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Browsing by Author Caldwell, T.G.

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  • Field and Laboratory Evaluation of the CS655 Soil Water Content Sensor

    • Authors: Caldwell, T.G.;  Advisor: -;  Participants: Bongiovanni, T.; Cosh, M.H.; Halley, C.; Young, M.H. (2018)

  • This measured attenuation is quadratically related to bulk electrical conductivity (EC). Along with an onboard thermistor, the CS655 allows a more robust correction of propagation time and Ka, which its predecessors, the CS615 and CS616, lacked. However, with new sensors it is necessary to quantify their practical accuracy in the field. Here, we present an overview of the CS655 sensor and an evaluation under both laboratory and field conditions, using five surface soils (0–10‐cm depth) in the laboratory and gravimetric samples collected in the field. Overall, a site‐specific calibration using a two‐term linearization of the SWC–Ka function reduced the root mean square error (RMSE) of ...
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  • The Texas Soil Observation Network:A Comprehensive Soil Moisture Dataset for Remote Sensing and Land Surface Model Validation

    • Authors: Caldwell, T.G.;  Advisor: -;  Participants: Bongiovanni, T.; Cosh, M.H.; Jackson, T.J.; Colliander, A.; Abolt, C.J.; Casteel, R.; Larson, T.; Scanlon, B.R.; Young, M.H. (2019)

  • The spatiotemporal variability of soil water content (SWC) at the remote sensing scale requires dense monitoring for calibration and validation. Here, we present an overview of the Texas Soil Observation Network (TxSON), an intensively monitored area in the semiarid rangelands of the central Texas Hill Country. TxSON is a dense network consisting of 40 in situ locations nested at 36, 9, and 3 km within the Equal‐Area Scalable Earth Grid and serves as a Core Calibration and Validation Site for NASA's Soil Moisture Active Passive mission. The 4‐yr dataset consists of hourly SWC measured at 5, 10, 20, and 50 cm. The SWC data are upscaled using arithmetic, Voronoi, and inverse distance we...