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Data Set ID:
NSIDC-0294

SMEX03 Soil Climate Analysis Network (SCAN): Georgia, Version 1

This data set contains measurements taken during the Soil Moisture Experiment 2003 (SMEX03) from 1 June 2003 to 31 July 2003 from sensors at the Soil Climate Analysis Network (SCAN) station located in Little River, GA, USA.

This is the most recent version of these data.

Version Summary:

initial release

BASIC Level of Service

Data: Data integrity verified

Documentation: Key metadata and links to supporting documentation available

User Support: Assistance with data access and basic data usage

See All Level of Service Details

Parameter(s):
  • ATMOSPHERIC TEMPERATURE > SURFACE TEMPERATURE > AIR TEMPERATURE
  • PRECIPITATION > PRECIPITATION AMOUNT
  • ATMOSPHERIC WATER VAPOR > WATER VAPOR INDICATORS > HUMIDITY > RELATIVE HUMIDITY
  • SOILS > SOIL MOISTURE/WATER CONTENT
  • SOILS > SOIL TEMPERATURE
  • ATMOSPHERIC RADIATION > SOLAR RADIATION
Data Format(s):
  • ASCII Text
Spatial Coverage:
N: 31.51, 
S: 31.51, 
E: -83.56, 
W: -83.56
Platform(s):GROUND STATIONS
Spatial Resolution:Not SpecifiedSensor(s):ANEMOMETERS, HUMIDITY SENSORS, PYRANOMETERS, RAIN GAUGES, SOIL MOISTURE PROBE, SOIL TEMPERATURE PROBE, THERMISTORS
Temporal Coverage:
  • 1 June 2003 to 31 July 2003
Version(s):V1
Temporal Resolution1 day, 1 hourMetadata XML:View Metadata Record
Data Contributor(s):David Bosch, Garry Schaefer

Geographic Coverage

Download Via HTTPS: An Earthdata Login account is required to access these data.

Once you have logged in, you will be able to click and download files via a Web browser. There are also options for downloading via a command line or client. For more detailed instructions, please see Options Available for Bulk Downloading Data from HTTPS with Earthdata Login.

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.

Bosch, D. and G. Schaefer. 2006. SMEX03 Soil Climate Analysis Network (SCAN): Georgia, 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/TJLY2U5L0D4G. [Date Accessed].

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Detailed Data Description

Format

Data are provided as tab-delimited ASCII. Two types of files are available: hourly and daily. Table 1 displays the station identification number, the station name, and the station location of the SCAN station included in this data set. Please visit http://www.wcc.nrcs.usda.gov/scan for more information on SCAN stations.

Table 1: SMEX03 Georgia SCAN Station Specifications
SCAN Station No. Station Name Location Coordinates (Latitude and Longitude)
2027 Little River Tift County, GA 31.51º N, 83.56º W

Table 2 lists the column headings and definitions in the hourly file, and Table 3 lists the column headings and definitions in the daily file. Please visit http://www.wcc.nrcs.usda.gov/scan/sensors.html for more information on these parameters.

Note: In both files, missing data values are denoted by either -99.9 or -99.99.

Table 2: Column Headings and Definitions for the Hourly File
Column
 Description Units
ATHA6
 Average air temperature degrees Celsius
ATHC6
 Current air temperature degrees Celsius
ATHN6
 Minimum air temperature degrees Celsius
ATHX6
 Maximum air temperature degrees Celsius
c1rdc
 Current soil dielectric constant an two inch depth no units
c1sal
 Current soil salinity at two inch depth grams per liter
c1smv
 Current soil moisture at two inch depth percent water by volume
c1tmp
 Current soil temperature at two inch depth degrees Celsius
c2rdc
 Current soil real dielectric constant at four inch depth no units
c2sal
 Current soil salinity at four inch depth grams per liter
c2smv
 Current soil moisture at four inch depth percent water by volume
c2tmp
 Current soil temperature at four inch depth degrees Celsius
c3rdc
 Current soil real dielectric constant at eight inch depth no units
c3sal
 Current soil salinity at eight inch depth grams per liter
c3smv
 Current soil moisture at eight inch depth percent water by volume
c3tmp
 Current soil temperature at eight inch depth degrees Celsius
c4rdc
 Current real dielectric constant at 20 inch depth no units
c4sal
 Current soil salinity at 20 inch depth grams per liter
c4smv
 Current soil moisture at 20 inch depth percent water by volume
c4tmp
 Current soil temperature at 20 inch depth degrees Celsius
c5rdc
 Current soil real dielectric constant at 40 inch depth no units
c5sal
 Current soil salinity at 40 inch depth grams per liter
c5smv
 Current soil moisture at 40 inch depth percent water by volume
c5tmp
 Current soil temperature at 40 inch depth degrees Celsius
Day
 Day of measurement
Hour
 Hour of measurement Eastern Standard Time (EST)
Month
 Month of measurement
PCPIN
 Cumulative total precipitation inches
RH1C1
 Current relative humidity percent
RH1N1
 Minimum relative humidity percent
RH1X1
 Maximum relative humidity percent
SRHA
 Average solar radiation watts per square meter
WDHA
 Average wind direction degrees from true north
WSPHA
 Average wind speed meters per hour
WSPHX
 Maximum wind speed meters per hour
Year
 Year of measurement

Table 3: Column Headings and Definitions for the Daily File
Column
 Description Units
ATA6
 Average air temperature degrees Celsius
ATN6
 Minimum air temperature degrees Celsius
ATX6
 Maximum air temperature degrees Celsius
Date
 Date of measurement
ENHUM
 Average relative humidity in enclosure percent
Month
 Month of measurement
WDDA
 Average wind direction degrees from true north
WSPDA
 Average wind speed meters per hour
Year
 Year of measurement
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File and Directory Structure

Table 4 lists the files contained in this data set.

