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This data set provides data from various sensors on the Soil Climate Analysis Network (SCAN) station number 2031, located near Ames, Iowa, USA.
Data Set ID:
NSIDC-0142
SMEX02 Soil Climate Analysis Network (SCAN) Station 2031, Ames, Iowa, Version 1
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
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Geographic Coverage |
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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.
Jackson, T. 2003. SMEX02 Soil Climate Analysis Network (SCAN) Station 2031, Ames, Iowa, 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/Z0HKNKTVBXM0. [Date Accessed].Collapse All / Open All
Detailed Data Description
Format
Data are in ASCII text format. The hourly data contain 32 columns; the daily data contain 8 columns. The following table is a key to the column headings and units of measure for the hourly data. The daily measurements (shown in the Label column) are a small subset of the hourly columns.
| Label | Measurement Type | Description | Units |
|---|---|---|---|
| PCPIN | CURRENT | Global Precipitation Sensor | inches |
| ATHC6 | CURRENT | Air temperature | Celsius |
| ATHX6 (hourly) ATX6 (daily) |
MAXIMUM | Air temperature | Celsius |
| ATHN6 (hourly) ATN6 (daily) |
MINIMUM | Air temperature | Celsius |
| ATHA6 (hourly) ATA6 (daily) |
AVERAGE | Air temperature | Celsius |
| SRHA | AVERAGE | Solar radiation | W/m2 |
| WSPHA (hourly) WSPDA (daily) |
AVERAGE | Wind speed | m/h |
| WDHA (hourly) WDDA (daily) |
AVERAGE | Wind direction | degree |
| WSPHX | MAXIMUM | Wind speed | m/h |
| RH1C1 | CURRENT | Relative humidity | percentage |
| RH1N1 | MINIMUM | Relative humidity | percentage |
| RH1X1 | MAXIMUM | Relative humidity | percentage |
| BPHGC | CURRENT | Barometric Pressure | inch of Hg |
| c1rdc | CURRENT | Real dielectric constant 2" | unitless |
| c1smv | CURRENT | Percent water by volume-2" | percentage |
| c1tmp | CURRENT | Soil temperature at depth of 2" | Celsius |
| c2rdc | CURRENT | Real dielectric constant at depth of 4" | unitless |
| c2smv | CURRENT | Percent water by volume at depth of 4" | percentage |
| c2tmp | CURRENT | Soil temperature at depth of 4" | Celsius |
| c3rdc | CURRENT | Real dielectric constant at depth of 8" | unitless |
| c3smv | CURRENT | Percent water by volume at depth of 8" | percentage |
| c3tmp | CURRENT | Soil temperature at depth of 8" | Celsius |
| c4rdc | CURRENT | Real dielectric constant at depth of 20" | unitless |
| c4smv | CURRENT | Percent water by volume at depth of 20" | percentage |
| c4tmp | CURRENT | Soil temperature at depth of 20" | Celsius |
| c5rdc | CURRENT | Real dielectric constant at depth of 40" | unitless |
| c5smv | CURRENT | Percent water by volume at depth of 40" | percentage |
| c5tmp | CURRENT | Soil temperature at depth of 40" | Celsius |
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File Naming Convention
Files are named for the SCAN site and the frequency of data collection. The file names are "SCAN2031_daily.txt" and "SCAN2031_hourly.txt."
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File Size
The file "SCAN2031_daily.txt" is 4 KB, "SCAN2031_hourly.txt" is 380 KB.
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Volume
Combined file size is 385 KB.
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Spatial Coverage
Measurements were taken at the SCAN site number 2031 in Ames, Iowa, USA. Latitude: 42.01° N, Longitude: 93.73° W.
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Temporal Coverage
Measurements were taken between 1 June 2003 and 31 August 2003.
Temporal Resolution
Measurements are given daily and hourly
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Parameter or Variable
Unit of Measurement:
The units of measurement for each parameter are given in the Format section.
Parameter Source:
The following table describes the parameters measured by each sensor:
| Sensor | Parameter | Description |
|---|---|---|
| Global precipitation sensor | Precipitation | This instrument records daily cumulative inches of precipitation. |
| Shielded thermistor | Air temperature | Raised 6 feet off of the ground, this device reports the current temperature and the previous hourly maximum, hourly minimum, and hourly average. |
| Soil sensors | Soil moisture, soil temperature | The soil moisture and soil temperature data were recorded by sensors located at 5 depths, 2", 4", 8" , 20", and 40". |
| Thin film capacitance-type sensor | Relative humidity | This sensor is six feet above the surface. The value is a percentage, reported as current, previous hourly maximum, and previous hourly minimum. |
| Anemometer | Wind speed and direction | This sensor is 10 feet above the surface. It provides an hourly average from continuously sampled data. |
| Pyranometer | Solar radiation | This silicon cell sensor is 10 feet above the surface. It provides hourly average readings of total incoming solar energy in terms of Watts per square meter. |
| Silicon capacitive pressure sensor | Barometric pressure | This sensor measures hourly barometric pressure. |
Sample Data Record:
The following is a sample from the hourly data:
| Year | Month | Day | ATX6 | ATN6 | ATA6 | WSPDA | WDDA |
|---|---|---|---|---|---|---|---|
| 2002 | 6 | 1 | 32.43 | 17.07 | 25.32 | 5.16 | 280.26 |
| 2002 | 6 | 2 | 35.12 | 17.73 | 26.94 | 4.66 | 28.75 |
| 2002 | 6 | 3 | 26.18 | 15.68 | 20.34 | 9.99 | 108.66 |
| 2002 | 6 | 4 | 27.72 | 14.8 | 21.39 | 9.17 | 90.46 |
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Software and Tools
View the data in a Web browser or text editor.
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References and Related Publications
Contacts and Acknowledgments
Thomas J. Jackson, Hydrologist, and Mike Cosh, General Physical Scientist, USDA ARS Hydrology Lab.
Acknowledgments:
United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) http://www.nrcs.usda.gov/
Document Information
DOCUMENT CREATION DATE
9 June 2003
No technical references available for this data set.
How To
V0 Programmatic Data Access Guide
Data from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) can be accessed directly from our HTTPS file system. We provide basic command line Wget and curl instructions for HTTPS file system downloads below. For questions about programmatic access to NSIDC... read more
