On Friday, 07 April 2017 from 1:00 p.m. to 2:00 p.m. (USA Mountain Time), we will be performing scheduled maintenance, which may cause temporary disruptions to our Web site, applications, HTTPS, and FTP. We apologize for any inconvenience this may cause you. Need to talk to us? You can always contact our friendly User Services Office at email@example.com or + 1 303.492.6199.
This data set includes hourly precipitation data taken at 20 rain gauge locations as part of the Soil Moisture Experiment 2002 (SMEX02).
Prueger, J. 2004. SMEX02 Rain Gauge Network, Walnut Creek, Iowa. [indicate subset used]. Boulder, Colorado USA: NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: 10.5067/CL64ZTG0S892.
|Data format||ASCII tab-delimited text files|
|Spatial coverage and resolution||42°N, 93°W|
|Temporal coverage and resolution||1 June 2002 to 19 August 2002
Data were gathered every hour
|File size||1.7 MB|
|Parameter(s)||Precipitation intensity in mm|
|Procedures for obtaining data||FTP
John Prueger, Hydrologist
U.S. Department of Agriculture (USDA) Agriculture Research Service (ARS) National Soil Tilth Laboratory.
NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449 USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
Dr. Prueger would like to acknowledge the National Soil Tilth Laboratory in Ames, Iowa for support in maintaining this rain gauge network.
Data are ASCII tab-delimited text files.
File size 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.
Data were gathered every hour.
The following table describes the columns in the data file.
|Site_ID||Rain gauge identifier|
|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)|
The following table shows a small sample of the data file.
Total volume of combined files is 1.7 MB
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.
The following acronyms and abbreviations are used in this document.
|AMSR-E||Advanced Microwave Scanning Radiometer - Earth Observing System|
|FTP||File Transfer Protocol|
|SMEX||Soil Moisture Experiment|