USGS OFR 2011-1003: Combined Multibeam and LIDAR Bathymetry Data from Eastern Long Island Sound and Westernmost Block Island Sound

U.S. Geological Survey Open-File Report 2011–1003

Combined Multibeam and LIDAR Bathymetry Data from Eastern Long Island Sound and Westernmost Block Island Sound – A Regional Perspective

Geographic Information System Data Catalog

Geographic Information System

This report contains Geographic Information System (GIS) data in both vector and raster format. The vector data are provided in shapefile format compatible with Environmental System Research Institute's (ESRI) ArcView and ArcGIS software. These data are in the Geographic, WGS84 coordinate system. The raster data are provided in GeoTIFF format and ESRI binary grid format. These raster data are provided in both the Geographic, WGS84 coordinate system and a Universal Transverse Mercator (UTM), Zone 18, NAD83 projection. Data layers archived here should not require additional processing to be used in ESRI software.

For users who do not have the ESRI software or a compatible GIS data browser available on their computers, a free viewer, ArcExplorer, is available from ESRI. The key functionality of ArcExplorer is the displaying of spatial data. The user will need to add the selected data layers by using ArcExplorer's add data button.

Data Description

This report includes links to several data layers (or themes) that can be used to create views of the offshore in eastern Long Island Sound study area. GeoTIFFs of the bathymetry are provided as color-hillshade relief images. ArcRaster binary grids of the bathymetric data are included at a 4-m resolution.

Ancillary vector data consist of polygon data layers that provide base maps of the coastline for the Long Island Sound GIS project area and an outline of the survey area.

Each GIS data layer from this publication is cataloged below for easy access. The individual data layers are described below and include the GeoTIFF, grid, or shapefile name (for example, eliscomb_4mbat_utm18.tif), which is linked to a browse graphic showing the data-layer extent and coverage. Selecting the data-layer name will result in the browse graphic being displayed in a separate browser window.

The top level of this report on the DVD-ROM contains an ESRI ArcView project file (eliscomb.apr) and an ESRI ArcMap document (eliscomb.mxd). The ESRI ArcMap document was created in ArcMap 9.2 but saved as an ArcMap 9.0/9.1 document to make it accessible to older versions of the software.

Federal Geographic Data Committee (FGDC) metadata for the individual data layers are provided in HTML, FAQ HTML, and text versions. Selecting associated metadata files from the table below will open the information in a new browser window.

A compressed (.zip), downloadable archive file containing the components of the shapefile, grid, or image for each data layer is also provided. Compressed, downloadable files were created by using the Windows program WINZIP v8.0. Users who do not have software capable of uncompressing the archived files may obtain a free version of the software from Pkware, Inc.

BATHYMETRIC IMAGERY

DATA-LAYER NAME AND DESCRIPTION	METADATA	FILES
eliscomb_4mbat_geo -- full-color, hill-shaded bathymetric imagery of the contiguous NOAA surveys in eastern Long Island Sound (geographic, WGS84) generated from the 4-m grid	HTML FAQ text	Zip (72.2 MB)
eliscomb_4mbat_utm18 -- full-color, hill-shaded bathymetric imagery of the contiguous NOAA surveys in eastern Long Island Sound (UTM, Zone 18, NAD83) generated from the 4-m grid	HTML FAQ text	Zip (77.5 MB)

BATHYMETRIC GRIDS

DATA-LAYER NAME AND DESCRIPTION	METADATA	FILE
eliscomb_geo -- 4-m bathymetric grid of the bathymetry from the contiguous NOAA surveys in eastern Long Island Sound (geographic, WGS84)	HTML FAQ text	Zip (130.3 MB)
eliscomb_utm -- 4-m bathymetric grid of the bathymetry from the contiguous NOAA surveys in eastern Long Island Sound (UTM Zone 18, NAD83)	HTML FAQ text	Zip (75.6 MB)

BASEMAP DATA

DATA-LAYER NAME AND DESCRIPTION	METADATA	FILE
ct_vicinity_geo -- digital vector shoreline shapefile for the Long Island Sound GIS project area (geographic, WGS84)	HTML FAQ text	Zip (4.7 MB)
eliscomb_outline -- boundary of the contiguous NOAA surveys in eastern Long Island Sound (geographic, WGS84)	HTML FAQ text	Zip (72 KB)

Individuals interested in accessing the NOAA Descriptive Reports, which contain detailed descriptions of the data-acquisition and data-processing methods, can view them as