Large Debris Entities from Shoreline Surveys

Descriptive mission name

Description of notable aspects of mission

Midway Marine Debris Removal: all shore-based mission at Midway Atoll

NWHI Marine Debris Removal: Midway component to a ship-based NWHI debris mission

ID of waypoint taken by GPS to mark debris item

Latitude of debris item

(unit = decimal degree in WGS 1984 Geographic Coordinate System)

Longitude of debris item

(unit = decimal degree in WGS 1984 Geographic Coordinate System)

Type of large or notable debris recorded: NET, METAL, OTHER

Status of debris when found

STRANDED: on land

BURIED: submerged underwater/partially buried

Second longest measurement of this debris item (unit = meters)

Longest measurement of this debris item

(unit = meters)

Indication of whether the debris item was visibly related to the Japanese tsunami of 2011 (1/yes, 0: no)

Description of notable characteristics of debris item and indication of whether debris item was removed from shoreline

Start date and time of survey

End date and time of survey

3 character island code

MID: Midway Atoll

Island or sub-island name: Eastern Island, Sand Island, Spit Island.

General location of survey area within the island or sub-island specified in the SPECIFIC_LOCATION column: North, South, East, West, Northeast, Northwest, Southeast, Southwest.

Beginning latitude of survey area from GPS unit (unit = decimal degree in WGS 1984 Geographic Coordinate System). Null if survey areas of Sand Island in Midway Atoll are not tracked.

Beginning longitude of survey area from GPS unit (unit = decimal degree in WGS 1984 Geographic Coordinate System). Null if survey areas of Sand Island in Midway Atoll are not tracked.

End latitude of survey area from GPS unit (unit = decimal degree in WGS 1984 Geographic Coordinate System). Null if survey areas of Sand Island in Midway Atoll are not tracked.

End longitude of survey area from GPS unit (unit = decimal degree in WGS 1984 Geographic Coordinate System). Null if survey areas of Sand Island in Midway Atoll are not tracked.

Average width of shoreline, from vegetation to high tide line (unit = meters). In 2013, the shoreline width was inconsistently collected (null if the data was not collected).

Date of last survey, if known. Inconsistently documented.

Indication of whether a major storm has occurred since the last survey (1/ storm occurred; 0/no known storm). Inconsistently documented.

Date of most recent storm, if known. Inconsistently documented.

Description of the major storm if STORM_ACTIVITY column is 1 (dates, names of storms, etc.). Inconsistently documented.

Brief weather observations. Inconsistently documented.

Total number of participants for the survey.

Total weight of debris removed, may not be total of all tallied items (unit = kilograms).

Radiation level of survey area, only measured for selected segment in 2013 (unit = rem).

Segment ID of 300-meter segment along the shorelines of Eastern (EAS) and Spit (SPT) Islands on Midway Atoll. Survey areas of Sand Island (SAN) are often not tracked, and no ID is assigned.

Area surveyed, derived by digitizing GPS tracks of survey area in ArcGIS 10.x (unit = square kilometers, WGS 1984 UTM Zone 1N). Null if survey areas of Sand Island in Midway Atoll are not tracked.