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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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Page Last Modified: Friday, January 11, 2013, 03:46:25 AM