Related Experiment Video
Updated: Jan 8, 2026

In Situ Soil Moisture Sensors in Undisturbed Soils
Published on: November 18, 2022
SMCR: A first satellite-derived all-weather daily/1-km Soil Moisture Climatological Record (1980-2023)
Shuangxue Zhai1, Pei Leng2, Chunfeng Ma3
1State Key Laboratory of Efficient Utilization of Arable Land in China/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
Abstract:
Soil moisture (SM) has long been recognized as one of the essential climate variables. However, there are no satellite-derived global SM climatological records spanning over 30 years at fine spatiotemporal resolution. Based on the latest version of the 25 km CCI SM data and 1 km soil data derived from the SoilGrids, a spatially continuous CCI dataset was first obtained using the triple collocation analysis algorithm with the assistance of SM derived from the ERA5, GLEAM, and GLDAS. Subsequently, SM was derived at a fine resolution of 1 km using a downscaling approach considering the sub-grid variability of hydraulic parameters. Finally, the first satellite-derived SM climatological record (1980-2023) at fine spatiotemporal resolution with global seamless coverage was developed. A comprehensive validation against 372 global in-situ observations yielded an averaged unbiased root mean square error of 0.051 m3/m3. Specifically, a Bayesian statics-based credibility analysis of the validated accuracy was first conducted at four networks with dense observation stations. Results indicated an averaged credibility of 83.5% of the accuracy assessment at these networks.
More Related Videos
08:49Manufacturing Simple and Inexpensive Soil Surface Temperature and Gravimetric Water Content Sensors
Published on: December 21, 2019
09:55Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data
Published on: December 12, 2013
Related Concept Videos
Precipitation and Co-precipitation
Precipitation Gravimetry
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Global Climate Change
Precipitation Processes
What is Climate?
Temperature Measurement Sites
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...