Continuous Resistivity Profile Tracklines of Data Collected from Cape Cod National Seashore, May 17-20, 2004

The data were transferred from the logging computer via AGISSAdmin software.

The bathymetry text files needed to be merged with the GPS navigation files. The logging of the navigation files started at the same time as the logging of the resistivity files. Although the bathymetry data contains no time stamps, the assumption was made that the time span was the same as the navigation file. The bathymetry data was acquired in feet at a faster rate than the navigation data. An awk script was written to convert the bathymetry data to meters, pull the appropriate bathymetry point to match up with the navigation point, and output the format as SDDBT (the format that EarthImager expects). The points to pull was based on the assumption that the time span of navigation and bathymetry was the same, so took the total number of bathymetry points and divided it by the number of navigational fixes, and pulled the bathymetry point at that increment. Another awk script was written to merge the navigation data and bathymetry data into a single file.

$GPRMC lines with the GPS file that had bad time stamps or were otherwise corrupt were deleted.

The GPS files were processed using an AWK script to parse out the navigational and bathymetric information from the $GPRMC and $SDDPT strings and concatenate this information into a single file.

This comma delimited text file was then imported as a table into ArcView 3.3.

An avenue script (pnts2lines.ave) was run that converted the event theme to a polyline shapefile. The unique attribute "Linename" was used to generate a separate record for each individual acquisition line.

Lines for which there was no valid resistivity data were deleted.

Edits to the metadata were made to fix any errors that MP v 2.9.30 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. The source citation information is inferred from other information in the metadata and was not part of the original metadata file. Source time period of content was inferred from the time period of the dataset. Needed to add link to data in the distribution section. Other minor edits were probably performed (title, publisher, publication place, etc.). 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.

Added keywords section with USGS persistent identifier as theme keyword.