Table 4: Files Contained In This Data Set
File Name Description File Size
Scan2027_Hourly.txt This is a tab-delimited ASCII text file of the data in hourly measurements.
265 KB
Scan2027_Daily.txt This is a tab-delimited ASCII text file of the data in daily averages.
2.7 KB
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Volume

The total data set volume is 268 KB.

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Spatial Coverage

Southernmost Latitude: 31.51º N
Northernmost Latitude: 31.51º N
Westernmost Longitude: 83.56º W
Easternmost Longitude: 83.56º W

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Temporal Coverage

Data were collected between 1 June 2003 and 31 July 2003.

Temporal Resolution

Hourly measurements are averages computed as the sum of all measurements taken during an hour divided by the number of measurements taken during that hour. Daily values are averages computed as the sum of all hourly measurements taken during a day divided by the number of hourly measurements taken during that day.

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Parameter or Variable

Parameter Descriptions

Table 5 describes the parameters in the hourly file.

Table 5: Parameters in Hourly File
Parameter Description
Precipitation Current value
Air temperature Maximum, minimum, average, and current values
Relative humidity Maximum, minimum, average, and current values
Wind speed Maximum and average values
Wind direction Averages
Solar radiation Averages
Soil salinity Current values at 2, 4, 8, 20, and 40 inch ground depths
Soil temperature Current values at 2, 4, 8, 20, and 40 inch ground depths
Soil moisture as percent water by volume Current values at 2, 4, 8, 20, and 40 inch ground depths
Soil r eal dielectric constant Current values at 2, 4, 8, 20, and 40 inch ground depths

Table 6 describes the parameters in the daily file.

Table 6: Parameters in Daily File
Parameter Description
Temperature Daily maximum, minimum, and average values
Wind speed Daily average
Wind direction Daily average
Enclosure relative humidity Current value

Sample Data Records

The following sample shows the first four records from the hourly file Scan2027_Hourly.txt. The first six and last six columns are displayed.

Year
Month
Day
Hour
PCPIN
ATHC6
...
c4sal
c4rdc
c5smv
c5tmp
c5sal
c5rdc
2003
6
1
0
33.29
25.81
...
0.1
7.1
26.6
23.92
0.13
14.81
2003
6
1
1
33.29
25.62
...
0.1
7.1
26.36
23.92
0.14
14.66
2003
6
1
2
33.29
25.15
...
0.09
7.24
26.36
23.92
0.14
14.66
2003
6
1
3
33.29
24.22
...
0.1
7.15
26.6
23.92
0.13
14.81

The following sample shows the first four records from the daily file Scan2027_Daily.txt. All nine columns are displayed.

Year
Month
Date
ATX6
ATN6
ATA6
WSPDA
WDDA
ENHUM
2003
6
1
33.14
18.44
26.67
5.1
233.85
59.37
2003
6
2
30.6
17.97
25.37
4.98
326.59
62.1
2003
6
3
32.19
15.73
24.86
2.64
101.36
61
2003
6
4
26.08
20.76
23.54
4.72
180.04
65.4
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Software and Tools

Software and Tools

Data files are viewable with a browser or text editor.

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Data Acquisition and Processing

Sensor or Instrument Description

Each SCAN station houses multiple sensors that automatically record data. These data are uploaded at regular intervals to the NRCS Data Processing Center, Portland, Oregon, USA. Table 7 describes the sensors housed in the SCAN station and the parameters they measure.

Table 7: SCAN Station Sensors and Measured Parameters
Sensor Name Parameters Measured Method of Measurement
Tipping bucket rain gauge
Precipitation
 Cumulative inches of precipitation are recorded.
Shielded thermistor
Air temperature
 The instrument is raised six feet from the surface. Current temperature and the previous hour's maximum, minimum, and average temperatures are recorded.
Soil sensors
Soil moisture, soil temperature, soil salinity
 Sensors are located at depths of 2, 4, 8, 20, and 40 inches below the surface. Current soil moisture, temperature, and salinity are recorded.
Thin film
capacitance-type sensor
Relative humidity
 The sensor is raised six feet from the surface. Current relative humidity and the previous hour's maximum and minimum relative humidities are recorded.
Anemometer
Wind speed, wind direction
 The instrument is raised 10 feet from the surface. Hourly averages are computed from continuous measurements.
Pyranometer
Solar radiation
 The sensor is raised 10 feet from the surface. Hourly average readings of total incoming solar energy are computed.
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References and Related Publications

Please see the NSIDC SMEX Web site to access data.

Contacts and Acknowledgments

David D. Bosch
USDA Agricultural Research Service (ARS) Southeast Watershed Research Laboratory
Tifton, Georgia
USA

Garry Schaefer
USDA Natural Resources Conservation Service (NRCS)
Portland, Oregon
USA

Acknowledgments: 

We would like to acknowledge the USDA Natural Resources Conservation Service (NRCS) http://www.nrcs.usda.gov/.

Document Information

Document Creation Date

June 2006

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