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Multibeam Mapping of Selected Areas of the Outer Continental Shelf, Northwestern 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 1997 and 2002 multibeam sonar surveys of the Outer Continental Shelf, Northwestern 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.


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 (sbbathy.xyz, sbmos.xyz).

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.

XYZ File File Information
Stetson Bank
sbbathy.zip value = depth: min = -16.92m, max = -62.69m, 5-m spatial resolution, 4Mb compressed, 20Mb uncompressed
sbmos.zip value = DN: min = 63.92m, max = 214.88m, 5-m spatial resolution, 4Mb compressed, 20Mb uncompressed
West Flower Garden Bank
wfbathy.zip value = depth: min = -16.31m, max = -179.13m, 5-m spatial resolution, 31Mb compressed, 153Mb uncompressed
wfmos.zip value = DN: min = 0.0m, max = 241.36m, 5-m spatial resolution, 32Mb compressed, 147Mb uncompressed
East Flower Garden Bank
efbathy.zip value = depth: min = -18.21m, max = -146.66m, 5-m spatial resolution, 24Mb compressed, 124Mb uncompressed
efmos.zip value = DN: min = 27.90m, max = 231.10m, 5-m spatial resolution, 26Mb compressed, 119Mb uncompressed
MacNeil Bank
mnbathy.zip value = depth: min = -48.67m, max = -117.93m, 4-m spatial resolution, 94Mb compressed, 558Mb uncompressed
mnmos.zip value = DN: min = 17.0m, max = 244.83m, 4-m spatial resolution, 80Mb compressed, 502Mb uncompressed
Bright and Rankin Banks
brbathy.zip value = depth: min = -33.17m, max = -188.05m, 4-m spatial resolution, 107Mb compressed, 587Mb uncompressed
brmos.zip value = DN: min = 7.0m, max = 243.18m, 4-m spatial resolution, 84Mb compressed, 527Mb uncompressed
Geyer Bank
gybathy.zip value = depth: min = -39.11m, max = -224.22m, 4-m spatial resolution, 38Mb compressed, 202Mb uncompressed
gymos.zip value = DN: min = 10.00m, max = 245.72m, 4-m spatial resolution, 29Mb compressed, 190Mb uncompressed
Bouma, Rezak, Sidner, and McGrail Banks
mbbathy.zip value = depth: min = -32.24m, max = -242.26m, 4-m spatial resolution, 115Mb compressed, 644Mb uncompressed
mbmos.zip value = DN: min = 17.0m, max = 243.19m, 4-m spatial resolution, 118Mb compressed, 737Mb uncompressed
Sonnier Bank
snbathy.zip value = depth: min = -18.69m, max = -64.71m, 4-m spatial resolution, 26Mb compressed, 116Mb uncompressed
snmos.zip value = DN: min = 37.0m, max = 239.84m, 4-m spatial resolution, 24Mb compressed, 154Mb uncompressed
Alderdice Bank
adbathy.zip value = depth: min = -60.99m, max = -106.86m, 4-m spatial resolution, 39Mb compressed, 234Mb uncompressed
admos.zip value = DN: min = 63.0m, max = 240.0m, 4-m spatial resolution, 34Mb compressed, 210Mb uncompressed
Jakkula Bank
jkbathy.zip value = depth: min = -61.67m, max = -252.27m, 4-m spatial resolution, 41Mb compressed, 224Mb uncompressed
jkmos.zip value = DN: min = 74.33m, max = 238.81m, 4-m spatial resolution, 32Mb compressed, 190Mb 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 file and Winzip should start up.

Instructions

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 sbbathyg and sbmosg) are contained within each respective folder (sbbathy and sbmos).

ESRI GRID Files File Information
Stetson Bank
sbbathy.tgz value = depth: min = -16.92m, max = -62.69m, 5-m spatial resolution, 2Mb compressed, 4Mb uncompressed
sbmos.tgz value = DN: min = 63.92m, max = 214.88m, 5-m spatial resolution, 2Mb compressed, 4Mb uncompressed
West Flower Garden Bank
wfbathy.tgz value = depth: min = -16.31m, max = -179.13m 5-m spatial resolution, 7Mb compressed, 25Mb uncompressed
wfmos.tgz value = DN: min = 0.0m, max = 241.36m, 5-m spatial resolution, 7Mb compressed, 25Mb uncompressed
East Flower Garden Bank
efbathy.tgz value = depth: min = -18.21m, max = -146.66m, 5-m spatial resolution, 14Mb compressed, 20Mb uncompressed
efmos.tgz value = DN: min = 27.90m, max = 231.10m, 5-m spatial resolution, 13Mb compressed, 20Mb uncompressed
MacNeil Bank
mnbathy.tgz value = depth: min = -48.67m, max = -117.93m, 4-m spatial resolution, 43Mb compressed, 98Mb uncompressed
mnmos.tgz value = DN: min = 17.0m, max = 244.83m, 4-m spatial resolution, 45Mb compressed, 98Mb uncompressed
Bright and Rankin Banks
brbathy.tgz value = depth: min = -33.17m, max = -188.05m, 4-m spatial resolution, 49Mb compressed, 82Mb uncompressed
brmos.tgz value = DN: min = 7.0m, max = 243.18m, 4-m spatial resolution, 48Mb compressed, 81Mb uncompressed
Geyer Bank
gybathy.tgz value = depth: min = -39.11m, max = -224.22m, 4-m spatial resolution, 19Mb compressed, 30Mb uncompressed
gymos.tgz value = DN: min = 10.00m, max = 245.72m, 4-m spatial resolution, 17Mb compressed, 28Mb uncompressed
Bouma, Rezak, Sidner, and McGrail Banks
mbbathy.tgz value = depth: min = -32.24m, max = -242.26m, 4-m spatial resolution, 63Mb compressed, 142Mb uncompressed
mbmos.tgz value = DN: min = 17.0m, max = 243.19m, 4-m spatial resolution, 68Mb compressed, 138Mb uncompressed
Sonnier Bank
snbathy.tgz value = depth: min = -18.69m, max = -64.71m, 4-m spatial resolution, 11Mb compressed, 25Mb uncompressed
snmos.tgz value = DN: min = 37.0m, max = 239.84m, 4-m spatial resolution, 13Mb compressed, 24Mb uncompressed
Alderdice Bank
adbathy.tgz value = depth: min = -60.99m, max = -106.86m, 4-m spatial resolution, 19Mb compressed, 33Mb uncompressed
admos.tgz value = DN: min = 63.0m, max = 240.0m, 4-m spatial resolution, compressed, 33Mb uncompressed
Jakkula Bank
jkbathy.tgz value = depth: min = -61.67m, max = -252.27m, 4-m spatial resolution, 20Mb compressed, 35Mb uncompressed
jkmos.tgz value = DN: min = 74.33m, max = 238.81m, 4-m spatial resolution, 18Mb compressed, 35Mb uncompressed

Projection Information
Projection: UTM
Zone: 15
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, 03:45:48 AM