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Los Angeles and San Diego Margin High-Resolution Multibeam Bathymetry and Backscatter Data

Open-File Report 2004-1221
HOME
DATA
ARCINFO GRID format
XYZ format
LOCATION MAPS
Los Angeles (112 kb)
San Diego (101 kb)
METADATA

XYZ Format Data

This Open-File Report contains the multibeam bathymetry and acoustic backscatter data that the USGS, Western Region, Coastal and Marine Geology Team has processed into GIS ready formats as of April 2004.

The data are available in ArcInfo GRID (UTM, zone 11 projection) and XYZ (geographic coordinates) formats.

 

XYZ Download 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 (dumebat.xyz, dumemos.xyz).

Disclaimers:

These datasets in their present form were not originally intended for publication. The bathymetry and backscatter are full of data-collection and processing artifacts. Outside influences beyond our control required us to publish these datasets in their present form. Care must be taken not to confuse artifacts with real seafloor morphology and acoustic backscatter.

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.

 
Los Angeles Margin Bathymetry (see Location Map)
XYZ File File Information
DUMEBAT.ZIP value = depth: min = -298.78m,
max = -14.51m, 4-m spatial resolution,
2Mb compressed, 13Mb uncompressed
DELREYBAT.ZIP value = depth: min = -32.24m,
max = -17.88m, 4-m spatial resolution,
2Mb compressed, 13Mb uncompressed
REDONBAT.ZIP value = depth: min = -382.79m,
max = -11.07m, 4-m spatial resolution,
19Mb compressed, 93Mb uncompressed
PVBAT.ZIP value = depth: min = -486.53m,
max = -8-84m, 4-m spatial resolution,
19Mb compressed, 88Mb uncompressed
NTHSLFBAT.ZIP value = depth: min = -680.34m,
max = -14.71m, 8-m spatial resolution,
19Mb compressed, 89Mb uncompressed
MIDSLFBAT.ZIP value = depth: min = -444.68m,
max = -11.07m, 8-m spatial resolution,
20Mb compressed, 94Mb uncompressed
OUTSLFBAT.ZIP value = depth: min = -567.66m,
max = -28.488m, 8-m spatial resolution,
25Mb compressed, 116Mb uncompressed
GABBAT.ZIP value = depth: min =-82.36m,
max = -20.14m, 4-m spatial resolution,
31Mb compressed, 176Mb uncompressed
HUNTBAT.ZIP value = depth: min =-101.86m,
max = -2.82m, 4-m spatial resolution,
29Mb compressed, 160Mb uncompressed
NPHBAT.ZIP value = depth: min =-203.47m,
max = -1.94m, 4-m spatial resolution,
12Mb compressed, 59Mb uncompressed
PVEBAT.ZIP value = depth: min =-59.21m,
max = -2.98m, 4-m spatial resolution,
9Mb compressed, 47Mb uncompressed
SPBBAT.ZIP value = depth: min =-43.87m,
max = -5.77m, 4-m spatial resolution,
30Mb compressed, 170Mb uncompressed

 
San Diego Margin Bathymetry (see Location Map)
XYZ File File Information
SDMARBAT.ZIP value = depth: min = -1229.03m,
max = -17.759m, 8-m spatial resolution,
69Mb compressed, 315Mb uncompressed
SDAREA0BAT.ZIP value = depth: min = -96.78m,
max = -34.70m, 4-m spatial resolution,
12Mb compressed, 62Mb uncompressed
SDAREA2BAT.ZIP value = depth: min = -86.29m,
max = -17.47m, 4-m spatial resolution,
15Mb compressed, 78Mb uncompressed

 
Los Angeles Margin Backscatter (See Location Map)
XYZ File File Information
DUMEMOS.ZIP value = digital number: min = 47.00,
max = 250.00, 2-m spatial resolution,
10Mb compressed, 53Mb uncompressed
DELREYMOS.ZIP value = digital number: min =54.00,
max = 230.12, 2-m spatial resolution,
10Mb compressed, 52Mb uncompressed
REDONMOS.ZIP value = digital number: min =54.00,
max = 230.12, 2-m spatial resolution,
10Mb compressed, 52Mb uncompressed
PVMOS.ZIP value = digital number: min = 4.00,
max = 252.00, 2-m spatial resolution,
41Mb compressed, 298Mb uncompressed
NTHSLFMOS.ZIP value = digital number: min = 25.54,
max = 253.24, 4-m spatial resolution,
71Mb compressed, 349Mb uncompressed
MIDSLFMOS.ZIP value = digital number: min = 0.00,
max = 249.00, 4-m spatial resolution,
77Mb compressed, 376Mb uncompressed
OUTSLFMOS.ZIP value = digital number: min = 0.54,
max = 249.00, 4-m spatial resolution,
93Mb compressed, 451Mb uncompressed
GABMOS.ZIP value = digital number: min = 63.28,
max = 225.38, 4-m spatial resolution,
34Mb compressed, 176Mb uncompressed
HUNTMOS.ZIP value = digital number: min = 3.0,
max = 225.60, 4-m spatial resolution,
32Mb compressed, 161Mb uncompressed
NPHMOS.ZIP value = digital number: min = 115.00,
max = 234.05, 4-m spatial resolution,
12Mb compressed, 60Mb uncompressed
PVEMOS.ZIP value = digital number: min = 66.00,
max = 229.96, 4-m spatial resolution,
10Mb compressed, 48Mb uncompressed
SPBMOS.ZIP value = digital number: min = 93.24,
max = 225.22, 4-m spatial resolution,
34Mb compressed, 172Mb uncompressed

* NOTE: Acoustic backscatter strength has been converted from decibels (dB) to a non-dimensional digital number (DN) using the conversion,

Absolute Value(2DN/dB)

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

This data is not to be used for navigation

FGDC Compliant Metadata for ASCII XYZ format

 

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http://pubs.usgs.gov/of/2004/1221/dataxyz.html
maintained by Michael Diggles
last modified February 28, 2005 (mfd)
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