John F. Bratton
VeeAnn A. Cross
2011
Navigation and Bathymetry Points of Ship Position During Continuous Resistivity Profile Data Collection in the Corsica River Estuary, Maryland on May 17, 2007 on USGS Cruise 07005 f(RESGPSPNTS_JD137.SHP)
vector digital data
Open-File Report
2010-1094
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.3133/ofr20101094
https://pubs.usgs.gov/of/2010/1094/html/catalog.html
https://pubs.usgs.gov/of/2010/1094/data/navigation/resgpspnts_jd137.zip
VeeAnn A. Cross
John F. Bratton
Charles R. Worley
John Crusius
Kevin D. Kroeger
2011
Continuous resistivity profiling data from the Corsica River Estuary, Maryland
Open-File Report
2010-1094
Reston, VA
U.S. Geological Survey
https://pubs.usgs.gov/of/2010/1094/
Submarine groundwater discharge (SGD) into Maryland's Corsica River Estuary was investigated as part of a larger study to determine the importance of nutrient delivery to Chesapeake Bay via this pathway. Resource managers are concerned about nutrients that are entering the estuary via submarine groundwater discharge from this primarily agricultural watershed that may be contributing to eutrophication, harmful algal blooms, and fish kills. An interdisciplinary U.S. Geological Survey (USGS) science team conducted field operations in the estuary in April and May 2007. Techniques used included continuous resistivity profiling (CRP), piezometer sampling, seepage meter measurements, and collection of a radon tracer time series. Better understanding of the style, locations, and rates of groundwater discharge could lead to improved models and mitigation strategies for estuarine nutrient over-enrichment in the Corsica River Estuary, and other similar settings. More information on the field work can be accessed from the Woods Hole Coastal and Marine Science Center Field Activity webpage: https://cmgds.marine.usgs.gov/fan_info.php?fan=2007-005-FA.
The purpose of this point shapefile is to provide the ship's position and bathymetric values (when available) during the collection of continuous resistivity profile data in the Corsica River Estuary, Maryland on May 17, 2007.
20070517
ground condition
None planned
-76.149917
-76.108067
39.086267
39.074783
USGS Metadata Identifier
USGS:848e3d3f-da0b-4016-972e-cc180ca53134
None
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Woods Hole Coastal and Marine Science Center
WHCMSC
Field Activity Serial Number 07005
Field Activity Number 2007-005-FA
Info Bank ID T-1-07-CH
navigation
bathymetry
point
shapefile
Continuous Resistivity Profiling
CRP
Lowrance GPS
R/V Terrapin
ISO 19115 Topic Category
elevation
inlandWaters
location
oceans
USGS Thesaurus
navigational data
bathymetry
geospatial datasets
None
North America
North Atlantic
United States
Maryland
Corsica River Estuary
Chesapeake Bay
None.
The 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.
John F. Bratton
U.S. Geological Survey
mailing and physical address
Woods Hole Coastal and Marine Science Center
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700 x2254
(508) 457-2310
jbratton@usgs.gov
Current address:
NOAA/GLERL
4840 S. State Rd.
Ann Arbor MI 48108-9719
734-741-2235
John.Bratton@noaa.gov
https://pubs.usgs.gov/of/2010/1094/data/navigation/resgpspnts_jd137.gif
Thumbnail image showing the location of resistivity navigation points collected May 17, 2007. The coastline is included for spatial reference.
GIF
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500
No duplicate points are present. The navigational fixes were checked for valid values. Invalid data points were deleted. No other checks were performed.
All available navigation, bathymetry and temperature information available on this day is included in the dataset.
The navigation system used was a Lowrance 480M with an LGC-2000 Global Positioning System (GPS) antenna. The antenna was located at the anchor point for the resistivity streamer, which is also directly above the fathometer transducer mount point. The GPS system is published to be accurate to within 10 meters.
All collected bathymetry values were collected by the 200 kHz Lowrance fathometer. The fathometer was mounted starboard side aft, directly below the GPS antenna and the resistivity streamer tow point. The Lowrance manufacturer indicates the speed of sound used by the system to convert to depths is 4800 feet/second. All values are assumed to be accurate to within 1 meter.
The continuous resistivity profile (CRP) system used on this cruise was an AGI SuperSting marine system described at the website: www.agiusa.com/marinesystem.shtml. The particular system used for this acquisition was a 50-m streamer with an 11 electrode array with electrodes spaced 5 meters apart. The source electrodes are graphite, while the receiver electrodes are stainless steel. A dipole-dipole configuration was used for the data collection in which two fixed current electrodes are assigned with the measurement of voltage potential between electrode pairs in the remaining electrodes. The maximum depth below the water surface the streamer can reach is approximately ΒΌ the streamer length. So for the 50-m streamer, maximum depth is about 12.5 meters. Each line of data acquisition records several files. The two files necessary for processing are the *.stg and the *.gps file. The STG file contains the resistivity data, while the GPS file contains the navigation information. The navigation system used in concert with the CRP system is a Lowrance LMS-480M with an LGC-2000 GPS antenna and a 200 kHz fathometer transducer. The transducer also contains a temperature sensor. Lowrance indicates the speed of sound used by the system is 4800 feet/second. Both the temperature and depth information are recorded in the logged GPS file. There are instances where no depth or temperature information is recorded due to an equipment problem. The CRP system images the subsurface electrical properties of an estuarine, riverine or lacustrine environment. Resistivity differences can be attributed to subsurface geology (conductive vs less conductive layers) and hydrogeologic conditions with fresh water exhibiting high resistivity and saline conditions showing low resistivity.
