/2005-004-FA/
https://cmgds.marine.usgs.gov/data/field-activity-data/2005-004-FA/data/seismics/2005-004-FA_chimages.zip
Denny, J.F.
Danforth, W.W.
Worley, C.R.
Irwin, B.J.
2014
High-resolution geophysical and sample data collected in Moultonborough Bay, Lake Winnipesaukee, New Hampshire in 2005, USGS Field Activity 2005-004-FA
1.0
data release
DOI:10.5066/F71N7Z4H
Reston, VA
U.S. Geological Survey
https://doi.org/10.5066/F71N7Z4H
In freshwater bodies of New Hampshire, the most problematic aquatic invasive plant species is Myriophyllum heterophyllum or variable leaf water-milfoil. Once established, variable leaf water-milfoil forms dense beds that can alter the limnologic characteristics of a waterbody, impacting natural lacustrine communities and their habitats. Variable leaf water-milfoil infestations also disrupt recreational uses of waterbodies and have negatively affected swimming, boating, fishing, and property values in and around several lakes and ponds in New Hampshire.
In 1965, Moultonborough Bay, Lake Winnipesaukee became the first waterbody in New Hampshire where variable leaf water-milfoil was observed. Variable leaf water-milfoil is native to the Southeastern and Midwestern areas of the United States where more alkaline waters appear to limit the growth of this plant. Outside its native range, however, it adapts well to the relatively acidic, low-alkalinity, and nutrient-poor conditions of oligotrophic lakes and bays similar to Moultonborough Bay.
In 2005, the New Hampshire Department of Environmental Services (NHDES) collaborated with the U.S. Geological Survey to investigate the distribution (presence and density) of variable leaf water-milfoil in Moultonborough Bay. This study utilized geophysical systems and conventional water-quality measurements to identify lake-floor environments that may provide suitable habitat for the establishment and growth of variable leaf water-milfoil. The results of the study are intended to assist resource managers in federal and state agencies by providing methods for detecting variable leaf water-milfoil and for identifying areas susceptible to infestation. Ultimately, this information may lead to early detection, prevention, and more effective mitigation strategies.
Field activity information for this cruise is available on-line through the U.S. Geological Survey Coastal and Marine Geoscience Data System https://cmgds.marine.usgs.gov/fan_info.php?fa=2005-004-FA.
JPEG images of each seismic profile were generated in order to incorporate images of the seismic data into Geographic Information System (GIS) projects and data archives utilizing HTML. These JPEG images represent 37 km of chirp seismic data collected in 2005 during USGS field activity 2005-004-FA. This format is universal and yields an easily viewable image of the seismic profiles. Corresponding trackline navigation is contained within a polyline shapefile (2005-004-FA_chirptrk.shp), shot-point locations are available in a point shapefiles (2005-004-FA_chirpsht.shp).
20050726
ground condition
None planned
-71.390517
-71.361103
43.728543
43.710999
None
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Woods Hole Coastal and Marine Science Center
WHCMSC
Marine Geology
field activity number 2005-004-FA
USGS CMGP InfoBank ID R-1-05-NH
field activity number 05004
subbottom profiler
seismic
chirp
Edgetech SB-424 subbottom profiler
JPEG
R/V Rafael
ISO 19115 Topic Category
inlandWaters
geoscientificInformation
location
None
North America
United States
New Hampshire
Lake Winnipesaukee
Moultonborough Bay
None.
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.
Jane F. Denny
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
Massachusetts
02543
USA
508-548-8700 x 2311
508-457-2310
jdenny@usgs.gov
https://cmgds.marine.usgs.gov/data/field-activity-data/2005-004-FA/data/seismics/2005-004-FA_chimages_sm.jpg
Thumbnail image of chirp subbottom data collected by the U.S. Geological Survey in Moultonborough Bay, Lake Winnipesaukee, New Hampshire, 2005
JPEG
Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.1850
Denise M. Argue
Richard G. Kiah
Jane F. Denny
Jeffrey R. Deacon
William W. Danforth
Craig M. Johnston
Amy P. Smagula
2007
Relation of Lake-Floor Characteristics to the Distribution of Variable Leaf Water-Milfoil in Moultonborough Bay, Lake Winnipesaukee, New Hampshire, 2005
1.0
document
Scientific Investigations Report
2007-5125
Reston, Virginia
U.S. Geological Survey
https://pubs.usgs.gov/sir/2007/5125/
John Stockwell
2005
Seismic Un*x
document
Golden, Colorado, USA
Center for Wave Phenomena - Colorado School of Mines
http://www.cwp.mines.edu/cwpcodes/index.html
Barry, K.M.
Cavers, D.A.
Kneale, C.W.
1975
Report on recommended standards for digital tape formats
document
Geophysics
v. 40, no. 02, p. 344-352.
Houston, Texas
Society of Exploration Geophysicists (SEG)
http://www.seg.org/documents/10161/77915/seg_y_rev0.pdf
All subbottom data were collected during USGS cruise 2005-004-FA using an Edgetech SB-424 chirp subbottom profiler. Processed chirp seismic data (lines 43 - 112) were converted to JPEG format for ease of seismic trace display. Quality control was conducted during processing.
