Short Citation:
Office for Coastal Management, 2021: Commercial Vessel Density October 2009-2010 AIS UTM19, https://www.fisheries.noaa.gov/inport/item/48871.

Item Identification

Title: Commercial Vessel Density October 2009-2010 AIS UTM19
Short Name: CommercialVesselDensityOctober2009-2010UTM19
Status: Completed
Publication Date: 2012-10
Abstract:

These data were generated to provide insight into marine traffic patterns on a macro scale so they could be analyzed across the coastal waters of the Continental United States, this data set is for the UTM Zone 19N. For this dataset a transit is counted for every unique vessel intersecting a 1 kilometer square grid cell each day. This data represents the total number of vessel transits from October 2009 - October 2010. Some grid cells were unable to be processed, but this does not interfere with the integrity of this dataset.

Please note multiple connection errors occurred during the time frame of this study. In most cases data gaps were filled by making subsequent request to the coastguard or other groups receiving the same data feed. However, due to resource constraints uninterrupted coverage was not obtained. Overall data outages were minimal on the order less than a day per month and because random and affect all areas uniformly do not has a significant effect on the integrity of the data. Also as stated on the USCG NAIS website AIS data is not representative of all vessel traffic and USCG NAIS receivers do not fully cover the entire extent of this study area. Please take time to understand both of these limitations.

Purpose:

To support coastal and ocean planning and other activities pursuant to the Energy Policy Act, Coastal Zone Management Act, Magnuson-Stevens Fishery Conservation and Management Act, National Environmental Policy Act, Rivers and Harbors Act and the Submerged Lands Act.

Notes:

11006

Other Citation Details:

was received by Office for Coastal Management (OCM) by Office of Coast Survey (OCS)

Supplemental Information:

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Transverse Mercator

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -123.0

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000.0

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.0001

Ordinate_Resolution: 0.0001

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983

Ellipsoid_Name: GRS 1980

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords Earth Science > Human Dimensions > Environmental Governance/Management
ISO 19115 Topic Category oceans
ISO 19115 Topic Category transportation
None AIS
None ship counts
None vessel traffic

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America
None United States

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Distribution Liability:

These data are intended for coastal and ocean use planning. Not for navigation.

Support Roles

Data Steward

CC ID: 652042
Date Effective From: 2012-10
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 652044
Date Effective From: 2012-10
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 652045
Date Effective From: 2012-10
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 652043
Date Effective From: 2012-10
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 652048
W° Bound: -72.539512
E° Bound: -65.305462
N° Bound: 45.072915
S° Bound: 33.591141

Extent Group 1 / Time Frame 1

CC ID: 652047
Time Frame Type: Discrete
Start: 2010

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Constraints:

None

Data Use Constraints:

These data are intended for coastal and ocean use planning. Not for navigation.

URLs

URL 3

CC ID: 652040
URL: https://marinecadastre.gov/data/
URL Type:
Online Resource

URL 4

CC ID: 652041
URL: https://coast.noaa.gov/
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 652058
Activity Date/Time: 2015-12-18
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 652057
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standard for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 717284
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Data Quality

Accuracy:

The attributes in this dataset are believed to be accurate.

Horizontal Positional Accuracy:

Maximum scale of intended use is 1:80,000.

Completeness Report:

Spatial and attribute properties are believed to be complete, although attribute information has been simplified. Geometric thresholds from original data are preserved. No tests have been completed for exhaustiveness.

Conceptual Consistency:

These data are believed to be logically consistent. Geometry is topologically clean.