2007
The data were transferred from the logging computer via AGISSAdmin software version 1.3.2.165. The data files available for this day are L37F1*, L38F1*, L39F1*, L39F2*, L40F1*, L41F1*, L42F1*, L43F1*, L44F1*, L45F1*, L46F1*, L47F1*, L48F1*, L49F1*, L49F2*, L50F1*, L51F1*, L52F1*, L53F1*, L54F1*, L54F2*, L55F1*, L55F2*, L56F1*, L57F1*, L58F1*, l58F2*, L59F1*, L60F1*, L61F1*, L62F1*, L63F1*, L64F1*, L65F1*, L66F1*, L67F1*, L68F1*, L69F1*, L70F1*, L71F1*, L72F1*, L73F1*, L74F1*, L75F1*. These files were then transferred via a thumb drive to the processing computer. The files included in this publication are the *.crs, *.cmd, *.gps, and *.stg. The two files essential for processing are the GPS and STG files. The GPS file contains the navigation, and in the case of the Lowrance system also includes water depth and temperature. The STG file contains the resistivity measurements from each of the electrodes. The CRS file contains the contact resistance readings. The CMD file contains the parameters for data collection. These last two files aren't necessary for data processing, but can be useful in terms of troubleshooting. This process step, along with all subsequent process steps, was performed by the same person: VeeAnn A. Cross
2007
VeeAnn A. Cross
U.S. Geological Survey
Marine Geologist
mailing and physical address
Woods Hole Coastal and Marine Science Center
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700 x2251
(508) 457-2310
vatnipp@usgs.gov
An AWK script was used to extract the navigation, Bathymetry, and temperature information recorded in each individual GPS data file. (* refers to the line name, which for this day are L37F1, L38F1, L39F1, L39F2, L40F1, L41F1, L42F1, L43F1, L44F1, L45F1, L46F1, L47F1, L48F1, L49F1, L49F2, L50F1, L51F1, L52F1, L53F1, L54F1, L54F2, L55F1, L55F2, L56F1, L57F1, L58F1, l58F2, L59F1, L60F1, L61F1, L62F1, L63F1, L64F1, L65F1, L66F1, L67F1, L68F1, L69F1, L70F1, L71F1, L72F1, L73F1, L74F1, L75F1.) The awk script from May 16th that was able to handle all problems was used on this day's data.
>AWK script "awkhold":
>BEGIN {
>FS = ","
>}
>{
>FS = ","
>ARGC = 2
>depth = -9999
>temp = -9999
>if ($1=="$GPRMC")
> {
> utctime = $2
> latdeg = substr($4,1,2)
> latmin = substr($4,3,6)
> declat = latdeg + (latmin/60)
> londeg = substr($6,1,3)
> lonmin = substr($6,4,6)
> declon = -1 * (londeg + (lonmin/60))
> if (NR==1) {
> holddepth = -9999
> holdtemp = -9999
> }
> else {
> printf("%s, %9.6f, %9.6f, %5.1f, %5.1f, %s\n", holdutctime, holddeclon, holddeclat, holddepth, holdtemp, ARGV[2])
> }
> holdutctime = utctime
> holddeclon = declon
> holddeclat = declat
> holddepth = -9999
> holdtemp = -9999
> }
>if ($1=="$SDDPT")
> {
> depthreal = $2
> holddepth = depthreal
> }
>if ($1=="$SDMTW")
> {
> tempreal = $2
> holdtemp = tempreal
> }
>}
>END {
>printf("%s, %9.6f, %9.6f, %5.1f, %5.1f, %s\n", holdutctime, holddeclon, holddeclat, holddepth, holdtemp, ARGV[2])
>}
This AWK script was initialized by "dohold" - shell script run under CYGWIN (UNIX like environment that runs under Windows):
>files=`ls *.gps | cut -d. -f1 | tr "[A-Z"] ["a-z"]`
>for file in $files
>do
> awk -f awkhold $file.gps $file > $file.holds
>done
*.gps
2007
*.holds
These files were then appended to each other using the UNIX cat command. cat l37f1.holds l38f1.holds l39f1.holds l39f2.holds l40f1.holds l41f1.holds l42f1.holds l43f1.holds l44f1.holds l45f1.holds l46f1.holds l47f1.holds l48f1.holds l49f1.holds l49f2.holds l50f1.holds l51f1.holds l52f1.holds l53f1.holds l54f1.holds l54f2.holds l55f1.holds l55f2.holds l56f1.holds l57f1.holds l58f1.holds l58f2.holds l59f1.holds l60f1.holds l61f1.holds l62f1.holds l63f1.holds l64f1.holds l65f1.holds l66f1.holds l67f1.holds l68f1.holds l69f1.holds l70f1.holds l71f1.holds l72f1.holds l73f1.holds l74f1.holds l75f1.holds > day3holds.txt
*.holds
2007
day3holds.txt
VI under CYGWIN was used to add the appropriate header line and the comma-delimited text file was imported to ArcMap 9.1: Tools - Add XY Data. The X field is longitude; Y field is latitude, and the Coordinate System was defined as Geographic, NAD83. This "Event Theme" was converted to a shapefile by right-mouse clicking on the layer - Data - Export Data. The output was saved as day3gps.shp
day3holds.txt
2007
day3gps.shp
Visual inspection of the shapefile indicated that the navigation was fine and needed no editing.
