This data set contains measurements taken during the Soil Moisture Experiment 2003 (SMEX03) from sensors at Soil Climate Analysis Network (SCAN) stations located in Fort Reno and Little Washita, OK, USA.
SMEX03 Soil Climate Analysis Network (SCAN): Oklahoma, Version 1
This is the most recent version of these data.
initial release
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Jackson, T. and M. Cosh. 2006. SMEX03 Soil Climate Analysis Network (SCAN): Oklahoma, 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/PDDQ8CUTFGJ5. [Date Accessed].Detailed Data Description
Data are provided as tab-delimited ASCII text. Two types of files are available for each station: hourly and daily. Table 1 displays the station identification number, the station name, and the station location for the SCAN stations whose data are part of this data set. More information on SCAN stations is posted at http://www.wcc.nrcs.usda.gov/scan.
SCAN Station No. |
Station Name |
Location |
Coordinates (Latitude and Longitude) |
---|---|---|---|
2022 |
Fort Reno |
Canadian County, OK |
35.55º N, 98.02º W |
2023 |
Little Washita |
Grady County, OK |
34.95º N, 97.98º W |
Table 2 lists the column headings and definitions in the hourly files, and Table 3 lists the column headings and definitions in the daily files. More information on these parameters can be found at http://www.wcc.nrcs.usda.gov/scan/sensors.html.
Note 1: In both files, missing data values are denoted by either -99.9 or -99.99.
Note 2: Not all parameters listed are measured at every station.
Column | Description | Units | SCAN Station No. | |
---|---|---|---|---|
2022 | 2023 | |||
ATHA6 |
Average air temperature | degrees Celsius |
x |
x |
ATHC6 |
Current air temperature | degrees Celsius |
x |
x |
ATHN6 |
Minimum air temperature | degrees Celsius |
x |
x |
ATHX6 |
Maximum air temperature | degrees Celsius |
x |
x |
BAD |
Bad data |
x |
||
BPHGC |
Current barometric pressure | inches of mercury (Hg) |
x |
x |
c1rdc |
Current soil dielectric constant an two inch depth | no units |
x |
x |
c1sal |
Current soil salinity at two inch depth | grams per liter |
x |
x |
c1smv |
Current soil moisture at two inch depth | percent water by volume |
x |
x |
c1tmp |
Current soil temperature at two inch depth | degrees Celsius |
x |
x |
c2rdc |
Current soil real dielectric constant at four inch depth | no units |
x |
x |
c2sal |
Current soil salinity at four inch depth | grams per liter |
x |
x |
c2smv |
Current soil moisture at four inch depth | percent water by volume |
x |
x |
c2tmp |
Current soil temperature at four inch depth | degrees Celsius |
x |
x |
c3rdc |
Current soil real dielectric constant at eight inch depth | no units |
x |
x |
c3sal |
Current soil salinity at eight inch depth | grams per liter |
x |
x |
c3smv |
Current soil moisture at eight inch depth | percent water by volume |
x |
x |
c3tmp |
Current soil temperature at eight inch depth | degrees Celsius |
x |
x |
c4rdc |
Current soil real dielectric constant at 20 inch depth | no units |
x |
x |
c4sal |
Current soil salinity at 20 inch depth | grams per liter |
x |
x |
c4smv |
Current soil moisture at 20 inch depth | percent water by volume |
x |
x |
c4tmp |
Current soil temperature at 20 inch depth | degrees Celsius |
x |
x |
c5rdc |
Current soil real dielectric constant at 40 inch depth | no units |
x |
x |
c5sal |
Current soil salinity at 40 inch depth | grams per liter |
x |
x |
c5smv |
Current soil moisture at 40 inch depth | percent water by volume |
x |
|
c5tmp |
Current soil temperature at 40 inch depth | degrees Celsius |
x |
x |
Date |
Date of measurement |
x |
x |
|
Hour |
Hour of measurement | Central Standard Time (CST) |
x |
x |
Month |
Month of measurement |
x |
x |
|
PCPIN |
Current precipitation | inches |
x |
|
RH1C1 |
Current relative humidity | percent |
x |
x |
RH1N1 |
Minimum relative humidity | percent |
x |
x |
RH1X1 |
Maximum relative humidity | percent |
x |
x |
SLRHA |
Average solar radiation | watts per square meter |
x |
|
SRHA |
Average solar radiation | watts per square meter |
x |
|
STC1C |
Current soil temperature at two inch depth | degrees Celsius |
x |
x |
STC2C |
Current soil temperature at four inch depth | degrees Celsius |
x |
x |
STC3C |
Current soil temperature at eight inch depth | degrees Celsius |
x |
x |
STC4C |
Current soil temperature at 20 inch depth | degrees Celsius |
x |
x |
STC5C |
Current soil temperature at 40 inch depth | degrees Celsius |
x |
x |
WDHA |
Average wind direction | degrees |
x |
x |
WSPHA |
Average wind speed | meters per hour |
x |
x |
WSPHX |
Maximum wind speed | meters per hour |
x |
x |
Year |
Year of measurement |
x |
x |
Column | Description | Units | SCAN Station No. | |
---|---|---|---|---|
2022 | 2023 | |||
ATA6 |
Average air temperature | degrees Celsius | x | x |
ATN6 |
Minimum air temperature | degrees Celsius | x | x |
ATX6 |
Maximum air temperature | degrees Celsius | x | x |
Date |
Date of measurement | x | x | |
ENHUM |
Average relative humidity in enclosure | percent | x | x |
Month |
Month of measurement | x | x | |
Year |
Year of measurement | x | x | |
WDDA |
Average wind direction | degrees | x | x |
WSPDA |
Average wind speed | meters per hour | x | x |
Table 4 lists the files contained in this data set.
