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Data Set ID:
NSIDC-0339

SMEX03 Ancillary Soil Characteristics Data, Alabama, Version 1

The SMEX03 Ancillary Soil Characteristics data set contains data for the regional study areas of Alabama, Georgia, and Oklahoma, USA as part of the 2003 Soil Moisture Experiment (SMEX03). The original data were extracted from a multi-layer soil characteristics database for the conterminous United States and generated using Environmental Systems Research Institute (ESRI) ArcMap software for each regional study area.

Geographic Coverage

Parameter(s):
  • Soils > Soil Bulk Density
  • Soils > Soil Classification
  • Soils > Soil Moisture/Water Content
  • Soils > Soil Porosity
  • Soils > Soil Respiration
  • Soils > Soil Texture
Spatial Coverage:
  • N: 35.19, S: 34.66, E: -87.08, W: -87.77

Spatial Resolution: Not Specified
Temporal Coverage:
  • 1 June 2003 to 31 July 2003
Temporal Resolution: Not specified
Data Format(s):
  • ASCII Text
Platform(s) Not specified
Sensor(s): Not specified
Version: V1
Data Contributor(s): Michael Cosh
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. and J. Birch. 2008. SMEX03 Ancillary Soil Characteristics Data, Alabama, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: http://dx.doi.org/10.5067/R2SH2UNZ3D0U. [Date Accessed].

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Detailed Data Description

Format

Data are provided in ArcInfo ASCII Grid data files. The first six rows of each file contain header information, while the following rows contain the actual grid data. Refer to Table 2 for clarification of ASCII Grid header variables, or to the Sample Record section of this document to view the sample data record. Missing data are represented by -9999. The image dimensions for each regional study area are described in Table 1.

Table 1. Study Area Image Dimensions
Alabama 1920 rows by 4000 columns
Georgia 3432 rows by 1855 columns
Oklahoma 600 rows by 2080 columns
Table 2. ArcInfo ASCII Grid Header Values
Variable Description
ncols Number of columns in the grid
nrows Number of rows in the grid
xllcorner Western edge of the grid
yllcorner Southern edge of the grid
cellsize Spatial resolution of the grid
NODATA_value Refers to value representing missing data, such as -9999

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File and Directory Structure

The top directory level contains subdirectories for each SMEX03 study region and the readme.txt file, as shown in Figure 1.

Figure 1. Top Level Directory Structure of SMEX03 Ancillary Data

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File Naming Convention

The soil text files for each data set are named according to the following convention and as described in Table 3.

File Naming Convention:
rg_ppd.txt

File Name Example:
al_bd1.txt

Table 3. Description of File Name Variables
Variable Description
rg Regional Study Areas (al: Alabama; ga: Georgia; on: Oklahoma North; os: Oklahoma South)
pp
Parameter Abbreviation Parameter Description
awc Available Water Capacity
bd Bulk Density
poros Porosity
perm Permeability
sand Sand
clay Clay
rvol Rock Fragment Volume
dtc Dominant Textural Code
rfc Rock Fragment Class
d
Depth Code Depth from soil surface
1 0 - 5 cm
2 5 - 10 cm
3 10 - 20 cm
4 20 - 30 cm
Note: Files containing awc data do not include a depth code in the file name as in the file al_awc100.txt, for example, where 100 denotes cm rather than depth code value. There is only one awc file for each regional study area. AWC was computed for the top 100 cm from the surface.
.txt Indicates that this is a text file.

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File Size

File sizes for each region are described below:

Alabama

There are 33 ASCII text files containing Alabama soil data that range from 10 to 26 MB each, for a total of approximately 850 MB.

Georgia

There are 32 ASCII text files containing Georgia soil data that range from 10 to 26 MB each, for a total of 680 MB.

Oklahoma

There are 66 ASCII text files containing Oklahoma soil data that range from 10 to 26 MB each, for a total of 1380 MB.

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Volume

Total volume is approximately 2.8 GB for all data. Volume by region is approximately:

Alabama: 850 MB

Georgia: 680 MB

Oklahoma: 1380 MB

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Spatial Coverage

This data set covers the regional study areas as referenced by the following:

Alabama

Southernmost Latitude: 34.668845602° N
Northernmost Latitude: 35.194353404° N
Westernmost Longitude: 87.777562595° W
Easternmost Longitude: 87.087325703° W

Georgia

Southernmost Latitude: 30.961064855° N
Northernmost Latitude: 31.903257457° N
Westernmost Longitude: 83.970846870° W
Easternmost Longitude: 83.36425277° W

Oklahoma North

Southernmost Latitude: 36.107428397 ° N
Northernmost Latitude: 36.871048244 ° N
Westernmost Longitude: 98.394729898 ° W
Easternmost Longitude: 97.418165280 ° W

Oklahoma South

Southernmost Latitude: 34.443677450 ° N
Northernmost Latitude: 35.422765186 ° N
Westernmost Longitude: 98.046657639° W
Easternmost Longitude: 97.700276141 ° W

Spatial Resolution

The pixel size is 30 m by 30 m.

