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Value | Definition |
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G | The end-member texture (= or > 90%) Gravel (G) is the primary texture. |
Gs | The dominant texture (> 50%) Gravel (G) is given the upper case letter and the subordinate texture (< 50%) sand (s) is given a lower case letter. |
S | The end-member texture (= or > 90%) Sand (S) is the primary texture. |
Sg | The dominant texture (> 50%) Sand (S) is given the upper case letter and the subordinate texture (< 50%) gravel (g) is given a lower case letter. |
Sm | The dominant texture (> 50%) Sand (S) is given the upper case letter and the subordinate texture (< 50%) mud (m) is given a lower case letter. |
Ms | The dominant texture (> 50%) Mud (M) is given the upper case letter and the subordinate texture (< 50%) sand (s) is given a lower case letter. |
Rg | The dominant texture (> 50%) Rock (R) is given the upper case letter and the subordinate texture (< 50%) gravel (g) is given a lower case letter. |
Rs | The dominant texture (> 50%) Rock (R) is given the upper case letter and the subordinate texture (< 50%) sand (s) is given a lower case letter. |
Gr | The dominant texture (> 50%) Gravel (G) is given the upper case letter and the subordinate texture (< 50%) rock (r) is given a lower case letter. |
Sr | The dominant texture (> 50%) Sand (S) is given the upper case letter and the subordinate texture (< 50%) rock (r) is given a lower case letter. |
Value | Definition |
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1 | Sediment texture regions that were defined on the basis of the highest resolution bathymetry (10m) and backscatter (1m), bottom photos, sediment samples with laboratory analysis, and seismic interpretations were given the highest data interpretation confidence value of 1. |
2 | Sediment texture regions that were defined on the basis of the highest resolution bathymetry (10m), backscatter (1m), and seismic data, and possibly bottom photos and/or qualitative descriptions of sediment samples, but no sediment samples with laboratory analysis were given the data interpretation confidence value of 2 |
3 | Sediment texture regions that were defined on the basis of the highest resolution bathymetry (10m) and backscatter (1m), possibly bottom photos, and possibly sediment samples with laboratory analysis and/or qualitative descriptions, but no seismic interpretations were given the data interpretation confidence value of 3. |
4 | Sediment texture regions that were defined on the basis of the highest resolution bathymetry (10m) and/or lidar bathymetry, possibly bottom photos, and possibly sediment samples with laboratory analysis and/or qualitative descriptions, but no acoustic backscatter or seismic interpretations were given the data interpretation confidence value of 4. |
5 | Sediment texture regions that were defined on the basis of low-resolution leadline and/or single beam bathymetry, possibly bottom photos, and possibly sediment samples with laboratory analysis and/or qualitative descriptions were given the lowest data interpretation confidence value of 5. |
Value | Definition |
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sand | Sediment whose primary component (> 50%) is sand |
hardbottom | Sediment whose primary component is rock, boulder, cobble, or coarse gravel |
mud | Sediment whose primary component (> 50%) is silt and clay |
Value | Definition |
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coarse gravel | sediment class whose phi size is between -4 and -5 |
coarse silt | sediment class whose phi size is between 4 and 5 |
coarse sand | sediment class whose phi size is between 0 and 1 |
cobble | sediment class whose phi size is between -6 and -8 |
fine gravel | sediment class whose phi size is between -2 and -3 |
fine sand | sediment class whose phi size is between 2 and 3 |
fine silt | sediment class whose phi size is between 6 and 7 |
medium gravel | sediment class whose phi size is between -3 and -4 |
medium sand | sediment class whose phi size is between 2 and 1 |
medium silt | sediment class whose phi size is between 5 and 6 |
very coarse gravel | sediment class whose phi size is between -5 and -6 |
very coarse sand | sediment class whose phi size is between 0 and -1 |
very fine gravel | sediment class whose phi size is between -1 and -2 |
very fine sand | sediment class whose phi size is between 3 and 4 |
very fine silt | sediment class whose phi size is between 7 and 8 |
-999 | sediment class whose phi size could not be determined from grain size data or there were no samples with laboratory analyzed grain size statistics within the polygon |
Range of values | |
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Minimum: | 0.000001 |
Maximum: | 90.567 |
Units: | square kilometers |
Resolution: | 0.000001 |
Range of values | |
---|---|
Minimum: | 0 |
Maximum: | 52 |
Units: | count |
Resolution: | 1 |
Range of values | |
---|---|
Minimum: | 0 |
Maximum: | 70.88 |
Units: | percent |
Range of values | |
---|---|
Minimum: | 11.50 |
Maximum: | 100 |
Units: | percent |
Range of values | |
---|---|
Minimum: | 0 |
Maximum: | 66.49 |
Units: | percent |
Range of values | |
---|---|
Minimum: | 0 |
Maximum: | 22.14 |
Units: | percent |
Range of values | |
---|---|
Minimum: | -2.28 |
Maximum: | 6.63 |
Units: | phi |
Resolution: | 0.01 |
Range of values | |
---|---|
Minimum: | -32.95 |
Maximum: | -1.37 |
Units: | meters |
Resolution: | 0.01 |
These sea floor sediment cover data were created from geophysical and sample data collected from Vineyard and western Nantucket Sounds, and are used to characterize the sea floor in the area. Sediment type and distribution maps are important data layers for marine resource managers charged with protecting fish habitat, delineating marine boundaries, and assessing environmental change due to natural or human impacts.
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Are there legal restrictions on access or use of the data?Access_Constraints: None
Use_Constraints:Not to be used for navigation. 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. Additionally, there are limitations associated with qualitative sediment mapping interpretations. Because of the scale of the source geophysical data and the spacing of samples, not all changes in sea floor texture are captured. The data were mapped between 1:5,000 and 1:20,000, but the recommended scale for application of these data is 1:25,000.
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government
Data format: | WinZip v. 14.5 file contains qualitatively derived polygons that define sea floor texture and distribution from Vineyard and western Nantucket Sounds, MA and the associated metadata. in format Shapefile (version ArcMap 9.3.1) Esri Polygon Shapefile Size: 1.16 |
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Network links: |
http://pubs.usgs.gov/of/2016/1119/GIS_catalog/SedimentTexture/VineyardNantucketSound_sedcover.zip http://pubs.usgs.gov/of/2016/1119/ofr20161119_data_catalog.html |
These data are available in Environmental Systems Research Institute (Esri) shapefile format. The user must have software capable of importing and processing this data type.