File Name | Description | File Size |
---|---|---|
SCANxxxx_Hourly.txt |
These are tab-delimited ASCII text files of the data in hourly measurements, where xxxx is the SCAN station identification number. |
320 KB |
SCANxxxx_Daily.txt |
These are tab-delimited ASCII text files of the data in daily averages, where xxxx is the SCAN station identification number. |
2.8 KB |
The total data set volume is 656 KB.
Southernmost Latitude: 34.95º N
Northernmost Latitude: 35.55º N
Westernmost Longitude: 98.02º W
Easternmost Longitude: 97.98º 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 files.
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 temperature | Current values at 2, 4, 8, 20, and 40 inch ground depths |
Percent water by volume | Current values at 2, 4, 8, 20, and 40 inch ground depths |
Real dielectric constant | Current values at 2, 4, 8, 20, and 40 inch ground depths |
Table 6 describes the parameters in the daily files.
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 five records from the hourly file Scan2022_Hourly.txt
. The first six and last six columns are displayed.
Year |
Month |
Date |
Hour |
ATHC6 |
ATHX6 |
... |
c5sal |
STC1C |
STC2C |
STC3C |
STC4C |
STC5C |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2003 |
6 |
1 |
0 |
16.68 |
16.75 |
... |
0.29 |
19.24 |
20.02 |
19 |
17.39 |
17.44 |
2003 |
6 |
1 |
1 |
15.68 |
16.83 |
... |
0.29 |
19.07 |
19.9 |
18.97 |
17.44 |
17.41 |
2003 |
6 |
1 |
2 |
14.55 |
15.75 |
... |
0.3 |
18.9 |
19.83 |
18.93 |
17.44 |
17.44 |
2003 |
6 |
1 |
3 |
13.21 |
14.6 |
... |
0.3 |
18.73 |
19.76 |
18.9 |
17.44 |
17.44 |
The following sample shows the first five records from the daily file Scan2022_Daily.txt
. All nine columns are displayed.
Year |
Month |
Date |
ATX6 |
ATN6 |
ATA6 |
WSPDA |
WDDA |
ENHUM |
---|---|---|---|---|---|---|---|---|
2003 |
6 |
1 |
26.67 |
15.34 |
21.49 |
9.58 |
41.32 |
59.17 |
2003 |
6 |
2 |
28.91 |
12.14 |
21.51 |
7.33 |
115.43 |
58.19 |
2003 |
6 |
3 |
27.4 |
17.53 |
22.1 |
8 |
333.63 |
59.1 |
2003 |
6 |
4 |
27.18 |
15.02 |
19.85 |
6.71 |
78.95 |
60.15 |
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 each SCAN station and the parameters they measure.
Sensor Name |
Parameters Measured |
Method of Measurement |
---|---|---|
Global precipitation sensor |
Precipitation |
Daily 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 |
Sensors are located at depths of 2, 4, 8, 20, and 40 inches below the surface. Current soil moisture and temperature are recorded. |
Thin film |
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. |
Silicon capacitive pressure sensor |
Barometric pressure |
Hourly barometric pressure is recorded. |
References and Related Publications
Contacts and Acknowledgments
Thomas J. Jackson
USDA Agricultural Research Service (ARS) Hydrology and Remote Sensing Laboratory
Beltsville, Maryland
USA
Michael H. Cosh
USDA ARS Hydrology and Remote Sensing Laboratory
Beltsville, Maryland
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