Bratton, John F. , and Cross, VeeAnn A. , 2012, RESGPSPNTS_GSBAY.SHP: Navigation, bathymetry, and water temperature points of ship position during continuous resistivity profile data collection by the U.S. Geological Survey in Great South Bay on Long Island, New York, in May and September 2008.: Open-File Report 2011-1040, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.This is part of the following larger work.Online Links:
- <https://pubs.usgs.gov/of/2011/1040/data/navigation/resgpspnts_gsbay.zip>
- <https://pubs.usgs.gov/of/2011/1040/html/catalog.html>
Cross, V.A., Bratton, J.F., Kroeger, K.D., Crusius, J., and Worley, C.R., 2012, Continuous Resistivity Profiling Data from Great South Bay, Long Island, New York: Open-File Report 2011-1040, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_1984.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257224.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
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.
| Range of values | |
|---|---|
| Minimum: | -73.2509 |
| Maximum: | -72.872283 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | 40.64225 |
| Maximum: | 40.759267 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | 0.2 |
| Maximum: | 347.2 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 13.2 |
| Maximum: | 21.2 |
| Units: | degrees Celsius |
Character set.
Character set.
Character set. Two streamers were used during the surveys - a 15 meter and 50 meter. This field allows quick identification of each.
| Range of values | |
|---|---|
| Minimum: | 140 |
| Maximum: | 269 |
| Units: | day |
Character set.
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The purpose of this point shapefile is to provide the ship's position, bathymetric values, and water temperature during the collection of continuous resistivity profile data in Great South Bay on southern Long Island, New York. These data cover two cruises: May 19 to May 22, 2008 and Sept. 22 to Sept. 25, 2008.
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
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 "dogps" - shell script run under CYGWIN (UNIX like environment that runs under Windows). This is the script used for the May 19 (day 8) data collection:
files=`ls *.gps | cut -d. -f1` files=`ls *.gps | cut -d. -f1` for file in $files do awk -f awkhold $file.gps $file >> day8gps.txt doneThe script not only parses the GPS navigation, but concatenates the results into a single file. This script was repeated for days 9, 10, and 11 (May 20, May 21 and May 22 respectively) with the output directed to day9gps.txt, day10gps.txt, and day11gps.txt. For the September cruise, the output files were sept2208gps.txt, sept2308gps.txt, sept2408gps.txt and sept2508gps.txt.
The attributes were checked to see that they agreed with the input data. However, for the depth field (depth_m), it is assumed that depths greater than 10 are erroneous values - although these values were not removed from the file.
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. For the data collected in May of 2008, the fathometer was mounted port side aft, directly below the GPS antenna and the resistivity streamer tow point. For the data collected in September of 2008, the fathometer was mounted starboard side aft, directly below the GPS antenna and the resistivity streamer tow point. The transducer was approximately 0.30 meters below the sea surface, and this draft was not corrected for. 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.
All GPS files acquired as part of the CRP data collection were processed to generate this point shapefile.
No duplicate points are present. The navigational fixes were checked for valid values and invalid locations were deleted. No other checks were performed. However, it is assumed that depth_m values greater than 10 are erroneous.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None.
- Use_Constraints:
- 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.
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
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.
| Data format: | This WinZip file contains the point shapefile as well as the associated metadata files. in format WinZip (version 9.0) Size: 672 KB |
|---|---|
| Network links: |
<https://pubs.usgs.gov/of/2011/1040/data/navigation/resgpspnts_gsbay.zip> <https://pubs.usgs.gov/of/2011/1040/> |
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.
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov