Bratton, John F. , and Cross, VeeAnn A. , 2011, RESGPSPNTS_JD136.SHP: Navigation and Bathymetry Points of Ship Position During Continuous Resistivity Profile Data Collection in the Corsica River Estuary, Maryland on May 16, 2007 on USGS Cruise 07005: Open-File Report 2010-1094, 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/2010/1094/resgpspnts_jd136.zip>
- <https://pubs.usgs.gov/of/2010/1094/html/catalog.html>
Cross, VeeAnn A. , Bratton, John F. , Worley, Charles R. , Crusius, John, and Kroeger, Kevin D. , 2011, Continuous resistivity profiling data from the Corsica River Estuary, Maryland: Open-File Report 2010-1094, 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 North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257222.
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: | -76.149983 |
| Maximum: | -76.10665 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | 39.074133 |
| Maximum: | 39.087067 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | 0.2 |
| Maximum: | 296 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | -9999 |
| Maximum: | 4.1 |
| Units: | degrees Celsius |
Character set.
| Range of values | |
|---|---|
| Minimum: | 136 |
| Maximum: | 136 |
| Units: | days |
Character set.
Character set.
Character set.
(508) 548-8700 x2254 (voice)
(508) 457-2310 (FAX)
jbratton@usgs.gov
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 16, 2007.
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 "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
Data sources used in this process:
Data sources produced in this process:
Data sources used in this process:
Data sources produced in this process:
Data sources used in this process:
Data sources produced in this process:
Data sources used in this process:
Data sources produced in this process:
Data sources used in this process:
Data sources produced in this process:
Data sources used in this process:
Data sources produced in this process:
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 last file from the previous day of data acquisition was L13F1. The first file for this day of acquisition was L15F1. No file L14F1 was ever generated. All available navigation and bathymetry information available on this day is included in the dataset. Files L24F2, L25F1, L26F1, L27F1, L28F1 and the first part of L29F1 did not have bathymetry values in the navigation files. All other files from this day did have fathometer data. None of the GPS files have temperature data.
No duplicate points are present. The navigational fixes checked for valid values. Invalid data points were deleted. No other checks were performed.
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: 0.160 MB |
|---|---|
| Network links: |
<https://pubs.usgs.gov/of/2010/1094/html/catalog.html> <https://pubs.usgs.gov/of/2010/1094/data/navigation/resgpspnts_jd136.zip> |
| Media you can order: |
DVD-ROM
(Density 4.75
GBytes)
(format UDF)
|
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