This data set includes hourly precipitation data taken at 20 rain gauge locations as part of the Soil Moisture Experiment 2002 (SMEX02).
SMEX02 Rain Gauge Network, Walnut Creek, Iowa, 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.
Prueger, J. 2004. SMEX02 Rain Gauge Network, Walnut Creek, 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/CL64ZTG0S892. [Date Accessed].Detailed Data Description
Data are ASCII tab-delimited text files.
File size is 1.7 MB.
Total volume of combined files is 1.7 MB
Southernmost Latitude: 41.94°N
Northernmost Latitude: 41.99°N
Westernmost Longitude: 93.8°W
Easternmost Longitude: 93.4°W
Data were collected from 1 June 2002 to 19 August 2002.
Temporal Resolution
Data were gathered every hour.
The following table describes the columns in the data file.
Column/Parameter | Unit | Description |
---|---|---|
Site_ID | Rain gauge identifier | |
Latitude | degrees | WGS84 |
Longitude | degrees | WGS84 |
UTM_Easting | meters (m) | WGS84, Zone 15 |
UTM_Northing | meters (m) | WGS84, Zone 15 |
Date | mm/dd/yyyy | Date measurement was taken |
Hour | 0 to 23 | Hour measurement was taken (0 is midnight Central Standard Time) |
Precip | millimeters (mm) | Amount of precipitation measured (missing data are represented by -99) |
Sample Data Record
The following table shows a small sample of the data file.
SITE_ID | lat | lon | Easting | Northing | DATE | hour | precip |
---|---|---|---|---|---|---|---|
703 | 41.9792 | -93.6582 | 445452 | 4647680 | 6/1/2002 | 0 | 0 |
703 | 41.9792 | -93.6582 | 445452 | 4647680 | 6/1/2002 | 1 | 0 |
... | |||||||
703 | 41.9792 | -93.6582 | 445452 | 4647680 | 6/2/2002 | 5 | 3.6 |
703 | 41.9792 | -93.6582 | 445452 | 4647680 | 6/2/2002 | 6 | 0.8 |
703 | 41.9792 | -93.6582 | 445452 | 4647680 | 6/2/2002 | 7 | 0 |
703 | 41.9792 | -93.6582 | 445452 | 4647680 | 6/2/2002 | 8 | 1.3 |
Software and Tools
Data Acquisition and Processing
Rain gauges are intended to provide continuous measurements of the precipitation at a single point, with many gauges distributed throughout the watershed.
The sources are twenty rain gauges placed in crop fields in the study area. A Texas Electronics model TE525 tipping bucket rain gauge measured precipitation. The device consists of small cones that fill up and tip when a specific amount of rain falls into the cone. The number of tips is converted to a calculated rainfall amount. These data are logged to a Campbell Scientific CR10 datalogger.
References and Related Publications
Contacts and Acknowledgments
John Prueger, Hydrologist
U.S. Department of Agriculture (USDA) Agriculture Research Service (ARS) National Soil Tilth Laboratory.
Dr. Prueger would like to acknowledge the National Soil Tilth Laboratory in Ames, Iowa for support in maintaining this rain gauge network.
Document Information
DOCUMENT CREATION DATE
May 2004