SDE Raster Dataset
Tags
vessel density, vessel type, AIS, Sacramento-San Joaquin Delta
This dataset contains vessel density grids for the Sacramento-San Joaquin Delta for the years 2011, 2013, 2015-2019 based on refined Automatic Identification System (AIS) data that are collected by the U.S. Coast Guard. From MarineCadastre website (https://marinecadastre.gov/ais/): "Automatic Identification System (AIS) data are collected by the U.S. Coast Guard through an onboard navigation safety device that transmits and monitors the location and characteristics of large vessels in U.S. and international waters in real time. The Bureau of Ocean Energy Management (BOEM) and the National Oceanic and Atmospheric Administration (NOAA) have worked jointly to repurpose and make available some of the most important records from the U.S. Coast Guards national network of AIS receivers. Information such as location, time, ship type, speed, length, beam, and draft have been extracted from the raw data and prepared for analyses in desktop GIS software. BOEM and NOAA have also worked together to build a collection of tools and instructional materials. These are designed to help analysts process the data and derive products that improve offshore site analysis, use-conflict studies, and the understanding of marine transportation patterns." According to Marinecadastre.gov, AIS data only account for 50-60% of vessel traffic furthermore, data are only required for larger passenger, tug, container, and tanker vessels while recreational, fishing, and military boats are not usually tracked . Additional information on caveats and AIS requirements can be found on the Marinecadastre AIS webpage: https://marinecadastre.gov/news/load.php?url=posts/automatic-identification-system.html See related dataset, Vessel Transit Count - Sacramento-San Joaquin Delta [ds2881].
From AIS Vessel Tracks 2019 Metadata ( https://inport.nmfs.noaa.gov/inport/item/59927 ) :
" A vessel track shows the location and characteristics of commercial and recreational boats as a sequence of positions transmitted by an Automatic Identification System (AIS). AIS signals are susceptible to interference and this can result in a gap within a vessel track. The distribution, type, and frequency of vessel tracks are a useful aid to understanding the risk of conflicting uses within a certain geographic area. The vessel track positions in this data set are collected and recorded from land-based antennas as part of a national network operated by the U.S. Coast Guard. "
Geospatially explicit boating data for the Sacramento-San Joaquin Delta could be used to inform restoration and recreation planning. Prior studies have used survey and boating counts to determine boating numbers and preferred routes. In this study, Automatic Identification System (AIS) data, collected by the US Coast Guard (USCG) were used to provide a spatially explicit picture of boating routes. AIS data has been used for a variety of coastal planning purposes. This study indicates the relevance of AIS data for planning in the Sacramento-San Joaquin Delta.
AIS data from 2015-2017 was downloaded from the NOAA Marine Cadastre site using an R script. The same script cleaned the data and readied it for processing with ArcGIS Pro using NOAA s AIS CSV to File Geodatabase tool. Once in the geodatabase format, the data was input into another NOAA AIS Trackbuilder tool. Lastly, the constructed tracks were analyzed using the NOAA AIS Vessel Transit Counter tool to construct vessel density maps. The 2011, 2013, 2018, and 2019 data was downloaded as pre-constructed tracklines by month. Months were merged by year, then the NOAA AIS Vessel Transit Counter tool was used to construct vessel density maps. Finally, vessel density data for years 2011, 2013, 2015-2019 were merged, summing cell values.
Bureau of Ocean Energy Management (BOEM) and National Oceanic and Atmospheric Administration (NOAA). MarineCadastre.gov. AIS Vessel Tracks 2019, 7/14/20 AIS Vessel Tracks 2018, 7/14/20 AIS Vessel Tracks 2013, 7/24/20 AIS Vessel Tracks 2011, 7/24/20 2017 Vessel Counts: All Vessels, 8/2/19 2016 Vessel Counts: All Vessels, 8/2/19 2015 Vessel Counts: All Vessels, 8/2/19 from marinecadastre.gov/data.
Disclaimer : The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.
Extent
West | -122.177317 | East | -121.012382 |
North | 38.812739 | South | 37.610042 |
Maximum (zoomed in) | 1:5,000 |
Minimum (zoomed out) | 1:150,000,000 |
Disclaimer : The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.