All of the data were handled in the same manner. All processed lines have a start shot, end shot, and every 1000th shot in between. Inconsistencies exist in the file naming convention for individual seismic data collection lines. Because the filenames reflect the original data file names acquired in the field, they were left alone.
No data were acquired on the following dates: 6/8/2006, 6/10/2006 6/12/2006, 6/13/2006, 6/15/2006, 6/16/2006, 6/17/2006, 6/18/2006, 6/19/2006, 6/20/2006. These dates correspond to Julian days 159, 161, 163, 164, 166, 167, 168, 169, 170, and 171 respectively. In addition, lines for which no valid seismic data were available, or extremely short lines, were deleted. Some lines acquired seismic data, but little or no navigation. These lines are also excluded. One line was re-run, so the original problematic line was excluded. The list of collected seismic lines excluded from this and subsequent datasets is as follows: Julian day 155 - apalachicola000 (rerun), apalachicola020 (too short), apalachicola027 (insufficient navigation). Julian day 160 - day160001 (insufficient navigation). Julian day 165 - day165001 (too short). Julian day 172 - JD172010 (too short), JD172014 (too short), JD172025 (too short). Julian day 173 - JD173009 (too short). Julian day 174 - JD174010 (too short).
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: unpublished material
Title: Data acquisition
Type_of_Source_Media: digital files
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20060603
Ending_Date: 20060627
Source_Currentness_Reference: ground condition of data acquisition
Source_Citation_Abbreviation: none
Source_Contribution:
The data were collected using the USGS WHCMSC Autonomous Surface Vessel (ASV) IRIS. This system is designed to operate in shallow water (1-5 meters). IRIS is a catamaran platform 3 meters in length, 1.2 meters in width, and approximately 118 kilograms. The vehicle is operated remotely through a wireless modem network enabling real-time monitoring of data acquisition. The system is navigated using a ZXW RTK augmented GPS system enclosed on a platform in the middle of the catamaran. An enclosed onboard micro-processor-based motor controller provides signals for speed and steering to hull-mounted brushless direct-current thrusters. A center-mounted keel encloses the chirp dual-frequency (100/400 kHz model 4200 EdgeTech) sidescan-sonar transducers and EdgeTech 424 chirp seismic-reflection hydrophones. Mounted in the port hull are the EdgeTech 424 chirp seismic-reflection transducer and a single-beam 235 kHz echosounder. A Sony IP based wireless video camera is installed on the mast of IRIS for the purpose of obstacle avoidance. An onboard Fluxgate magnetometer provides heading, heave, pitch, and roll. IRIS is powered by 2-4 24-volt NiMH batteries located in each hull and has an approximate run-time of five hours at 4 knots.
Process_Step:
Process_Description:
Seismic shot points at a regular interval can be extracted from a calibrated polyline-m seismic trackline. To do this, within ArcMap 9.2 hatches were created from the layer properties of the calibrated polyline. For Hatch Class, set the hatch interval to 1. Select the "Hatch Placement" button and check to start hatching at a value other than the lowest measure - start hatching at 0. Hatch definition (1000) - place hatches every 1000 hatch intervals using a marker symbol. Add Hatch Definition - add end hatch definition. For HatchDef(End) set the hatch to a marker, tolerance 0, and lateral offset 0. For this work there seemed to be a problem with a couple of the lines in terms of generating the start hatch. I was unable to figure out the problem and will just have to copy over shot one from the point shapefile at the end of the procedure. The affected lines are: asv06_JD175000, asv06_JD176001, asv06_JD176003 and asv06_day165005. This process step as well as all subsequent process steps was performed by the same person - VeeAnn A. Cross.
Source_Used_Citation_Abbreviation: asv_lines_Calibrated.shp
Process_Date: 2008
Source_Produced_Citation_Abbreviation: graphic hatches
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: Woods Hole Coastal and Marine Science Center
Address: 384 Woods Hole Rd.
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:
With all the hatches drawn, use the "convert hatches to graphics tool". This tool does not appear automatically and must manually be added to the toolbar. To do this, from the ArcMap (v. 9.2) menu Tools - Customize. Select the Commands tab. In the categories listing, scroll down to Linear Referencing and select "Convert Hatches to Graphics..." and drag and drop to an existing toolbar in ArcMap. Then click on this button. In the pop-up menu, select All feature in the layer, select the appropriate Hatch Class. Leave the default to draw only the converted graphics.
Process_Date: 2008
Process_Step:
Process_Description:
Then within ArcMap 9.2 use XTools Pro version 5.2 to convert the graphics to a shapefile. Feature conversions - Graphics to Shapes. Output: asv_1000shot_gra and automatically add feature class to current map. Do not add ID field and do not add TEXT field.
Process_Date: 2008
Process_Step:
Process_Description:
Within ArcMap 9.2 - ArcToolbox - Linear Referencing - Locate Features Along Routes. Input features: asv_1000shot_gra; input route features: asv_lines_Calibrated; route identifier: lmarkname; search radius: 1 meter (a slight search radius is needed because of rounding errors, some points would be lost); output event table: asv_1000shot_gra_LocateFeatu.dbf; output route identifier: lmarkname; measure field: shot. Left rest of options at default.
Process_Date: 2008
Process_Step:
Process_Description:
Within ArcMap 9.2 - ArcToolbox - Linear Referencing - Make Route Event Layer. Input route: asv_lines_Calibrated; route identifier: lmarkname; input event table: asv_1000shot_gra_LocateFeatu.dbf. For the event table properties, route identifier: lmarkname; event type: point; measure field: shot; left rest of options at default values. Then right mouse click on the event theme - data - export data. Export all the features to asv_1000shot.shp. At this point, copy the four missing shot #1's from allasv_nodupes_sort.shp into this shapefile from within editor.
Process_Date: 2008
Process_Step:
Process_Description:
Within ArcMap 9.2 use VACExtras v 2.1 - VAC Extras - Feat Conv - Table Sort with the primary sort field lmarkname in ascending order and the secondary sort field is shot in ascending order. Output the result to asv_1000shot_sort.shp.
Process_Date: 2009
Process_Step:
Process_Description:
Use XTools Pro v. 5.2 - XTools Pro - Table Operations - Add X, Y, Z coordinates. Add X coordinate with field name longitude and y coordinate with field name latitude. Then repeat the process specifying the output projection as UTM, Zone 16, WGS84 and add the X coordinate with field name easting and the Y coordinate with field name northing.
Process_Date: 2009
Process_Step:
Process_Description:
Additionally, I want to carry over some of the other information from the original point shapefile such as year, jday, and filename. Add the field "year" and use field calculator to set all the record values to 2006. Add the additional fields "jday" and "filename". To populate these fields, join this point shapefile to the asv_lines shapefile based on the lmarkname attribute. Select to join attributes from a table, field to base the join on in both tables - lmarkname. With the tables joined, can use field calculator to copy over the appropriate values. Then deleted the unnecessary fields generated during the locate features procedure - distance and ID.
Process_Date: 2009
Process_Step:
Process_Description:
Edits to the metadata were made to fix any errors that MP v 2.9.32 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 distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. 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: 20160629
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
Address: 384 Woods Hole Rd.
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