Appendix 1 - Geospatial Data

This appendix describes the data presented in this report, the location of the data, and how to access the data.

Data Format and Projection

The raster data are in Esri grid and GeoTIFF formats in Universal Transverse Mercator (UTM), Zone 18N, WGS 84 projection. These data can also be accessed through the U.S. Geological Survey Coastal and Marine Geology Program Web Map server (http://coastalmap.marine.usgs.gov).

All spatial data are distributed with Federal Geographic Data Committee-compliant metadata in 4 formats—extensible markup language (XML), text (TXT), hypertext markup language (HTML), and frequently asked questions HTML (FAQ). Esri ArcCatalog 9.x can be used to examine the metadata in a variety of additional formats.

Data Access

The spatial datasets presented here can be accessed in the following ways:

• Use ArcGIS 9.3 or later to view and manipulate all raster data, although the Spatial Analyst extension will be required to fully examine and work with the Esri grids. Download the GIS_catalog.zip file (54 megabytes) and open the ArcMap document 2011-005-fa.mxd. This map document has all the data layers loaded in the table of contents and uses relative links.

• Without any geographic information system (GIS) software, view the data through ArcReader, a free mapping application distributed by Esri for Windows, Linux, and Unix operating systems. Download ArcReader from the Esri Web site (http://www.esri.com/software/arcgis/arcreader/download.html) and follow the directions for downloading and installing the free software. Once ArcReader is installed, all the data can be viewed by opening the published map file (PMF) named 2011-005-fa.pmf, which was created in ArcMap version 9.3.1.

Data Organization

The data are organized in folders on the Publications Warehouse Web site (https://pubs.usgs.gov/of/2014/1203). The file structure is described below. Data layers can be downloaded individually through the table below or collectively from GIS_catalog.zip (54 MB). Layer files are provided for each of the Esri grids and can be used for data display.

GIS

grids


bathy

• fi_bathygrd—10-m interpolated bathymetric grid offshore of Fire Island, New York.

seismic

• fi_hiso—50-m grid of the modern sediment thickness (Holocene isopach) offshore of Fire Island, N.Y.
• fi_hts—50-m interpolated grid of the Holocene marine transgressive surface offshore of Fire Island, N.Y.
• fi_cpun—100-m interpolated grid of the coastal plain unconformity offshore of Fire Island, N.Y.

sonar

• fi_sonar5m—GeoTIFF image of 5-m acoustic backscatter offshore of Fire Island, N.Y.

Map Documents

2011-005-fa.mxd—ArcGIS 9.3 map document with all data loaded in the ArcMap table of contents.

2011-005-fa.pmf—Esri ArcReader (created with Esri ArcGIS Publisher 9.3) map document for use with free ArcReader software. Download ArcReader at http://www.esri.com/software/arcgis/arcreader/download.html.

Data Preview

The primary coordinate system for the raster data is WGS 84 UTM Zone 18N. The link in the Download column provides access to a compressed ZIP file, which contains the raster data. All of the seismic grids are stored in one ZIP file fi_seismic.zip.

Filename (Metadata)	Description	Preview	Download
fi_bathygrd HTML  FAQ  TXT XML	Grid: 10-m bathymetric grid in Esri 32-bit continuous floating point format		fi_bathy.zip 10.4 MB
fi_hiso HTML  FAQ  TXT XML	Grid: 50-m modern sediment thickness (Holocene isopach) in Esri 32-bit continuous floating point format		fi_seismic.zip 1.3 MB
fi_hts HTML  FAQ  TXT XML	Grids: 50-m Holocene marine transgressive surface in Esri 32-bit continuous floating point format		fi_seismic.zip 1.3 MB
fi_cpun HTML  FAQ  TXT XML	Grid: 100-m coastal plain unconformity in Esri 32-bit continuous floating point format		fi_seismic.zip 1.3 MB
fi_sonar5m HTML  FAQ  TXT XML	GeoTIF: 5-m backscatter mosaic of interferometric sonar data in 24-bit continuous unsigned integer GeoTIFF format		fi_sonar.zip 16.4 MB