A map of the documented SAV habitat created from the aggregate extent of submerged aquatic vegetation in the Hudson River Estuary mapped in all six inventories (1997, 2002, 2007, 2014, 2016, 2018). In SAV communities Vallisneria americana and Myriophyllum spicatum are dominant in association with Ceratophyllum dermersum, Elodea muttallii, Najas sp., and Potamogeton perfoliatus.  The designation "submerged aquatic vegetation" explicitly excludes plant communities in which Trapa natans is dominant in association with Spriodela polyrhiza, Myriophyllum spicatum, and Nuphar advena.

This dataset documents areas where SAV has been known to occur and thereby considered acceptable habitats. SAV is an important habitat and site of primary production in many aquatic ecosystems. Prior to 1995 there was no baseline information on SAV extent or distribution in the tidal freshwater Hudson River or any information on how the extent of SAV is changing with time in the Hudson River Estuary. The 2018 mapping project is a continuation of the 1997, 2002, 2007, 2014 and 2016 SAV monitoring efforts. The current SAV mapping was conducted in order to determine the status of the resource in 2018, and to compare the extent of SAV in 2018 with that observed in 2016. This dataset is a derivative of the 2018, 2016, 2014, 2007, 2002, and 1997 datasets.

SAV mapping in the Hudson River Estuary was conducted in six time periods with different sources of funding. The 1997 mapping was initiated with NOAA funds, Hudson River Foundation funds, and N.Y. State Environmental Protection Funds through the Hudson River Estuary Program (HREP). In 2002, 2007, 2014, 2016 and 2018 mapping was undertaken with N.Y. State Environmental Protection Funds through HREP.

In 1994, a collaboration was initiated between the Institute of Ecosystem Studies (IES), now the Cary Institute of Ecosystem Studies, HRNERR/NYSDEC, and the Cornell Laboratory for Environmental Applications of Remote Sensing (CLEARS), now IRIS. In addition, New York Sea Grant, HREP, and the National Oceanic and Atmospheric Administration (NOAA) are identified as partners. These groups provided diverse expertise to enable the first broad delimitation of SAV in the Hudson.

Major tributaries and coves were mapped in addition to the main river area.

Hudson River National Estuarine Research Reserve (NERR) maintains the Hudson SAV data

Shape files are updated as amendments occur, or as errors in the data are discovered and corrected.

None

1. The NYSDEC Hudson River Estuary Program, NYSDEC Hudson River National Estuarine Research Reserve and Cornell Institute for Resource Information Sciences ask to be credited in derived products.
2. Secondary Distribution of the data is not allowed.
3. Any documentation provided is an integral part of the data set. Failure to use the documentation in conjunction with the digital data constitutes misuse of the data.
4. Although every effort has been made to ensure the accuracy of information, errors may be reflected in the data supplied. The user must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions.

This dataset shows the extent of SAV in 2018 based on aerial photography from 2018 and is the sixth inventory of Hudson River Estuary SAV.

This dataset shows the extent of SAV in 2016 based on aerial photography from 2016 and is the fifth inventory of Hudson River Estuary SAV.

This dataset shows the extent of SAV in 2014 based on aerial photography from 2014 and is the fourth inventory of Hudson River Estuary SAV.

This dataset shows the extent of SAV in 2007 based on aerial photography from 2007 and is the third inventory of Hudson River Estuary SAV.

This dataset shows the extent of SAV in 2002 based on aerial photography from 2002 and is the second inventory of Hudson River Estuary SAV.

This dataset shows the extent of SAV in 1997 based on aerial photography from 1995 and 1997 and is the first inventory of Hudson River Estuary SAV

A map of the extent and composition of tidal wetlands in the Hudson River Estuary in 2007.

This data set is a combination of NYSDEC shoreline information from the SAV project covering the estuary north of Manhattan and NOAA shoreline data for the New York/New Jersey Harbor. From Troy to the north end of Manhattan the shoreline is the same as the file fin_shore83.e00 bundled with the SAV files on CUGIR. From the north end of Manhattan south, this shoreline file is identical to NOAA's Medium Resolution Digital Vector Shoreline (1998) for the Contiguous United States.

An inventory of shoreline types (natural or engineered) for the tidal Hudson River shoreline from the Tappan Zee Bridge north to Troy.

Grid of elevations in meters of the floor of the Hudson River. The grid values were derived by merging gridded datasets originating from NOAA with a dataset originating from SUNY Stony Brook. The observations cover the Hudson River between the Verrazano Narrows and Troy; north of the City of Hudson there are no data for shoals shallower than 4 meters.

A map of the documented SAV habitat created from the aggregate extent of SAV in the Hudson River Estuary mapped in all six inventories (1997, 2002, 2007, 2014, 2016, 2018). This dataset documents areas where SAV has been known to occur and thereby considered acceptable habitats. Only one polygon exists in the dataset.

Aggregate distribution of submerged aquatic vegetation in the Hudson River Estuary for 1997, 2002, 2007, 2014, 2016 and 2018

Cornell Institute for Resource Information Sciences (Cornell IRIS)

The 2018 SAV inventory included broad delimitation of SAV and Water Chestnut beds in the Hudson River Estuary using aerial photography for primary data collection. Field sampling of random points was used to verify the photo interpretation, following established digital image processing accuracy assessment protocols. SAV and water chestnut polygons were visited in the field.

The shape file includes all SAV areas observed in the Hudson River Estuary from Hastings-on-Hudson north to the Federal Dam at Troy for the inventory years of 1997, 2002, 2007, 2014, 2016 and 2018.

This dataset is an aggregation of all areas mapped as SAV in the individual inventories. It documents areas where SAV has been known to occur and thereby considered acceptable habitats. The data quality information given here and the process steps described document the efforts of the 2018 survey, which was typical of the 2016 inventory. Delineation of the three land cover categories (Upland/Intertidal, Vegcode=1; SAV, Vegcode=2; Trapa natans, vegcode=3) was accomplished through on-screen digitization of digital aerial photography. The smallest feature that could reliably be drawn using this system was a polygon with an area of 5-10 m2 at a scale of 1:500. Polygons as small as 5m2 were created and were later aggregated to the minimum size delineation of 60m2 with polygons within 10 meters of each other being merged. Maps were created to be displayed at a scale of 1:24,000.

Shape files are accurate to the quality of the original topographic map. The minimum size polygon in the 2018 map is 60 m2.

Data can be obtained through primary contact.

User assumes all liability in the use of this data.