Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: Unpublished material
Title: Raw CRP Data
Type_of_Source_Media: hard disk
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20050503
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: raw crp data
Source_Contribution:
These data were acquired with an AGI SuperSting Marine system that is described at the website: www.agiusa.com/marinesystem.shtml. The particular system used for this acquisition was an 11 electrode array with electrodes spaced 5 meters apart. The potential electrodes are made of graphite, with the remaining electrodes stainless steel. A dipole-dipole configuration was used for the data collection in which two fixed current electrodes are assigned with the measurement of voltage potentials between electrode pairs in the remaining electrodes. Each line of data acquisition records several files. The two files necessary for processing are the *.stg and *.gps file. The STG file contains the resistivity data, while the GPS file contains the navigation information.
Process_Step:
Process_Description:
The data were transferred from the logging computer via AGISSAdmin software. The data file available for this day is L1F1.*.
Process_Date: Unknown
Process_Step:
Process_Description:
When the data were acquired, a scaling factor of 5 was used. However, because the initialization file already defined the electrodes as being 5 meters apart, this had the affect of indicating the electrodes were 25 meters apart. Therefore, Marine Log Manager was used to rescale the STG file, by using a scale factor of 0.2, to return the electrodes to the appropriate spacing.
Source_Used_Citation_Abbreviation: L1F1.stg
Process_Date: Unknown
Source_Produced_Citation_Abbreviation: L1F1_rescaled.stg
Process_Step:
Process_Description:
The fathometer was placed in a poor location on this day of surveying, essentially placing incorrect depth values in the GPS file. Another system (Radon) was acquiring valid fathometer data, so this information was to be incorporated into the resistivity GPS file. Unfortunately, the radon system lost navigation for approximately 1 hour (including bathymetry data), and that system only records a reading once a minute. To incorporate what radon data was of use, I first deleted any 0 navigation fix lines from the radon file. The radon file was then parsed with a python script (radonparse_nav2005withbathy.py). The resulting text file was then loaded as an event theme into ArcView and converted to s shapefile.
Process_Date: Unknown
Source_Produced_Citation_Abbreviation: day1radon.shp
Process_Step:
Process_Description:
At the same time, I took the reformatted GPS resistivity file and loaded it as an event theme to ArcView and converted it to a shapefile.
Process_Date: Unknown
Source_Produced_Citation_Abbreviation: templ1f1.shp
Process_Step:
Process_Description:
I then did a spatial join between the radon shapefile and the resistivity shapefile. This new table I exported to a text file. I renamed some column headings, brought it into ArcView as an event theme, and converted it to a shapefile.
Process_Date: Unknown
Source_Produced_Citation_Abbreviation: l1f1_joinradon.shp
Process_Step:
Process_Description:
I then added the filed "bestbathy" to l1f1_joinradon.shp. My first thought was to do a spatial join with the remaining resistivity lines to derive bathymetric values. However, this would not work due to the wind tide issue. The resistivity processing needs water depths at the time of acquisition, and with increased weather issues, the depth values in certain areas were very different between days. Instead, I used an avenue script to extract grid values from the estuary bathymetry grid to populate a "gridbathy" attribute.
Process_Date: Unknown
Process_Step:
Process_Description:
The shapefile was queried and any radon value (from the same day) within 25 meters of the resistivity point was used to populate the "bestbathy" field.
Process_Date: Unknown
Process_Step:
Process_Description:
The selection was then inverted and the high resolution bathymetry grid extracted values were used to populate the "bestbathy" field. This value was justified by a comparison of the high-resolution bathymetry to the radon bathymetry from the day of interest. In almost all cases, the radon bathymetry and the grid bathymetry were within 0.5 meters of one another.
Process_Date: Unknown
Process_Step:
Process_Description:
All fields not needed were turned off in the table properties, and the resulting table was exported to a comma delimited text file.
Process_Date: Unknown
Source_Produced_Citation_Abbreviation: l1f1_bestbathy.txt
Process_Step:
Process_Description:
This comma delimited text file was run through an awk script (awknewgps_bathy) to generate a gps file in the format used by Marine Log Manager.
Source_Used_Citation_Abbreviation: l1f1_bestbathy.txt
Process_Date: Unknown
Source_Produced_Citation_Abbreviation: l1f1_fixbathy.gps
Process_Step:
Process_Description:
Edits to the metadata were made to fix any errors that MP v 2.9.34 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The source information was incomplete and had to be modified to meet the standard. The process steps without process dates had the date set to unknown. The distributor information needed to be added, along with the distribution format and network resource. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.
Process_Date: 20161031
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description: USGS Thesaurus keywords added to the keyword section.
Process_Date: 20180720
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description: Crossref DOI link was added as the first link in the metadata.
Process_Date: 20191118
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20200908
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