Lineage

Sources

AIS Vessel Count - 2010

CC ID: 652032
Contact Name: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office of Coast Survey (OCS)
Publish Date: 2012-07-01
Extent Type: Range
Extent Start Date/Time: 2009-10
Extent End Date/Time: 2010-10
Source Contribution:

2010 Automatic Identification System (AIS) vessel count data for UTM Zone19N which provided information regarding vessel counts derived from AIS data at 1 kilometer square grids. | Type of Source Media: electronic mail system

NATIONWIDE AUTOMATIC IDENTIFICATION SYSTEM

CC ID: 652033
Contact Name: U.S. Department of Homeland Security, United States Coast Guard, Navigation Center
Publish Date: 2010-01-01
Extent Type: Range
Extent Start Date/Time: 2009-10
Extent End Date/Time: 2010-10
Citation URL: http://www.navcen.uscg.gov/?pageName=NAISmain
Source Contribution:

NATIONWIDE AUTOMATIC IDENTIFICATION SYSTEM | Type of Source Media: online

Process Steps

Process Step 1

CC ID: 652034
Description:

Source data derived from the raw AIS data processing is as follows:

The USCG maintains a network of AIS receivers that collects AIS messages from passing ships. These data are transmitted to USCG data center that compiles the data and provides data feeds to other government agencies. In accordance with the USCG COMDTINST 5230.80, the USCG provided OCS with a "Level A" data feed. Level A is unfiltered real-time data that is less than 96 hours from initial time of transmission. OCS has subscribed to this data since 2008. To limit data storage requirements the data feed was filtered by the USCG to only send one position message per ship per minute and all duplicate messages (i.e. ship broadcasts received by more than one NAIS station) were removed. This real time feed was archived at OCS. A specialized software NOAADATA.py (K. Schwehr. The noaadata-py Software Tool-set, v0.42, 2009. http://vislab-ccom.-unh.edu/schwehr/software/noaadata) is used to create daily files and and load the data into an Oracle Spatial database.

Despite receiving this filtered feed, a great deal of conditioning needs to take place to prepare this data to be analyzed. The AIS system was not intended or designed for subsequent analysis; however Calder and Schwehr ably proved, given the proper conditioning, AIS data can be used for traffic analysis. ( B. R. Calder., K. Schwehr. Traffic Analysis for the Calibration of Risk Assessment Methods. Proceedings: US Hydrographic Conference 2009, Norfolk, VA, 11-14 May 2009, http://www.thsoa.org/us09papers.htm) Based on their research, we filtered out AIS messages with non-unique user IDs and vessels with erroneous dimensions. We also separated messages by speed, separating those reporting a speed of less than 0.4 knots into a separate anchored table.

The accuracy and abundance of the AIS data support high resolution analysis specifically within port areas. This study however was interested in traffic patterns on a macro scale so patterns could be analyzed across the coastal waters of the Continental United States. To limit the processing time and the overall file size for each region a grid cell size of 1 kilometer was chosen.

For this dataset a transits is counted for every unique vessel intersecting a grid cell each day. Multiple trips into a grid cell on a given day by the same vessel are only counted as one transit. Instead of calculating transits based on the coordinates within the AIS message transit lines were created by connecting all the vessels reports each day. Traffic counts were then calculated by summing the number of lines within each cell. Although this dataset only contains the total traffic count "TRNSTS_TTL" the original dataset has transits by AIS vessel type and many other attributes as well. Processed from May - July 2012.

Process Date/Time: 2012-07-01 00:00:00
Source: NATIONWIDE AUTOMATIC IDENTIFICATION SYSTEM

Process Step 2

CC ID: 652035
Description:

Further data development processing followed to obtain this feature class:

Acquire original source data and maintain a copy on the development tier, create geodatabase import the original shapefiles. Delete all feature will zero values and validate the feature classes' geometry (Data Management > Features > Repair Geometry). Acquire, create and update metadata from providers (as needed). Compressed data set into a zip file for ease of download.

Process Date/Time: 2012-10-16 00:00:00
Source: AIS Vessel Count - 2010

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity (ENT) Commercial Vessel Density October 2009-2010 AIS UTM19

Catalog Details

Catalog Item ID: 48871
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 15:55+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-07-02 15:17+0000
Metadata Record Published: 2019-01-24
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2020-01-25