FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
VERSION 2007

TITLE: US SEABED EXTRACTED DATA - ATLANTIC OCEAN

Geodataset Name:       SEABED_ATL_EXT_2005
Geodataset Type:       SHAPEFILE
Geodataset Feature:    Point
Feature Count:         2516
GENERAL DESCRIPTION:
This dataset contains known sediment samplings, inspections and probings from the usSEABED data collection and integrated using the software system dbSEABED. This data layer represents the extracted (EXT) output of the dbSEABED mining software. It contains data items which were simply extracted from the data resources through data mining.
DATA SOURCE(S):                    U.S. GEOLOGICAL SURVEY
SCALE OF ORIGINAL SOURCE MAPS:     N/A
DATE OF AUTOMATION OF SOURCE:      2005
GEODATASET EXTENT:                 STATE OF FLORIDA

FEATURE ATTRIBUTE TABLES:

Datafile Name: SEABED_ATL_EXT_2005.DBF
ITEM NAME WIDTH TYPE N. DECIMAL DEGREES
LATITUDE
19 Number 5
LONGITUDE
19 Number 5
WATERDEPTH
4 Number ---
SAMPLETOP
12 Number 2
SAMPLEBASE
12 Number 2
SITENAME
42 String ---
DATASETKEY
3 Number ---
SITEKEY
6 Number ---
SAMPLEKEY
6 Number ---
SAMPLER
31 String ---
DATATYPES
17 String ---
GRAVEL
3 Number ---
SAND
3 Number ---
MUD
3 Number ---
CLAY
3 Number ---
GRAINSIZE
7 Number 1
SORTING
6 Number 1
CLSMSHP
3 Number ---
FOLKCODE
7 String ---
SHEPARDCOD
19 String ---
ROCKMSHP
3 Number ---
WEEDMSHP
3 Number ---
CARBONATE
3 Number ---
MUNSLCODE
11 String ---
ORGCARBON
7 Number 1
LGSHEARSTR
11 Number 2
POROSITY
3 Number ---
PWAVEVEL
4 Number ---
LGCRSHST
3 Number ---
SAMPLEPHAS
59 String ---
DESCRIPT
31 String ---
FGDLAQDATE
8 Date ---
OBJECTID
4 OID ---
SHAPE
4 Geometry ---
AUTOID
4 Integer ---

FEATURE ATTRIBUTE TABLES CODES AND VALUES:

Item
Item Description
LATITUDE Latitude coordinate of sample location

LONGITUDE Longitude coordinate of sample location

WATERDEPTH Measured water depth for site (usually uncorrected)

SAMPLETOP measured subbottom depth information for each point sample

SAMPLEBASE measured subbottom depth information for each point sample

SITENAME Survey or laboratory code for site (non-unique)

DATASETKEY Unique sequential numeric key to SRC file

SITEKEY Unique sequential numeric key to SRC file

SAMPLEKEY Unique sequential numeric key to SRC file

SAMPLER Equipment used to collect samples

DATATYPES Type of data that were used to derive values held in characterization
ACU = Acoustic Properties

CMP = Sediment Composition

COL = Color

GTC = Geotechnical Properties

GRZ = Grain Size

TXR = Texture

TXG = Texture (Graphic)

LTH = Lithology


GRAVEL Gravel grainsize fraction

SAND Sand grainsize fraction

MUD Mud grainsize fraction

CLAY Clay grainsize fraction

GRAINSIZE Phi characteristic grainsize

SORTING Phi grainsize dispersion; standard deviation sorting only

CLSMSHP Class membership; fuzzy membership (%) of above Class (Facies)

FOLKCODE Grainsize classification
(g)M = slightly gravelly mud

(g)mS = slightly gravelly muddy sand

(g)sM = slightly gravelly sandy mud

(g)S = slightly gravelly sand

G = gravel

gM = gravelly mud

gmS = gravelly muddy sand

gS = gravelly sand

M = Mud

mG = muddy gravel

mS = muddy sand

msG = muddy sandy gravel

S = sand

sG = sandy gravel

sM = sandy mud


SHEPARDCOD Shepard code; grain size classification
CLAYEY SILT =

SANDY SILT = 

SAND SILT CLAY = 

SILTY CLAY = 

SAND = 

SILTY SAND = 

SEDIMENT = 

CLAYEY SAND = 

CLAY = 

SANDY CLAY = 

SILT = 

GRAVELLY SEDIMENT = 

GRAVEL = 


ROCKMSHP Rock membership; fuzzy membership (%) reflecting percent exposure of rock
-99 = no data


WEEDMSHP Weed membership; fuzzy membership (%) reflecting percent abundance of seaweed and seagrass
-99 = no data


CARBONATE Carbonate, including finest to coarsest sampled fractions

MUNSLCODE Munsell color code

ORGCARBON Organic carbon in the sample

LGSHEARSTR Undrained compressive shear strength, Log10 of KiloPascals
-99 = no data


POROSITY Void volume

PWAVEVEL Compressional wave velocity

LGCRSHST Log Critical Shear Stress, Log10 of Tau in kPa, being the Shear Stress required to initiate easily observable erosion and transport, whether by traction or suspension

SAMPLEPHAS Sample Phase; records whether the results are for the whole, bulk sediment or just to some special part

DESCRIPT Based on SITENAME.

