Parent Layer: PEOPLE

Name: Vessel Traffic Patterns-AIS

Display Field: vesselCountRange

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: These data was generated to provide insight into traffic patterns on a macro scale so they could be analyzed across the coastal waters of the Continental United States. 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. There were some grid cells which were unable to be processed, but we do not believe this interferes 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.

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Spatial Reference: 102100  (3857)

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• classCode ( type: esriFieldTypeSmallInteger, alias: Classification Code )
• vesselCountRange ( type: esriFieldTypeString, alias: Vessel Count Range, length: 25 )
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