Soft Sediments

Raster Dataset

Tags
Northwest Atlantic, Northwest Atlantic Marine Ecoregional Assessment, Substrate, Sediments, grain size, Topography.


Summary

This dataset was created for the Northwest Atlantic Marine Ecoregional Assessment (NAMERA) in order to map soft sediments based on their grain size (in mm). This version is an update of the original 2010 soft sediments layer using new data and created in September, 2020. 

THIS DATASET WAS NOT CREATED FOR NAVIGATIONAL PURPOSES AND AS SUCH SHOULD NOT BE USED FOR NAVIGATION.

Description

This layer is a result of an interpolation of point based samples compiled from different sources, The sources for the sediment information were a combination of: USGS Sediment Texture Database, USGS's SEABED database, and data from recent NOS surveys. All these were cleaned to remove erroneous and duplicate values. We also removed samples where percentages could not be easily derived. All the points were interpolated using EBK regression prediction tool from ArcGIS’ Geostatistical Analyst, with Bathymetry and BPI at two different scales as covariates. We interpolated three different surfaces: percentage of sand, percentage of mud, percentage of gravel.

We reclassified the resulting surfaces in 3 classes depending on the percentages. For example, for sand: <25% (absence of sand), 25-75% (sand combined with others), >75% (majority sand). Finally, we combined the three distinct sediment layers into one combined layer, with the following classes:

    

  • Dominant sand (over 75% sand)
    • 

  • Dominant mud (over 75% mud)
    • 

  • Dominant gravel (over 75% gravel)
    • 

  • Sand and gravel mixed
    • 

  • Sand and mud mixed
    • 

  • Mud and gravel mixed
    • 

  • Other (three type mixes in different quantities
    • 


Use limitations
These layers were created to provide a regional overview of the type of sediment found across the region. They should not be used for navigation or for local-scale surveys.

These layers are based on interpolations from samples from different sources, so their accuracy depends on the source data. The resulting layers are estimates of actual sediment types, not actual observations. Please consider when the samples were taken and their source to determine accuracy of the values for each location.
Extent
West -78.557097   East -62.944377
North 46.858247   South 31.451057
Scale Range
Maximum (zoomed in) 1:5,000
Minimum (zoomed out) 1:150,000,000
ArcGIS Metadata ▼►
Topics and Keywords 
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* Content type 
				Downloadable Data


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Citation 
			▼►
* Title soft_sediment.img


Presentation formats 
	    * digital map


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Resource Details 
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Dataset languages 
	* English (UNITED STATES)
				


Spatial representation type 
	    * grid


* Processing environment Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1.4959


Credits
Anderson, M. G., Greene, J., Morse, D., Shumway, D. and Clark, M (2010) Benthic Habitats of the Northwest Atlantic in  Greene, J.K., M.G. Anderson, J. Odell, and N. Steinberg, eds. The Northwest Atlantic Marine Ecoregional Assessment: Species, Habitats and Ecosystems. Phase One. The Nature Conservancy, Eastern U.S. Division, Boston, MA.

ArcGIS item properties 

* Name soft_sediment.img
* Location file://D:\K_mirror\ecoreg\NW_Atl_Marine\physio\soft_sediment.img
* Access protocol Local Area Network

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Extents 
				▼►
Extent 

Geographic extent 

Bounding rectangle 

Extent type 
Extent used for searching
* West longitude -78.557097
* East longitude -62.944377
* North latitude 46.858247
* South latitude 31.451057
* Extent contains the resource Yes

Extent in the item's coordinate system 

* West longitude -8744936.028954
* East longitude -7006936.028954
* South latitude 3691467.026059
* North latitude 5918967.026059
* Extent contains the resource Yes

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Resource Constraints 
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Constraints 

Limitations of use
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. 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.

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Spatial Reference 
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ArcGIS coordinate system 

* Type Projected
* Geographic coordinate reference GCS_WGS_1984
* Projection WGS_1984_Web_Mercator_Auxiliary_Sphere
* Coordinate reference details 

Projected coordinate system 

Well-known identifier 102100
X origin -20037700
Y origin -30241100
XY scale 148923141.92838538
Z origin -100000
Z scale 10000
M origin -100000
M scale 10000
XY tolerance 0.001
Z tolerance 0.001
M tolerance 0.001
High precision true
Latest well-known identifier 3857
Well-known text PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator_Auxiliary_Sphere"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],PARAMETER["Auxiliary_Sphere_Type",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",3857]]

Reference system identifier 

* Value 3857
* Codespace EPSG
* Version 8.6.2


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Spatial Data Properties 
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Georectified Grid 
▼►
* Number of dimensions 2


Axis dimensions properties 

Dimension type 
				column (x-axis)
* Dimension size 3476
* Resolution 
500.000000 m (meter)

Axis dimensions properties 

Dimension type 
				row (y-axis)
* Dimension size 4455
* Resolution 
500.000000 m (meter)

* Cell geometry 
			area
* Point in pixel 
			center


* Transformation parameters are available Yes


* Check points are available No


Corner points 

* Point -8744936.028954 3691467.026059
* Point -8744936.028954 5918967.026059
* Point -7006936.028954 5918967.026059
* Point -7006936.028954 3691467.026059

* Center point -7875936.028954 4805217.026059


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ArcGIS Raster Properties 

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General Information 

* Pixel depth 32
* Compression type RLE
* Number of bands 1
* Raster format IMAGINE Image
* Source type continuous
* Pixel type floating point
* No data value -3.4028231e+038
* Has colormap No
* Has pyramids Yes


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Spatial Data Content 
				▼►
Image Description 

* Type of information 
			image


Band information 

* Description Layer_1
* Maximum value 5.656854
* Minimum value 0.000308
* Number of bits per value 32


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Distribution 
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Distribution format 

* Name Raster Dataset


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Metadata Details 
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* Metadata language English (UNITED STATES)
			
* Metadata character set 
			utf8 - 8 bit UCS Transfer Format


Scope of the data described by the metadata 
	    * dataset
Scope name 
	    * dataset


* Last update 2021-11-15


ArcGIS metadata properties
Metadata format ArcGIS 1.0
Metadata style Item Description
Standard or profile used to edit metadata ItemDescription


Created in ArcGIS for the item 2016-05-03 11:12:13
Last modified in ArcGIS for the item 2016-05-20 16:12:13


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Thumbnail and Enclosures 
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Thumbnail 

Thumbnail type 
JPG

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