FGDLAQDATE Date FGDL aquired the data from the source.

OBJECTID Internal feature number.

SHAPE Feature geometry.

AUTOID Unique ID added by GeoPlan

Values of -99 for any field are indications that there was no data available.
USER NOTES:
Data in usSEABED are based on the observations and analyses of others, 
filtered through a unifying and mining software. Each source report varies in 
type of information/data recorded and format. Only those observations that are 
recorded can be filtered and mined; only presence (not absence) or information 
can be noted.
Additional useable data may exist in this area; the authors appreciate any information and leads.

The EXT data is usually based on instrumental analyses (probe or laboratory) but may apply to 
just a subsample of the sediment 
(eg. no large shells).
GeoPlan relied on the integrity of the attribute information within
the original data.

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.

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.

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.

THE DATA INCLUDED IN FGDL ARE 'AS IS' AND SHOULD NOT BE CONSTRUED
AS LEGALLY BINDING. THE UNIVERSITY OF FLORIDA GEOPLAN CENTER SHALL
NOT BE LIABLE FOR ANY DAMAGES SUFFERED AS A RESULT OF USING,
MODIFYING, CONTRIBUTING OR DISTRIBUTING THE MATERIALS.

A note about data scale: 

Scale is an important factor in data usage.  Certain scale datasets
are not suitable for some project, analysis, or modeling purposes.
Please be sure you are using the best available data. 

1:24000 scale datasets are recommended for projects that are at the
county level.
1:24000 data should NOT be used for high accuracy base mapping such
as property parcel boundaries.
1:100000 scale datasets are recommended for projects that are at the
multi-county or regional level.
1:125000 scale datasets are recommended for projects that are at the
regional or state level or larger.

Vector datasets with no defined scale or accuracy should be
considered suspect. Make sure you are familiar with your data
before using it for projects or analysis. Every effort has been
made to supply the user with data documentation. For additional
information, see the References section and the Data Source Contact
section of this documentation. For more information regarding
scale and accuracy, see our webpage at:
http://geoplan.ufl.edu/education.html

REFERENCES:
usSEABED: East Coast Offshore Surficial Sediment Data Release, usSEABED Data
http://pubs.usgs.gov/ds/2005/118/htmldocs/usseabed.htm

usSEABED: East Coast Offshore Surficial Sediment Data Release, Frequently Asked Questions
http://pubs.usgs.gov/ds/2005/118/htmldocs/faqs.htm

DATA LINEAGE SUMMARY:
Data was downloaded by GeoPlan from the U.S. Geological
Survey in shapefile format in December 2006.  When received, 
data was in the following projection: GCS North American 1983,
Units: Meters.  

During the QA/QC process the following 
aspects were included:
(1) The original file name, atl_ext.shp, was changed
to seabed_atl_ext_2005.shp
(2) Projected data to FGDL Albers
(3) UPCASED attribute table
(4) All points above latitude 30.887 were deleted
(5) Deleted the following blank fields: ROUGHNESS, SEABEDCLS
(6) Added the DESCRIPT field based upon SITENAME
(7) Added the FGDLAQDATE
Process Date: 20070409

MAP PROJECTION PARAMETERS:

Projection                          ALBERS
Datum                               HPGN
Units                               METERS
Spheroid                            GRS1980
1st Standard Parallel               24  0  0.000
2nd Standard Parallel               31 30  0.000
Central Meridian                   -84 00  0.000
Latitude of Projection's Origin     24  0  0.000
False Easting (meters)              400000.00000
False Northing (meters)             0.00000

DATA SOURCE CONTACT (S):

Name:
Abbr. Name:
Address:


Phone:

Web site:
E-mail:
Contact Person:
         Phone:
        E-mail:
USGS/Univ. of Colorado
384 Woods Hole Rd.
Woods Hole, MA
02543-1598
(508) 548-8700x2204

http://pubs.usgs.gov/ds/2005/118/data/atl_ext.zip jreid@usgs.gov

FGDL CONTACT:
Name:                   FLORIDA GEOGRAPHIC DATA LIBRARY
Abbr. Name:             FGDL
Address:                Florida Geographic Data Library
                        431 Architecture Building
                        PO Box 115706
                        Gainesville, FL  32611-5706
Web site:               http://www.fgdl.org

Contact FGDL: 

      Technical Support:	        http://www.fgdl.org/fgdlfeed.html
      FGDL Frequently Asked Questions:  http://www.fgdl.org/fgdlfaq.html
      FGDL Mailing Lists:		http://www.fgdl.org/fgdl-l.html
      For FGDL Software:                http://www.fgdl.org/software.html