Data Set ID: 
SV08ST

SMAPVEX08 Soil Texture Data, Version 1

This data set contains soil texture data that were extracted from a multi-layer soil characteristics database for the conterminous United States and generated for each regional study area. Data are representative of the conditions present in the regional study areas during the general timeline of the Soil Moisture Active Passive Validation Experiment 2008 (SMAPVEX08) campaign.

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Geographic Coverage

Parameter(s):
  • Soils > Soil Water Holding Capacity > Available water capacity
  • Soils > Soil Bulk Density > Bulk Density
  • Soils > Soil Classification > Percent clay
  • Soils > Soil Classification > Percent sand
  • Soils > Soil Porosity > Permeability
  • Soils > Soil Classification > Rock fragment class
Spatial Coverage:
  • N: 39.09, S: 38.93, E: -75.55, W: -76.25

Spatial Resolution:
  • 100 x 100
Temporal Coverage:
  • 1 October 2008 to 31 October 2008
Temporal Resolution: Varies
Data Format(s):
  • Binary
Platform(s) Models/Analyses
Sensor(s): CONUS-Soil
Version: V1
Data Contributor(s): Cosh, M.

Data Citation

As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Cosh, M. 2015. SMAPVEX08 Soil Texture Data, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/4R2T2E348XG4. [Date Accessed].

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Detailed Data Description

This data set contains soil texture data that were extracted from a multi-layer soil characteristics database for the conterminous United States and generated for each regional study area. Data are representative of the conditions present in the regional study area during the general timeline of the Soil Moisture Active Passive Validation Experiment 2008 (SMAPVEX08) campaign.

Format

Data are provided in flat binary files with associated Extensible Markup Language (XML) metadata files.

The binary files are arranged as follows:

Columns: 920
Rows: 600
Pixel Size: 100 meters
In Universal Transverse Mercator (UTM) Coordinates, Zone 18 N, North American Datum 1983 (NAD-83):
Easting Lower Left Corner 377,0000 meters
Northing Lower Left Corner 4,290,000 meters

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File and Directory Structure

Data files are available at: 

https://n5eil01u.ecs.nsidc.org/SMAP_VAL/SV08ST.001/

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File Naming Convention

Along with the data set ID and campaign name (SV08ST_SMAPVEX08), file names contain an abbreviated parameter designation as follows:

Table 1. File Naming Conventions
Parameter Description
bd bulk density
awc available water capacity
poros porosity
perm permeability
sand percent sand
clay percent clay
rvol rock fragment volume
dfc rock fragment class

With the exception of available water capacity (awc), file names also include a number which designates one of four soil layers, as listed in Table 2. There is only one awc file; available water capacity was computed for the top 100 cm from the surface.

Table 2. File Naming Conventions
Variable Description
1 0-5 cm
2 5-10 cm
3 10-20 cm
4 20-30 cm
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File Size

Files range in size from approximately 0.5 to 2.1 MB per file.

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Volume

The total volume for this data set is approximately 35 MB.

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Spatial Coverage

Southernmost Latitude: 38.93°N
Northernmost Latitude: 39.09°N
Westernmost Longitude: 76.25°W
Easternmost Longitude: 75.55°W

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Spatial Resolution

100 m

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Projection

UTM 18 N (NAD83)

Grid Description

Rectangular grid, 100 m by 100 m

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Temporal Coverage and Resolution

These data are representative of the conditions to be expected in the US regional study area during the approximate timeline of the SMAPVEX08 campaign, October 2008. Thus, temporal coverage and resolution varies by parameter. Data were obtained from a long-term database of soil texture for the conterminous United States called CONUS-Soil. Visit the Soil Information for Environmental Modeling and Ecosystem Management for more information.

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Parameter or Variable

Available Water Capacity: Values given as volumetric percent, computed for a column length of 100 cm, measured from the surface.

Bulk Density: Values given as mean bulk density.

Permeability: Values given as mean permeability rate, in cm/hr.

Porosity: Values given as mean porosity.

Rock Fragment Classification: Values given in code ranging from 0-15 that represent a fragment class:

  • 0, No data
  • 1, Bouldery
  • 2, Cobbly
  • 3, Channery
  • 4, Cherty
  • 5, Flaggy
  • 6, Gravelly
  • 7, Rubbly
  • 8, Shaly
  • 9, Stony
  • 10, Slaty
  • 11, Organic Materials
  • 12, Water
  • 13, Bedrock
  • 14, No Rock Fragments
  • 15, Other

Rock Fragment Volume: Values given as percent of rock by volume.

Texture/Percent Sand: Values given as percent sand.

Texture/Percent Clay: Values given as percent clay.

Parameter Range

Valid parameter values are as follows:

  • Available Water Capacity: 0-100%
  • Bulk Density: 0-3 g/cm3
  • Permeability: 0-10 cm/hr
  • Porosity: 0-1
  • Rock Fragment Classification: 0-15
  • Rock Fragment Volume: 0-100%
  • Texture/Percent Sand: 0-100%
  • Texture/Percent Clay: 0-100%

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Software and Tools

ArcView, ENVI, or other similar software packages are appropriate tools for viewing the binary data.

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Data Acquisition and Processing

These soil data were retrieved from an online database hosted by the Earth System Science Center in the College of Earth and Mineral Sciences at The Pennsylvania State University, at http://www.soilinfo.psu.edu. The data are from CONUS-Soil, a multi-layer soil characteristics data set for the conterminous United States.

Error Sources

The usage of two scenes, both acquired before the campaign, causes additional error to the classification.

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Quality Assessment

The quality of the classification is not high due to the effect of the error sources as specified below

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Contacts and Acknowledgments

Michael H. Cosh
United States Department of Agriculture - Agricultural Research Service (USDA ARS) 
Hydrology and Remote Sensing Laboratory
10300 Baltimore Avenue
Bldg. 007, Rm. 104
BARC-West
Beltsville, MD 20705

Acknowledgments: 

Maryland and Delaware soil data were retrieved from an online database hosted by the Earth System Science Center in the College of Earth and Mineral Sciences at The Pennsylvania State University, at http://www.soilinfo.psu.edu. The data are from CONUS-SOIL, a multi-layer soil characteristics data set for the conterminous United States.

Document Information

DOCUMENT CREATION DATE

June 2015

DOCUMENT REVISION DATE

N/A

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