Bratton, John F. , and Cross, VeeAnn A. , 2014, Raw and modified raw continuous resistivity profiling data collected in the Indian River Bay, Delaware, on April 14, 2010, on U.S. Geological Survey Field Activity 2010-006-FA: Open-File Report 2011-1039, 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:
- <http://pubs.usgs.gov/of/2011/1039/data/resistivity/raw_resis/apr14_raw.zip>
- <http://pubs.usgs.gov/of/2011/1039/html/ofr2011-1039-catalog.html>
Cross, V.A., Bratton, J.F., Michael, H.A., Kroeger, K.D., Green, A., and Bergeron, E., 2014, Continuous Resistivity Profiling and Seismic-Reflection Data Collected in April 2010 from Indian River Bay, Delaware: Open-File Report 2011-1039, U.S. Geological Survey, Reston, VA.Online Links:
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 Degrees and decimal minutes.
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.
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The purpose of this dataset is to provide the raw and modified raw continuous resistivity profile data collected on April 14, 2010 in Indian River Bay by the AGI SuperSting system. Modifications to the raw data were necessary in order to prepare the data for processing. In order to effectively process the resistivity data, valid depth values are necessary. This raw dataset contains the original GPS files as well as the "newgps" files that are used in the eventual processing of the data.
Person who carried out this activity:
(508) 548-8700 x2337 (voice)
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ebergeron@usgs.gov
awkhold:
BEGIN {
FS = ","
}
{
FS = ","
ARGC = 2
depth = -9999
temp = -9999
if ($1=="$GPRMC")
{
utctime = $2
utcdate = $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("%s, %s, %9.6f, %9.6f, %5.1f, %5.1f, %s\n", holdutctime, holdutcdate, holddeclon, holddeclat, holddepth, holdtemp, ARGV[2])
}
holdutctime = utctime
holdutcdate = utcdate
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, %s, %9.6f, %9.6f, %5.1f, %5.1f, %s\n", holdutctime, holdutcdate, holddeclon, holddeclat, holddepth, holdtemp, ARGV[2])
}
This file was executed by a shell script to effectively batch process all the files in a single folder with the extension gps. The batch processor was dohold.
dohold:
files=`ls *.gps | cut -d. -f1 | tr "[A-Z"] ["a-z"]` for file in $files do awk -f awkhold $file.gps $file > $file.holds doneUnder Cygwin, all of the *.holds files were concatenated into a single comma-delimited text file and a header line added to the file. The header line added to the text file was: gpstime, gpsdate, longitude, latitude, depth_m, temp_c, line. Using ArcMap 9.2 - Tools - Add XY Data, the comma-delimited text file was added as an event theme to ArcMap. Quick visual inspection spotted erroneous navigation fixes. These fixes were then deleted from the original GPS files. These edits were performed on L6F1, L6F7, and L7F7. The modified GPS files had "_mod" appended to the prefix of the filename.
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:
awknewgps:
BEGIN {
FS=","
}
{
FS=","
alltime=$1
alldate=$2
tempc=$5
depth=$7
outfile=$6 "_newgps.gps"
declon=$3 * -1
londeg=int(declon)
lonmin=(declon-londeg)*60
declat=$4
latdeg=int(declat)
latmin=(declat-latdeg)*60
printf("$GPRMC,%06d,A,%02d%06.3f,N,%03d%06.3f,W,000.0,0,%06d,0,W*73\n",alltime,latdeg,latmin,londeg,lonmin,alldate) >> outfile
printf("$SDDPT,%s,0.0*56\n",depth) >> outfile
if (tempc != -9999) {
printf("$SDMTW,%s,C*01\n",tempc) >> outfile
}
}
Effectively what this script does is not only format the GPS file, but also output the information to the appropriate filename (which is based on the line name).
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 navigation system used was a Lowrance 480M with an LGC-2000 Global Positioning System (GPS) antenna. The antenna was located directly above the fathometer transducer mount point, but offset to the starboard by 2 meters from the resistivity streamer tow point. GPS data are assumed to be accurate wtihin 10 meters on this survey.
All bathymetry values were acquired by the 200 kHz Lowrance fathometer. The fathometer was mounted on the starboard side of the R/V Knob, directly below the GPS antenna. The Lowrance manufacturer indicates the speed of sound used by the system to calculate depth is 4800 feet/second. The depth values are not corrected for the approximately 0.2 m transducer draft. All depth values are assumed to be accurate to within 1 meter.
Apparent gaps based on the file naming convention appear in this dataset. These data files were not omitted, no data were collected on these lines. The apparent missing files from this day are L6F6, L6F8, L7F2, L7F3, L7F4, L7F6, L7F8, L7F9, L7F11, L7F15, L7F16, and L9F2. The name of one file doesn't follow the regular naming convention - F7L19 (was intended to be L7F19).
Each file was looked at individually, but the files as a collection were handled in the same manner.
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.
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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: | The WinZip (v. 14) file contains all the raw CRP data from April 14, 2010 as well as the associated metadata files. in format ASCII Size: 1.02 MB |
|---|---|
| Network links: |
<http://pubs.usgs.gov/of/2011/1039/data/resistivity/raw_resis/apr14_raw.zip> <http://pubs.usgs.gov/of/2011/1039/html/ofr2011-1039-catalog.html> <http://dx.doi.org/10.3133/ofr20111039> |
The data are provided in a zip compressed file. The user must have software capable of uncompressing the archive. In addition, the raw data are available in a format compatible with AGI Geosciences Marine Log Manager software. The user must have software capable of reading the AGI format in order to process these data.
(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov