Keywords
Theme:
analyses, CMGP, Coastal and Marine Geology Program, dbSEABED, descriptions, geology, grain size, Marine Aggregates Resources and Processes, seabed, seafloor, sediment data, texture, U.S. Geological Survey, USGS, usSEABED, Woods Hole Science Center, University of Colorado, Institute of Arctic and Alpine Research, Benthic Habitats (Pacific) Project, Pacific Science Center, WHSC, PSC, INSTAAR
Theme:
oceans and estuaries, location, geoscientificInformation
Theme:
Oceans, Marine Sediments, Biogenic Sediments, Sediment Chemistry, Sediment Composition, Sediment Textures, Sedimentation, Terrigenous Sediments
Place:
Louisiana, Ship Shoal, Trinity Shoal, New Orleans, Gulf Coast, United States, Gulf of Mexico
Description
Abstract
This data layer is a point coverage of known sediment samplings, inspections and probings from the usSEABED data collection and integrated using the software system dbSEABED. This data layer represents the calculated (CLC) output of the dbSEABED mining software. It contains results from calculating variables using empirical functions working on the results of extraction or parsing. The CLC data is the most derivative and certainly the least accurate; however, many clients appreciate that it extends the coverage of map areas with attributes, especially physical properties attributes.
Purpose
To build a digital mapping of the character of the seabed on regional, national and global scales. These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information.
Supplementary Information
This data layer is a subset of the original usSEABED Gulf Coast data release version 1.0, and is geographically clipped to the offshore Louisiana geographical region.
Links to graphics describing the data
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Status of the data
Planned
Data update frequency:
As needed
Time period for which the data is relevant
Date and time:
2007
Description:
publication date
Publication Information
Who created the data: U.S. Geological Survey
Date and time:
2007
Publisher and place:
U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA
Series name: Open-File Report
Series issue: 2006-1195
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Data storage and access information
File name: la_clc
Type of data: vector digital data
Location of the data:
http://pubs.usgs.gov/of/2006/1195/data/usseabed/la_clc.zip
http://pubs.usgs.gov/of/2006/1195/htmldocs/data_catalog.htm
Data processing environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.1.1332
Accessing the data
Data format: ASCII
Size of the data: 0.954 MB
Data transfer size: 19.1 MB MB
How to decompress the file: no compression applied
Network location:
http://pubs.usgs.gov/of/2006/1195/data.usseabed/la_clc.txt
Access instructions: Downloadable thru the WWW
Available media: CD-ROM
Accessing the data
Data format: SHP
Size of the data: 0.954 MB
How to decompress the file: winzip
Network location:
http://pubs.usgs.gov/of/2006/1195/data/usseabed/la_clc.zip
http://pubs.usgs.gov/of/2006/1195/htmldocs/data_catalog.htm
Access instructions: Downloadable thru the WWW
Available media: CD-ROM
Constraints on accessing and using the data
Access constraints:
None
Use constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Details about this document
Contents last updated: 20070405
at time 10595300
Contents last reviewed: 20050512
Who completed this document
Matthew A. Arsenault
U.S. Geological Survey
mailing and physical address:
Woods Hole, MA 02543-1598
USA
(508) 548-8700 x2354 (voice)
(508) 457-2310 (fax)
marsenault@usgs.gov
Standards used to create this document
Standard name: FGDC Content Standards for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention used in this document: local time
Metadata profiles defining additonal information
ESRI Metadata Profile: http://www.esri.com/metadata/esriprof80.html
Horizontal coordinate system
Geographic coordinate system name: GCS_Assumed_Geographic_1
Details
Geographic Coordinate System
Latitude Resolution: 0.000000
Longitude Resolution: 0.000000
Geographic Coordinate Units: Decimal degrees
Geodetic Model
Horizontal Datum Name: North American Datum of 1927
Ellipsoid Name: Clarke 1866
Semi-major Axis: 6378206.400000
Denominator of Flattening Ratio: 294.978698
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Bounding coordinates
Horizontal
In decimal degrees
West:
-94.399440
East:
-88.202000
North:
30.643000
South:
26.405000
In projected or local coordinates
Left: -94.399440
Right: -88.202000
Top: 30.643000
Bottom: 26.405000
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Lineage
FGDC lineage
Process step 1
Process description: The data contained in this report were clipped from the larger citation using the 'Select' tool in the ArcToolbox, and selected using the following criteria: "LATITUDE" >=26.405 and "LATITUDE" <=30.643 and "LONGITUDE" <=-88.2020 and "LONGITUDE" >=-94.39667
Source used: GMX_CLC
Source produced: LA_CLC
Process date: 2006
Who did this process
Matthew A. Arsenault
U.S. Geological Survey
mailing and physical address:
Woods Hole, MA 02543-1598
USA
508-548-8700 x2354 (voice)
508-457-2310 (fax)
marsenault@usgs.gov
Sources
Source 1:
GMX_CLC: usSEABED CaLCulated data for the Gulf of Mexico and Caribbean (Puerto Rico and U.S. Virgin Islands)
Media: online
Scale denominator: See separate listing contained within the Larger_Work_Citation of the Source_Citation for specific sources and associated metadata
Contribution: point locations, descriptions and analytical data on many different types of sediment and rock materials and benthos for the entire U.S. Gulf coast
Currentness of this source
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Spatial data quality
Horizontal positional accuracy
Locational accuracy is dependent on the accuracy of the navigational technique from the individual data sources and may vary widely (e.g., from 0.005km (differential GPS) in more recent surveys to greater than 2 km based on radar, Loran, or dead reckoning in older surveys.) Users of the data should use their own criteria for assessing the accuracy of the locations.
Vertical positional accuracy
Locational accuracy is dependent on the accuracy of the navigational technique from the individual data sources. Users of the data should use their own criteria for assessing the accuracy of the locations.
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Spatial data description
Vector data information
ESRI description
la_clc
ESRI feature type: Simple
Geometry type: Point
Topology: FALSE
Feature count: 35720
Spatial Index: TRUE
Linear referencing: FALSE
SDTS description
Feature class: SDTS feature type, feature count
la_clc:
Entity point, 35720