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Data Set ID:
NSIDC-0295

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

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.

Geographic Coverage

Parameter(s):
  • Atmospheric Temperature > Air Temperature
  • Soils > Electrical Conductivity
  • Atmospheric Water Vapor > Humidity
  • Atmospheric Radiation > Incoming Solar Radiation
  • Land Temperature > Land Surface Temperature
Spatial Coverage:
  • N: 35.55, S: 34.95, E: -97.98, W: -98.02

Spatial Resolution: Not Specified
Temporal Coverage:
  • 1 June 2003 to 31 July 2003
Temporal Resolution: 1 hour, 1 day
Data Format(s):
  • ASCII Text
Platform(s) GROUND STATIONS
Sensor(s): ANEMOMETERS, HUMIDITY SENSORS, PRESSURE SENSORS, PYRANOMETERS, RAIN GAUGES, SOIL MOISTURE PROBE, SOIL TEMPERATURE PROBE, THERMISTORS
Version: V1
Data Contributor(s): Thomas Jackson, 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.

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: http://dx.doi.org/10.5067/PDDQ8CUTFGJ5. [Date Accessed].

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Detailed Data Description

Format

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.

Table 1: SMEX03 Oklahoma SCAN Stations

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.

Table 2: Column Headings and Definitions for the Hourly Files
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


 

Table 3: Column Headings and Definitions for the Daily Files
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
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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
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

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Volume

The total data set volume is 656 KB.

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Spatial Coverage

Southernmost Latitude: 34.95º N
Northernmost Latitude: 35.55º N
Westernmost Longitude: 98.02º W
Easternmost Longitude: 97.98º 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 files.

Table 5: Parameters in 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.

Table 6: Parameters in 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

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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 each SCAN station and the parameters they measure.

Table 7: SCAN Station Sensors and Measured Parameters

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
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.

Silicon capacitive pressure sensor

Barometric pressure

Hourly barometric pressure is recorded.
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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

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

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

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Questions? Please contact:
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Email: nsidc@nsidc.org