Bratton, John F. , and Cross, VeeAnn A. , 2011, RESGPSPNTS_NORTHPORT.SHP: Navigation, bathymetry, and water temperature points of ship position during continuous resistivity profile data collection in Northport Harbor on Long Island, New York in May, 2008.: Open-File Report 2011-1041, 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/2011/1041/data/navigation/resgpspnts_northport.zip>
- <https://pubs.usgs.gov/of/2011/1041/html/catalog.html>
Cross, V.A., Bratton, J.F., Crusius, J., Kroeger, C.W., and Worley, C.W., 2011, Continuous Resistivity Profiling Data from Northport Harbor and Manhasset Bay, Long Island, New York: Open-File Report 2011-1041, 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: | -73.367117 |
| Maximum: | -73.3531 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | 40.888367 |
| Maximum: | 40.911567 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | 0.2 |
| Maximum: | 5.9 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 12.8 |
| Maximum: | 17.9 |
| Units: | degrees Celsius |
Character set.
Character set.
Character set. Two streamers were used during the survey - a 15 meter and 50 meter. This field allows quick identification of each.
| Range of values | |
|---|---|
| Minimum: | 133 |
| Maximum: | 135 |
| Units: | day |
Character set.
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
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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 Northport Harbor on northern Long Island, New York from May 12 to May 14, 2008.
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
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 "dogps" - shell script run under CYGWIN v. 1.5.1 (UNIX like environment that runs under Windows). This is the script used for the May 12 data collection:
files=`ls *.gps | cut -d. -f1` for file in $files do awk -f awkhold $file.gps $file >> day1gps.txt doneThe script not only parses the GPS navigation, but concatenates the results into a single file. This script was repeated for day 2 and day 3 (May 13 and May 14 respectively) with the output directed to day2gps.txt and day3gps.txt.
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 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 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 (1463 meters/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. Invalid data points were deleted. No other checks were performed. The "line" attribute reflects the linename assigned in the field. In general, the format is LXFX, which would refer to line number, file number (in the case that more than one file was collected on a single line). There are exceptions to this naming convention, and are usually a result of typos when entering the linename.
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
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| Data format: | This WinZip file contains the point shapefile as well as the associated metadata files. in format WinZip (version 9.0) Size: 120 KB |
|---|---|
| Network links: |
<https://pubs.usgs.gov/of/2011/1041/data/navigation/resgpspnts_northport.zip> <https://pubs.usgs.gov/of/2011/1041/html/catalog.html> |
| Media you can order: |
CD-ROM
(Density 640
MB)
(format ISO9660)
|
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