Cross, VeeAnn A. , 2010, RESGPSPNTS_JD250.SHP: Navigation, Bathymetry and Temperature Points at the Ship Position During Continuous Resistivity Profile Data Collection in the Potomac River/Chesapeake Bay on Sept. 7, 2006 on USGS Cruise 06018: Open-File Report 2009-1151, 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/2009/1151/data/navigation/resistivity/resgpspnts_jd250.zip>
- <https://pubs.usgs.gov/of/2009/1151/html/catalog.html>
Cross, VeeAnn A. , Foster, David S. , and Bratton, John F. , 2010, Continuous Resistivity Profiling and Seismic-Reflection Data Collected in 2006 from the Potomac River Estuary, Virginia and Maryland: Open-File Report 2009-1151, 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.
| Range of values | |
|---|---|
| Minimum: | -76.751217 |
| Maximum: | -76.45315 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | 38.077633 |
| Maximum: | 38.22835 |
| Units: | decimal degrees |
Character set.
Character set.
| Range of values | |
|---|---|
| Minimum: | 0.4 |
| Maximum: | 30.2 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 0.1 |
| Maximum: | 25.5 |
| Units: | degrees Celsius |
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, bathymetric values, and water temperature during the collection of continuous resistivity profile data.
AWK script awkit_tmp:
BEGIN {
FS=","
}
{
FS= ","
ARGC = 2
if ($1=="$GPRMC") {
gpstime = $2
hr = substr($2,1,2)
min = substr($2,3,2)
sec = substr($2,5,2)
latdeg = substr($4,1,2)
latmin = substr($4,3,6)
londeg = substr($6,2,2)
lonmin = substr($6,4,6)
declat = latdeg + (latmin/60)
declon = (londeg + (lonmin/60)) * -1
date = $10
day = substr($10,1,2)
month = substr($10,3,2)
year = substr($10,5,2)
printf("%8.6f, %8.6f, %s:%s:%s, %s, %s\n",declon, declat, hr, min, sec, date, ARGV[2])
}
}
This AWK script was initialized by "doawk" - shell script run under CYGWIN (UNIX like environment that runs under Windows):
files=`ls *.gps | cut -d. -f1` for file in $files do awk -f awkhold $file.gps $file >> resnav_jd250.txt done
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
{
shipdate = $1
gpstime = $2
latdeg = substr($5,1,2)
latdecmin = $6
declat = latdeg + (latdecmin/60)
londeg = substr($7,1,3)
londecmin = $8
declon = -1 * (londeg + (londecmin/60))
depmeters = $10 printf("%s, %s, %9.6f, %9.6f, %s\n",shipdate, gpstime, declat, >declon, depmeters)
}
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
Data sources produced in this process:
AWK script awknewgps:
BEGIN {
FS=","
}
{
FS=","
alltime=$2
hr=substr($2,1,2)
min=substr($2,4,2)
sec=substr($2,7,2)
month=substr($1,1,2)
day=substr($1,4,2)
yr=substr($1,9,2)
depth=$5
declon=$4 * -1
londeg=int(declon)
lonmin=(declon-londeg)*60
declat=$3
latdeg=int(declat)
latmin=(declat-latdeg)*60 >printf("$GPRMC,%s%s%s,A,%02d%06.3f,N,%03d%06.3f,W,000.0,0,%s%s%s,0,W*73\n",hr,min,sec,latdeg,latmin,londeg,lonmin,day,month,yr)
printf("$SDDPT,%s,0.0*56\n",depth)
printf("$SDMTW,24.3,C*01\n") }
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
Data sources produced in this process:
AWK script awkhold:
BEGIN {
FS = ","
}
{
FS = ","
ARGC = 2
depth = -9999
temp = -9999
if ($1=="$GPRMC")
{
utctime = $2
date = $10
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("%9.6f, %9.6f, %s, %s, %5.1f, %5.1f, %s\n", holddeclon, >holddeclat, holdutctime, holddate, holddepth, holdtemp, ARGV[2])
}
holdutctime = >substr(utctime,1,2)":"substr(utctime,3,2)":"substr(utctime,5,2)
holddate = date
holddeclon = declon
holddeclat = declat
holddepth = -9999
holdtemp = -9999
}
if ($1=="$SDDPT")
{
depthreal = $2
holddepth = depthreal
}
if ($1=="$SDMTW")
{
tempreal = $2
holdtemp = tempreal
}
}
END {
printf("%9.6f, %9.6f, %s, %s, %5.1f, %5.1f, %s\n", holddeclon, holddeclat, >holdutctime, holddate, holddepth, holdtemp, ARGV[2])
}
The running of the script was initiated with a simple executable shell script "doawk":
files=`ls *.gps | cut -d. -f1`
for file in $files
do
awk -f awkhold $file.gps $file >> resnav_jd250.txt
done
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
Data sources produced in this process:
schema.ini: [resnav_jd250.txt] Format=CSVDelimited ColNameHeader=True Col1=longitude Double Col2=latitude Double Col3=gpstime Text Width 8 Col4=gpsdate Text Width 10 Col5=depth_m float Col6=temp_c float Col7=linename Text Width 11
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov
Data sources produced in this process:
The primary navigation system used was a Lowrance 480M with an LGC-2000 Global Positioning System (GPS) antenna. The antenna was located 7.9 meters forward of the anchor point for the resistivity streamer, and approximately 3 meters forward of the fathometer transducer. These offsets were not entered into the GPS system. Additionally, because of navigation and fathometers issues, periodically the ship's navigation system was used to supplement these data. The ship had a Differential GPS (DGPS) system with the antenna placed in the same location as the Lowrance antenna. The fathometer was located (hull-mounted) roughly directly below the antenna, so no horizontal offset. Because of the mixture of systems, the accuracy is on the order of 20 meters.
On this day most of the bathymetric values were collected by the Lowrance fathometer. This fathometer was mounted mid-ship on the starboard side of the boat. The Lowrance manufacturer indicates the speed of sound used by the system to convert to depths is 4800 feet/second. The ship's fathometer was hull mounted approximately midship, relatively close to the navigation antenna. All values are assumed to be accurate to within 1 meter.
There is a navigational fix for every reading of resistivity data.
No duplicate points are present. The navigational fixes were 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 x2254 (voice)
(508) 457-2310 (FAX)
jbratton@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: 0.212 MB |
|---|---|
| Network links: |
<https://pubs.usgs.gov/of/2009/1151/data/navigation/resistivity/resgpspnts_jd250.zip> <https://pubs.usgs.gov/of/2009/1151/html/catalog.html> |
| 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