Sediment Grain Size

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: The Nature Conservancy
Publication_Date:
REQUIRED: The date when the data set is published or otherwise made available for release.
Title: Sediment Grain Size
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage: \\MA201-MCLARK\E$\NAMFINALDATA\Benthic\Benthic.gdb
Description:
Abstract:
This data product was created as part of the Northwest Atlantic Marine Ecoregional Assessment. The Nature Conservancy developed this science-based ecoregional assessment for the Northwest Atlantic Marine region (Bay of Fundy to Cape Hatteras, North Carolina). This assessment synthesizes information on oceanography, chemistry, geology, biology, and social science to inform decisions about coastal and marine ecosystems. By integrating this information at a regional level, the Conservancy is able to provide both a greater understanding of the interrelated biological diversity of the marine ecoregion, and a clearer picture of the current condition of its natural areas and the challenges to their continued persistence. The ten categories of targets identified as the primary structure for the marine ecoregional assessment are: coastal and estuarine habitats, benthic habitats, diadromous fish, demersal fish, pelagic fish, forage fish, nearshore shellfish, shorebirds and seabirds, marine mammals, and sea turtles. For more information and a detailed report, please visit <http://nature.org/namera/>.
A sediment surface was created from interpolation of usSEABED's average grainsize.
The source data includers National Geographic Data Center's Coastal Relief Model (CRM), augmented the data with insets from the NOS Bathymetric & Fishing Maps (BFM). The BFM contours were drawn by hand, by cartographers interpreting topography from soundings. The BFM contour maps provide a more credible topography in some of the problematic sections of the CRM.
The Canadian portion of the ecoregion, including the Bay of Fundy, was covered by USGS' Gulf of Maine 15' Bathymetry. Because the spatial resolution of this layer (~350 meter cell size) is coarser than the CRM (~82 m cell size), it was used only to fill in areas north of the Hague line and in a section of eastern Georges Bank. We removed a fringe from the CRM where data had been inferred up to 9 km beyond actual soundings.
Purpose:
usSEABED's averaged grain-size for each sample produced a robust interpretation of sediment texture, showing local variation as well as large-scale patterns. The point samples were interpolated using the Kriging interpolation method in ArcGIS to create surfaces representing the area between sample points at a cell size of 500 meters. We classified grain-size according to organisms' preferences, and assigned names to these classes based on the Wentworth (1922) scheme. To accommodate the various preferences of characteristic organism groups, the classes varied slightly in the three subregions of our study area.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2010
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.322300
East_Bounding_Coordinate: -63.959384
North_Bounding_Coordinate: 45.528541
South_Bounding_Coordinate: 34.908497
Keywords:
Theme:
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Theme_Keyword: usSEABED
Theme_Keyword: sediment
Theme_Keyword: average grain size
Place:
Place_Keyword: Northwest Atlantic
Access_Constraints:
The Nature Conservancy reserves all rights in data provided. All data are provided as is. This is not a survey quality dataset. TNC-derived data analysis cannot be relied on as a definitive statement of the presence or absence of individual species or significant ecological communities at given locations and cannot be substituted for ecological surveys that may be required for environmental assessment or conservation planning. The Nature Conservancy makes no warranty as to the currency, completeness, accuracy or utility of any specific data. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data.
Use_Constraints:
The Nature Conservancy (TNC) compiled this data set from publicly available data sources and this data is freely distributable without permission from this TNC resource office. This data set must be cited on all electronic and hard copy products using the language of the Data Set Credit. Use and analysis of the geographic data are limited by the scale at which the data was collected and mapped, and that, as a regional analysis, it is not intended for site level decisions.
The Nature Conservancy shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any sale, distribution, loan, or offering for use of these digital data, in whole or in part, is prohibited without the approval of the Nature Conservancy. The use of these data to produce other GIS products and services with the intent to sell for a profit is prohibited without the written consent of the Nature Conservancy. All parties receiving these data must be informed of these restrictions. The Nature Conservancy shall be acknowledged as data contributors to any reports or other products derived from these data.
Point_of_Contact:
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Contact_Organization_Primary:
Contact_Organization: Eastern Resource Office of The Nature Conservancy
Contact_Person: Jennifer Greene
Contact_Address:
Address_Type: mailing and physical address
Address: 11 Avenue de Lafayette
Address: 5th Floor
City: Boston
State_or_Province: MA
Postal_Code: 02111-1736
Contact_Voice_Telephone: 617-542-1908
Contact_Electronic_Mail_Address: jgreene@tnc.org
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Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey usSEABED
Publication_Date: 2005
Title: usSEABED EXTracted data for the entire U.S. Atlantic Coast
Other_Citation_Details:
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.
Reid, J.M., Reid, J.A., Jenkins, C.J., Hastings, M.E., Williams, S.J., and Poppe, L.J, 2005, usSEABED: Atlantic coast offshore surficial sediment data release: U.S. Geological Survey Data Series 118, version 1.0. Online at <http://pubs.usgs.gov/ds/2005/118/>
Online_Linkage: <http://walrus.wr.usgs.gov/usseabed/>
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2005
Title: usSEABED Parsed data for the entire U.S. Atlantic Coast
Other_Citation_Details:
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 parsed (PRS) output of the dbSEABED mining software. It contains the results of parsing descriptions in the data resources. The PRS data is less precise because it comes from word-based descriptions, but will include information on outsized elements, consolidation that are not usually in EXT data.
Reid, J.M., Reid, J.A., Jenkins, C.J., Hastings, M.E., Williams, S.J., and Poppe, L.J, 2005, usSEABED: Atlantic coast offshore surficial sediment data release: U.S. Geological Survey Data Series 118, version 1.0. Online at <http://pubs.usgs.gov/ds/2005/118/>
Online_Linkage: <http://pubs.usgs.gov/ds/2005/118/htmldocs/data_cata.htm>
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Point_and_Vector_Object_Count: 13789
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Mercator:
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Entity_and_Attribute_Information:
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Entity_Type_Label: NAM_WM_benthic_sediment
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
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Attribute:
Attribute_Label: ID
Attribute:
Attribute_Label: GRIDCODE
Attribute:
Attribute_Label: SEDIMENT
Attribute:
Attribute_Label: GRPSED
Attribute:
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Attribute_Definition: Length of feature in internal units.
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Attribute_Definition: Area of feature in internal units squared.
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Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Distribution_Information:
Resource_Description: Downloadable Data
Distribution_Liability:
Neither The Nature Conservancy nor any of the ecoregional planning team participants makes any warranty, expressed or implied, as to the use or appropriateness of use of the enclosed data., nor are there warranties of merchantability or fitness for a particular purpose or use. No representation is made as to the currency, accuracy or completeness of the information on this CD-ROM or of the data sources on which it is based. Neither The Nature Conservancy nor any of the ecoregional planning team participants shall be liable for any lost profits or consequential damages, or claims against the user by third parties.
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Generated by mp version 2.9.6 on Mon Jul 26 11:25:55 2010