USGS: Pacific Sea-Floor Mapping: West Florida Shelf Open File Report: Data

Multibeam Mapping of the West Florida Shelf, Gulf of Mexico

Multibeam Bathymetry and Acoustic Backscatter Data

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This Open-File Report contains the bathymetry and acoustic backscatter data from the 2001 multibeam survey of the West Florida Shelf, Gulf of Mexico. The data are provided in two formats (XYZ and ArcInfo GRID) that can be used in a number of GIS and other software packages.

Data

XYZ format

The data are available in comma delimited XYZ (x-coordinate, y-coordinate, value) format.

Instructions

1. Click on the links below to download the files.

2. Uncompress the files. The files are compressed with WinZip 7.0.

3. The uncompression will result in a new comma delimited file (bathy.csv, mos.csv).

Disclaimer: Downloading files from the Internet can sometimes be problematic. Different web browsers and operating systems act differently. The instructions above may vary from system to system or may not work at all.

Northern Region
Bathymetry nbathy.zip	value = depth: min = -129.94m , max = -46.92m 8-m spatial resolution 82Mb compressed, 408Mb uncompressed
Backscatter nmos.zip	value = DN: min = 115.00m , max = 243.56m 8-m spatial resolution 87Mb compressed, 402Mb uncompressed
Central Region
Bathymetry cbathy.zip	value = depth: min = -188.70m , max = -50.48m 8-m spatial resolution 115Mb compressed, 560Mb uncompressed
Backscatter cmos.zip	value = DN: min = 151.00m , max = 253.96m 8-m spatial resolution 121Mb compressed, 549Mb uncompressed
Southern Region
Bathymetry sbathy.zip	value = depth: min = -188.39m , max = -48.15m 8-m spatial resolution 88Mb compressed, 436Mb uncompressed
Backscatter smos.zip	value = DN: min = 151.00m , max = 250.00m 8-m spatial resolution 94Mb compressed, 37Mb uncompressed
Steamboat Lumps
Bathymetry sbbathy.zip	value = depth: min = -152.84m , max = -68.99m 4-m spatial resolution 121Mb compressed, 37Mb uncompressed
Backscatter sbmos.zip	value = DN: min = 161.00m , max = 251.00m 4-m spatial resolution 135Mb compressed, 37Mb uncompressed

Projection Information
Geographic
Units: Decimal Degrees
Zunits: NO [backscatter]; Meters [bathymetry]
Datum: WGS84

FGDC Compliant Metadata for ASCII XYZ format
FAQ
HTML
TEXT

ArcInfo GRID format

The data are also available in ArcInfo GRID format that can be used directly in ESRI ArcInfo, ArcView, or any other GIS or remote sensing software package that supports ESRI GRID format. In ArcView, the GRID files will be most useful with the Spatial Analyst Extension.

Disclaimer: Downloading files from the Internet can sometimes be problematic. Different web browsers and operating systems act differently. The instructions below may vary from system to system or may not work at all.

One known problem is sometimes Netscape Navigator automatically changes the .tgz suffix to .tar during the download. If this happens change the .tar suffix back to .tgz after the download. Double click on the icon and Winzip should start up.

Download GRIDS to desktop

1. Click on each link below to download the files to the desktop.

2. Uncompress and unbundle the files. Since ESRI GRIDs are directories of files the directories have been bundled into a single file for downloading. Each bundled file is also compressed for faster downloading.

Windows - Double click on each file. Winzip 7.0 will recognize the file is compressed and bundled.

UNIX - Uncompress using "gunzip" then unbundle using "tar xf".

3. The bathymetry and acoustic backscatter GRID files (i.e nbathyg and nmosg) are contained within each respective folder (nbathy and nmos).

Northern Region
Bathymetry nbathy.tgz	value = depth: min = -129.94m , max = -46.92m 8-m spatial resolution 42Mb compressed, 153Mb uncompressed
Backscatter nmos.tgz	value = DN: min = 115.00m , max = 243.56m 8-m spatial resolution 39Mb compressed, 149Mb uncompressed
Central Region
Bathymetry cbathy.tgz	value = depth: min = -188.70m , max = -50.48m 8-m spatial resolution 60Mb compressed, 227Mb uncompressed
Backscatter cmos.tgz	value = DN: min = 151.00m , max = 253.96m 8-m spatial resolution 54Mb compressed, 226Mb uncompressed
Southern Region
Bathymetry sbathy.tgz	value = depth: min = -188.39m , max = -48.15m 8-m spatial resolution 47Mb compressed, 192Mb uncompressed
Backscatter smos.tgz	value = DN: min = 151.00m , max = 250.00m 8-m spatial resolution 42Mb compressed, 176Mb uncompressed
Steamboat Lumps
Bathymetry sbbathy.tgz	value = depth: min = -152.84m , max = -68.99m 4-m spatial resolution 56Mb compressed, 113Mb uncompressed
Backscatter sbmos.tgz	value = DN: min = 161.00m , max = 251.00m 4-m spatial resolution 58Mb compressed, 113Mb uncompressed

Projection Information
Projection: UTM
Zone: 16
Datum: WGS84
Units: Meters
Zunits: NO [backscatter]; Meters [bathymetry]

FGDC Compliant Metadata for ArcInfo GRID format:
FAQ
HTML
TEXT

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U.S. Department of the Interior | U.S. Geological Survey
URL: http://pubsdata.usgs.gov/pubs/of/2002/0005/site/data.html
Page Contact Information: GS Pubs Web Contact
Page Last Modified: Wednesday, 07-Dec-2016 19:22:45 EST