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.
SMEX03 Soil Climate Analysis Network (SCAN): Georgia, Version 1
This is the most recent version of these data.
initial release
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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].Detailed Data Description
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.
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.
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 |
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 |
Table 4 lists the 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
|
The total data set volume is 268 KB.
Southernmost Latitude: 31.51º N
Northernmost Latitude: 31.51º N
Westernmost Longitude: 83.56º W
Easternmost Longitude: 83.56º W
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.
Parameter Descriptions
Table 5 describes the parameters in the 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.
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
|
Software and Tools
Data files are viewable with a browser or text editor.
Data Acquisition and Processing
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.
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. |
References and Related Publications
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
We would like to acknowledge the USDA Natural Resources Conservation Service (NRCS) http://www.nrcs.usda.gov/.
Document Information
Document Creation Date
June 2006