day3gps.shp
2007
day3gps.shp
Within ArcCatalog 9.2 the shapefile was copied to a new file with the name resgpspnts_jd137.shp.
day3gps.shp
200911
resgpspnts_jd137.shp
Using ArcMap 9.2 added the attributes "gps_src' and "bathy_src" to be consistent with previously published data in cases where other sources were used for navigation and/or bathymetry.
resgpspnts_jd137.shp
200911
resgpspnts_jd137.shp
Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Attempted to modify http to https where appropriate. Reordered the links in the identification section to have a landing page link as the first link. Updated the link to the field activity. Moved the minimal source information provided to make it the first process step. The distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.
20171018
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
USGS Thesaurus keywords added to the keyword section.
20180720
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
Crossref DOI link was added as the first link in the metadata.
20191118
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
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
Vector
Entity point
3073
0.000001
0.000001
Decimal degrees
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
Local surface
0.1
meters
Explicit depth coordinate included with horizontal coordinates
resgpspnts_jd137
ESRI point shapefile
ESRI
FID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
gpstime
GPS time in the format HHMMSS. GPS time is +4 from local time during the survey.
U.S. Geological Survey
Although the value is represented as a number, the number as a whole doesn't have a particular meaning. Only when the individual parts for hours, minutes, and seconds are broken out does the number have meaning.
longitude
Longitude coordinate of the point in decimal degrees, NAD83.
U.S. Geological Survey
-76.149917
-76.108067
decimal degrees
latitude
Latitude coordinate of the point in decimal degrees, NAD83.
U.S. Geological Survey
39.074783
39.086267
decimal degrees
depth_m
Depth of the water below the fathometer in meters recorded by the ship's fathometer/navigation system. Datum is local surface (no tides taken into account). A value of -9999 indicates no data.
U.S. Geological Survey
0.2
5
meters
temp_c
Water temperature in degrees Celsius as recorded at the Lowrance fathometer transducer. A value of -9999 indicated no data.
U.S. Geological Survey
20.6
24.5
degrees Celsius
line
The alphanumeric name corresponding to the prefix of the GPS filename. This name reflects the name assigned to the line of data acquisition and incorporates modifiers to reflect modification of the GPS file if the GPS file was split into more than one part.
U.S. Geological Survey
Character set.
jday
This number represents the Julian day of data collection based on the GPS day. Julian day is the integer number representing the interval of time in days since January 1 of the year.
U.S. Geological Survey
137
137
days
gpsdate
The date recorded in the GPS navigation in the format DDMMYY. Because of the time offset from local time, this date could actually be different than the local acquisition date.
U.S. Geological Survey
Character set.
gps_src
The system from which the navigation point was derived.
U.S. Geological Survey
Character set.
bathy_src
The system from which the bathymetric value was acquired.
U.S. Geological Survey
Character set.
VeeAnn A. Cross
U.S. Geological Survey
Marine Geologist
mailing and physical address
Woods Hole Coastal and Marine Science Center
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700 x2251
(508) 457-2310
vatnipp@usgs.gov
Downloadable Data
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.
Shapefile
ArcGIS 9.2
This WinZip (version 9.0) file contains the point shapefile as well as the associated metadata files.
0.136
https://pubs.usgs.gov/of/2010/1094/html/catalog.html
https://pubs.usgs.gov/of/2010/1094/data/navigation/resgpspnts_jd137.zip
DVD-ROM
4.75
GBytes
UDF
none
This WinZip file contains data available in ESRI point shapefile format. The user must have software capable of uncompressing the WinZip file and reading/displaying the shapefile.
20240318
VeeAnn A. Cross
U.S. Geological Survey
Marine Geologist
mailing and physical address
Woods Hole Coastal and Marine Science Center
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700 x2251
(508) 457-2310
whsc_data_contact@usgs.gov
The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240318)
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time