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United States Climate Reference Network (USCRN) Standardized Soil Moisture and Soil Moisture Climatology

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: January 27, 2026 | Last Modified: 2021-12-10T00:00:00.000+00:00
The U.S. Climate Reference Network (USCRN) was designed to monitor the climate of the United States using research quality instrumentation located within representative pristine environments. This Standardized Soil Moisture (SSM) and Soil Moisture Climatology (SMC) product set is derived using the soil moisture observations from the USCRN. The hourly soil moisture anomaly (SMANOM) is derived by subtracting the MEDIAN from the soil moisture volumetric water content (SMVWC) and dividing the difference by the interquartile range (IQR = 75th percentile - 25th percentile) for that hour: SMANOM = (SMVWC - MEDIAN) / (IQR). The soil moisture percentile (SMPERC) is derived by taking all the values that were used to create the empirical cumulative distribution function (ECDF) that yielded the hourly MEDIAN and adding the current observation to the set, recalculating the ECDF, and determining the percentile value of the current observation. Finally, the soil temperature for the individual layers is provided for the dataset user convenience. The SMC files contain the MEAN, MEDIAN, IQR, and decimal fraction of available data that are valid for each hour of the year at 5, 10, 20, 50, and 100 cm depth soil layers as well as for a top soil layer (TOP) and column soil layer (COLUMN). The TOP layer consists of an average of the 5 and 10 cm depths, while the COLUMN layer includes all available depths at a location, either two layers or five layers depending on soil depth. The SSM files contain the mean VWC, SMANOM, SMPERC, and TEMPERATURE for each of the depth layers described above. File names are structured as CRNSSM0101-STATIONNAME.csv and CRNSMC0101-STATIONNAME.csv. SSM stands for Standardized Soil Moisture and SCM represent Soil Moisture Climatology. The first two digits of the trailing integer indicate major version and the second two digits minor version of the product.

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Complete Metadata
@type dcat:Dataset
accessLevel non-public
accrualPeriodicity R/P1M
contactPoint 
                                            {
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describedByType application/octet-steam
description The U.S. Climate Reference Network (USCRN) was designed to monitor the climate of the United States using research quality instrumentation located within representative pristine environments. This Standardized Soil Moisture (SSM) and Soil Moisture Climatology (SMC) product set is derived using the soil moisture observations from the USCRN. The hourly soil moisture anomaly (SMANOM) is derived by subtracting the MEDIAN from the soil moisture volumetric water content (SMVWC) and dividing the difference by the interquartile range (IQR = 75th percentile - 25th percentile) for that hour: SMANOM = (SMVWC - MEDIAN) / (IQR). The soil moisture percentile (SMPERC) is derived by taking all the values that were used to create the empirical cumulative distribution function (ECDF) that yielded the hourly MEDIAN and adding the current observation to the set, recalculating the ECDF, and determining the percentile value of the current observation. Finally, the soil temperature for the individual layers is provided for the dataset user convenience. The SMC files contain the MEAN, MEDIAN, IQR, and decimal fraction of available data that are valid for each hour of the year at 5, 10, 20, 50, and 100 cm depth soil layers as well as for a top soil layer (TOP) and column soil layer (COLUMN). The TOP layer consists of an average of the 5 and 10 cm depths, while the COLUMN layer includes all available depths at a location, either two layers or five layers depending on soil depth. The SSM files contain the mean VWC, SMANOM, SMPERC, and TEMPERATURE for each of the depth layers described above. File names are structured as CRNSSM0101-STATIONNAME.csv and CRNSMC0101-STATIONNAME.csv. SSM stands for Standardized Soil Moisture and SCM represent Soil Moisture Climatology. The first two digits of the trailing integer indicate major version and the second two digits minor version of the product.
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identifier gov.noaa.ncdc:C01654
isPartOf A Description and Evaluation of U.S. Climate Reference Network Standardized Soil Moisture Dataset
issued 2021-12-10T00:00:00.000+00:00
keyword 
                                            [
  "Earth Science > Land Surface > Soils > Soil Moisture/Water Content",
  "Earth Science > Land Surface > Soils > Soil Temperature",
  "Terrestrial - Soil Moisture",
  "Continent > North America > United States Of America",
  "Geographic Region > Mid-Latitude",
  "Continent > North America > United States Of America > Alaska",
  "Vertical Location > Land Surface",
  "U.S. Climate Reference Network > USCRN",
  "SOIL TEMPERATURE PROBE",
  "SOIL MOISTURE PROBE",
  "Meteorological Stations",
  "250 km - < 500 km or approximately 2.5 degrees - < 5.0 degrees",
  "1 meter - < 30 meters",
  "< 1 meter",
  "Hourly - < Daily",
  "DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce"
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language 
                                            []
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2021-12-10T00:00:00.000+00:00
publisher 
                                            {
  "name": "NOAA National Centers for Environmental Information",
  "@type": "org:Organization"
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references 
                                            [
  "https://doi.org/10.1175/JAMC-D-18-0269.1"
]
rights otherRestrictions
spatial -66.0,18.0,172.0,72.0
temporal 2009-01-01T00:00:00+00:00/2009-01-01T00:00:00+00:00
title United States Climate Reference Network (USCRN) Standardized Soil Moisture and Soil Moisture Climatology

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