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Multibeam Bathymetry and Backscatter Data: Northeastern Channel Islands Region, Southern California

Data

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This Open-File Report contains the bathymetry and acoustic backscatter data from the 2004 multibeam survey in the Northeastern Channel Islands region, Southern California (see location map). The data are provided in three formats (ESRI's ArcInfo GRID, ASCII XYZ and TIFF) that can be used in a number of GIS and other spatial analysis software packages.

Both the bathymetry and acoustic backscatter data are provided as common grids of the entire survey area at 15- spatial resolution.

Downloading Instructions


BATHYMETRY DATA

XYZ ESRI ArcInfo GRID TIFF
bathyxyz.zip
25MB compressed,
113MB uncompressed
bathy.zip
16MB compressed,
176MB uncompressed
value = depth in meters
min = -25.66m,
max = -1246.18m
15-m spatial resolution

Projection Information
Geographic
Units: decimal degrees
Zunits:Meters
Datum: WGS84

value = depth in meters
min = -25.66m,
max = -1246.18m
15-m spatial resolution

Projection Information
UTM
Zone 11
Units: Meters
Zunits:Meters
Datum: WGS84

value = depth in meters
min = -25.66m,
max = -1246.18m
15-m spatial resolution

Projection Information
UTM
Zone 11
Units: Meters
Zunits:Meters
Datum: WGS84

FGDC Metadata Downloading Instructions


ACOUSTIC BACKSCATTER DATA

XYZ ESRI ArcInfo GRID TIFF
mosxyz.zip
24MB compressed,
109MB uncompressed
mos.zip
15MB compressed,
175MB uncompressed
value = digital number
min = 3.00,
max = -247.93
15-m spatial resolution

Projection Information
Geographic
Units: Decimal Degrees
Zunits:DN
Datum: WGS84

value = digital number
min = 3.00,
max = -247.93
15-m spatial resolution

Projection Information
UTM
Zone 11
Units: Meters
Zunits:DN
Datum: WGS84

value = digital number
min = 3.00,
max = -247.93
15-m spatial resolution

Projection Information
UTM
Zone 11
Units: Meters
Zunits:DN
Datum: WGS84

FGDC Metadata Downloading Instructions

Download Instructions

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

XYZ Format

1. Download the file to the desktop.

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

3. The uncompression will result in a new comma delimited file (i.e. bathyll.xyz).

ArcInfo GRID

1. Download the file to the desktop.

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

3. The uncompression will result in a new file in ESRI's interchange format (i.e. bathyutmg.e00).

4. Import into ArcGIS using Arctools.

Note: Downloading files 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.


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http://pubs.usgs.gov/of/2005/1153/ci-data.html
maintained by Michael Diggles
last modified July 5, 2005 (mfd)