Acquired chirp seismic data (Lines 43 - 112) were processed and JPEG images produced.
Navigation was acquired with Wide Area Augmentation System ( WAAS), which is accurate to + or - 1 to 2 meters, horizontally. Navigation data were acquired with a LGBX Pro receiver and sent to Triton-Elics Delph seismic acquisition software, where Chirp sub-bottom data were recorded in Society of Exploration Geophysicists Y (SEG-Y) format (Barry and others, 1975) with DGPS logged to the SEG-Y trace headers.
The Edgetech SB-424 chirp subbottom profiler was towed near the surface, close to the R/V Rafael. The instrument was secured in this position throughout the survey. Due to this tow configuration, any layback minimal. The overall horizontal accuracy, given even a small (~ 1 meter) offset between the WAAS antenna and the tow-body, is + or - 5 meters.
U.S. Geological Survey
Unpublished Material
Raw Chirp Subbottom Data
online
20050726
ground condition of field activity
none
Chirp subbottom data were acquired with an Edgetech SB-424 chirp subbottom profiler. The SB-424 was deployed off the port side of the USGS R/V Rafael and towed close to the lake surface. Approximately 37 km of chirp subbottom data were collected.
Data were recorded at a 75-millisecond (ms) record length (1875 samples, 40 microsecond sample interval) and a 4-24 kHz sweep and were logged using Triton-Elics Delph seismic acquisition software (version 2005) in Society of Exploration Geophysicists Y (SEG-Y) format (Barry and others, 1975) with WAAS navigation logged to the SEG-Y file trace headers. Navigation in the SEGY header was stored as seconds of arc. The raw chirp SEGY contained 3 channels: raw, match-filtered, envelope detected. The envelope detected channel was used for data processing.
A C-shell script was executed using Sioseis (v. 2011.2.7) to read the raw SEG-Y file and write out a new SEG-Y file with the shots renumbered starting at 1. A second C-shell script was executed using Seismic Unix (version 4.1) to read the renumbered SEG-Y files, write a Seismic Unix format file (*.su), and extract SEG-Y trace header information, which included shot number, source x (arc seconds), source y (arc seconds), year, Julian Day, hour, minute, second (UTC). Geographic coordinates (stored in arc seconds WGS84) were converted to eastings and northings, UTM, Zone 19N, meters using proj (v. 4.7.1). Before saving the header information to a text file, the data were filtered using AWK (no version) to save only unique shot point locations. The unique shot navigation for each seismic line were then concatenated into a comma delimited (.csv) text file. The header records for the first several shots contained no navigation information, therefore the 'first' shot of the line is considered the first shot with usable data stored in the header. This was generally within the first 10 shots for the majority of lines.
(Stockwell, 2005)
Jane F. Denny performed this and all subsequent process steps.
2005
A C-Shell script using Seismic Unix (version 4.1) to read the SEG-Y files and plot the data as 8-bit gray scale Postscript files using the Seismic Unix 'psimage' algorithm was then executed. All images were created with a horizontal scale of 40 traces per inch. The profiles contain 50 milliseconds of Two-Way Travel Time within an 8-inch vertical window, yielding 6.25 milliseconds per inch. Postscript images were converted to JPEG format using the UNIX ImageMagick (version 5.5.6). The y-axis units are two-way travel time in seconds. The units of the x-axis of the images are shot numbers. The small tick marks represent 10 shot intervals, with the larger tick marks and labels at a 100 shot interval. The x-axis label indicates the USGS cruise ID and the number of shots in the seismic record.
2013
The online links to the data were updated to reflect the new server hosting the data. Additionally, other small edits could be made to the metadata, such as modifying http to https where appropriate. The metadata date (but not the metadata creator) was edited to reflect the date of these changes.
20170406
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
Raster
Jane F. Denny
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
Massachusetts
02543
USA
508-548-8700 x2311
508-457-2310
jdenny@usgs.gov
The file 2005-004-FA_chimages.zip contains the the chirp sub-bottom seismic-reflection profile JPEG images. In addition to the profile images, the zip file also contains the browse graphic (2005-004-FA_chimages_sm.jpg) and the FGDC CSDGM metadata in the following formats: XML, HTML, FAQ and text.
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.
JPEG
1.0
JPEG Image Format
Zip file containing the chirp subbottom profiler JPG Images from the Moultonborough Bay, Lake Winnipesaukee, New Hampshire survey area. This also includes associated metadata.
Use WinZip, 7zip, Peazip or pkUnzip
24
https://cmgds.marine.usgs.gov/data/field-activity-data/2005-004-FA/data/seismics/2005-004-FA_chimages.zip
https://cmgds.marine.usgs.gov/data/field-activity-data/2005-004-FA/
https://doi.org/10.5066/F71N7Z4H
Data can be downloaded via the World Wide Web (WWW)
none
This zip file contains data available in JPEG format. The zip file also contains associated metadata.
20170406
Jane F. Denny
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
Massachusetts
02543
USA
508-548-8700 x2311
508-457-2310
jdenny@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time