Online Links:
Online Links:
This dataset provides continuous resistivity profile data processed with varying water conductivity values along the line as opposed to a single water resistivity value. Varying water conductivity measurements are appropriate to process data that traverse a wide range of water salinities. These data are from the Indian River Bay, Delaware from USGS cruise 2010-006-FA of long east-west lines. The CRP system images the subsurface electrical properties of an estuarine, riverine or lacustrine environment. Resistivity differences can be attributed to subsurface geology (conductive vs less conductive layers) and hydrogeologic conditions with fresh water exhibiting high resistivity and saline conditions showing low resistivity.
;This is a water conductivity file, a comma separated ASCII text file ;A semicolon starts a command line ;Offset is the distance between the conductivity meter and first ;electrode in meters Offset=17.0 ;date, time, WaterRes(ohm-m) 2005-03-04, 18:00:18, 0.315822053 2005-03-04, 18:00:48, 0.315059762 2005-03-04, 18:01:18, 0.314602132 2005-03-04, 18:01:48, 0.315970342The process of preparing the YSI 600 XLM data for use with the resistivity processing was rather lengthy. The YSI data needed to be related to the resistivity data based on time. First, the raw YSI data were separated by day of acquisition into separate worksheets. Then a new column was added to reflect UTC time by adding 4 hours to the YSI time (local time).
BEGIN {
FS=","
}
{
FS=","
if ((NR != 1) && ($4 != 0))
{
resyear=2010
resmonth=substr($2,3,2)
resday=substr($2,1,2)
restime=$1
reshr=substr($1,1,2)
resmin=substr($1,3,2)
ressec=substr($1,5,2)
ohms= $4
outfile=$3 "_water.confmt"
printf("%s-%02d-%02d, %02d:%02d:%02d, %s\n",resyear, resmonth,resday, reshr, >resmin, ressec, ohms) >> outfile
}
}
Data sources used in this process:
files=`ls *.confmt | cut -d. -f1` for file in $files do awk -f addoffset $file.confmt > $file.con doneThe AWK script addoffset:
{
if (NR==1)
{
printf("Offset=17.6\n")
}
print $0
}
For April 15 data, the offset value was changed form 17.6 to 16.0.
Data sources used in this process:
Online Links:
Online Links:
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.
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) contains all the CRP data processed with continuous water conductivity values as well as the associated metadata files. in format ASCII Size: 42.5 |
|---|---|
| Network links: |
https://pubs.usgs.gov/of/2011/1039/data/resistivity/proc_resis/watercon_proc.zip https://pubs.usgs.gov/of/2011/1039/html/ofr2011-1039-catalog.html https://doi.org/10.3133/ofr20111039 |
The user must have software capable of uncompressing the zip file.