This layer shows the monthly transit counts in 2021 for vessels that carry Automatic Identification System (AIS) transponders. Automatic Identification Systems (AIS) are a navigation safety device that transmits and monitors the location and characteristics of many vessels in U.S. and international waters in real-time. The data represent vessel transit counts in 100 meter grid cells. A single transit is counted each time a vessel track passes through, starts, or stops within each grid cell.
\n \nNotes: Logical Consistency: No testing was performed on the source trackline data. Data were visually inspected to confirm that the results of the density analysis were reasonable. Completeness: Data are complete based on all known U.S. Coast Guard Nationwide Automatic Identification System records from 2021. Source data were created using the Marine Cadastre TrackBuilder Tool with filter settings of 30 minutes and 1 mile. The gridded raster identifies vessel transit counts based on the results of that analysis. Positional Accuracy: Horizontal accuracy is dependent on the location of the transmitted AIS locations from GPS and includes errors associated with this technology. Timeliness: 2021. Use restrictions: NOT FOR NAVIGATION. Distribution Liability: Data are provided as is. NROC and RPS Group Inc. are not liable for any interpretations, assumptions, or conclusions based on these data.
\n\n \n", "queryable": false, "id": 5422, "name": "AIS 2021 Monthly Data Sliders", "uuid": "d763875d-0377-47ac-a435-bf038ebd3cac", "type": "slider", "url": "", "proxy_url": false, "is_disabled": false, "disabled_message": null, "opacity": 0.5, "show_legend": true, "legend": "/static/legends/AISMonthly.png", "legend_title": null, "legend_subtitle": "Number of transits per cell", "description": "This layer shows the monthly transit counts in 2021 for vessels that carry Automatic Identification System (AIS) transponders. Automatic Identification Systems (AIS) are a navigation safety device that transmits and monitors the location and characteristics of many vessels in U.S. and international waters in real-time. The data represent vessel transit counts in 100 meter grid cells. A single transit is counted each time a vessel track passes through, starts, or stops within each grid cell.", "overview": "Logical Consistency: No testing was performed on the source trackline data. Data were visually inspected to confirm that the results of the density analysis were reasonable. Completeness: Data are complete based on all known U.S. Coast Guard Nationwide Automatic Identification System records from 2021. Source data were created using the Marine Cadastre TrackBuilder Tool with filter settings of 30 minutes and 1 mile. The gridded raster identifies vessel transit counts based on the results of that analysis. Positional Accuracy: Horizontal accuracy is dependent on the location of the transmitted AIS locations from GPS and includes errors associated with this technology. Timeliness: 2021. Use restrictions: NOT FOR NAVIGATION. Distribution Liability: Data are provided as is. 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