Projection and Grid Description

The projection is the Universal Transverse Mercator (UTM) with the World Geodetic System 1984 Datum (WGS 84) applied. The UTM zones for each regional study area are listed in Table 4.

Table 4. UTM Zones of Study Areas
Alabama Zone 16
Georgia Zone 17
Oklahoma Zone 14
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Temporal Coverage

While the United States SMEX03 campaign took place in Alabama, Georgia, and Oklahoma between June 23 and July 18, 2003, these Ancillary Soil Characteristics data are representative of the conditions to be expected in the US regional study areas during the approximate timeline of the SMEX03 campaign.

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Parameter or Variable

Parameters for each data set include the following and are further described in Table 5:

  • Available Water Capacity
  • Bulk Density
  • Permeability
  • Porosity
  • Rock Fragment Class
  • Rock Fragment Volume
  • Percent Sand
  • Percent Clay
  • Texture Class

Parameter Range

Parameters and respective parameter ranges for the Alabama, Georgia, and Oklahoma data files are described in Table 5.

Table 5. Parameter Description
Parameters Values Given As
Available Water Capacity Volumetric percent, computed for a column length of 100 cm, measured from the surface of the soil
Bulk Density Mean bulk density (g/cm3) of soil
Permeability Mean permeability rate (cm/hr) of soil
Porosity Mean porosity (g/cm3) of soil
Rock Fragment Class
Rock Fragment Class Code Description
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 Percent of rock by volume in soil
Percent Sand Percent of sand in soil
Percent Clay Percent of clay in soil
Texture Class
Texture Class Code Description
0 No Data
1 Sand
2 Loamy Sand
3 Sandy Loam
4 Silt Loam
5 Silt
6 Loam
7 Sandy Clay Loam
8 Silty Clay Loam
9 Clay Loam
10 Sandy Clay
11 Silty clay
12 Clay
13 Organic Materials
14 Water
15 Bedrock
16 Other

Sample Data Record

Figure 2 displays a partial sample of the data file al_bd1.txt containing Alabama bulk density data. The first six rows display ArcInfo ASCII Grid header information, while the last six rows contain mean bulk density measurements, of which, only the first thirteen columns are shown in this sample. For clarification of ASCII Grid header variables, refer to Table 2 in the Format section.

Figure 2 . Sample Data Record
ncols 4000
nrows 1920
xllcorner 492000
yllcorner 3837000
cellsize 30
NODATA_value -9999
1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 ...
1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 ...
1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 ...
1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 ...
1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 ...
1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 1.47 ...
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Software and Tools

No special tools are required to view these data.

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Data Acquisition and Processing

Data Acquisition Methods

Alabama, Georgia, and Oklahoma ancillary soil characteristics data were retrieved from the Soil Information for Environmental Modeling and Ecosystem Management database hosted by the Earth System Science Center at Pennsylvania State University. The data for the regional study areas were retrieved from a multi-layer soil characteristics data set for the conterminous United States, called CONUS-SOIL. The data were then exported with ESRI ArcMap and exported as ASCII Grid data files.

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References and Related Publications

Contacts and Acknowledgments

Michael H. Cosh
HydrologyRemote Sensing Laboratory
US Department of Agriculture (USDA) - Agricultural Research Service (ARS)
Bldg. 007, Rm. 104, BARC-West
Beltsville, MD 20705 USA

Joanna Birch
Hydrology/Remote Sensing Laboratory
US Department of Agriculture (USDA) - Agricultural Research Service (ARS)
Bldg. 007, Rm. 104, BARC-West
Beltsville, MD 20705 USA

Acknowledgments: 

The investigators thank the Earth System Science Center at Pennsylvania State University for providing the data used in this data set through the Soil Information for Environmental Modeling and Ecosystem Management database.

Document Information

DOCUMENT CREATION DATE

May 2008

DOCUMENT REVISION DATE

No technical references available for this data set.
No FAQs or How Tos available for this data set.

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