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Description

As part of the SMAPVEX19-22 campaign, an L-band radiometer was deployed on top of a tower at Harvard Forest,Massachusetts, looking down at a stand of red oak forest. The radiometer collected data in V-polarization from late April to mid October 2019. Over 4 days in early July 2019, the water potential and L-band complex dielectric constant of canopy leaves were measured at various times of day. Other instruments were installed within the radiometer's field of view to measure soil moisture and temperature, air temperature, tree xylem apparent dielectric permittivity at 70 MHz, tree xylem water potential, and canopy wetness. The goal of this experiment was to study the sensitivity of L-band vegetation optical depth (VOD) to changing vegetation water potential over a growing season.

Version Description

Initial release.

Product Summary

Platforms
GROUND-BASED OBSERVATIONS
Instruments
DIELECTRIC PROBE ,
HUMIDITY SENSORS ,
PRESSURE SENSORS ,
RADIOMETERS ,
SOIL MOISTURE PROBE ,
SOIL TEMPERATURE PROBE ,
THERMOMETERS
Spatial Extent

N: 42.54 S: 42.54 E: -72.17 W: -72.17

Spatial Reference System(s)
WGS 84 (EPSG:4326)
Location
MASSACHUSETTS
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2019-04-28 to 2019-10-17
Temporal Resolution
1 Hour
Concept ID
C3286117088-NSIDC_CPRD
Data State
COMPLETE
Number of Files/Granules
4
Processing Level
NA
Published
Science Keywords
Air Temperature ,
Brightness Temperature ,
Soil Temperature ,
Surface Soil Moisture ,
Vegetation Optical Depth ,
Vegetation Water Potential ,
Xylem Dielectric Permittivity

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Holtzman, N., Konings, A., Roy, A., Cosh, M., Kraatz, S., Siqueira, P., & Colliander, A. (2020). SMAPVEX19-22 Massachusetts Vegetation Optical Depth, Version 1 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/2PZJDURUJLWF Date Accessed: 2026-05-04

Documents

Publications Citing This Dataset

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Title Year Author Topic
Estimation of Forest Water Potential from Ground-Based L-band Radiometry Jagdhuber, Thomas, Schmidt, Anne-Sophie, Fluhrer, Anke, Chaparro, David, Jonard, Francois, Piles, Maria, Holtzman, Natan, Konings, Alexandra G., Feldman, Andrew F., Baur, Martin J., Steele-Dunne, Susan, Schellenberg, Konstantin, Kunstmann, Harald Air Temperature, Brightness Temperature, Soil Temperature, Surface Soil Moisture, Vegetation Optical Depth, Vegetation Water Potential, Xylem Dielectric Permittivity
SMAP Validation Experiment 2019-2022 (SMAPVEX19-22): Field Campaign to Improve Soil Moisture and Vegetation Optical Depth Retrievals in Temperate Forests Colliander, Andreas, Cosh, Michael H., Bourgeau-Chavez, Laura, Kelly, Victoria R., Kraatz, Simon, Siqueira, Paul, Walker, Victoria A., Chen, Xingjian, Roy, Alexandre, Lakhankar, Tarendra, McDonald, Kyle C., Steiner, Nicholas, Kurum, Mehmet, Kim, Seung-bum, Berg, Aaron, Xu, Xiaolan, Misra, Sidharth, Ogut, Mehmet, Vittucci, Cristina, Kimball, John S., Entekhabi, Dara, Yueh, Simon H. Air Temperature, Brightness Temperature, Soil Temperature, Surface Soil Moisture, Vegetation Optical Depth, Vegetation Water Potential, Xylem Dielectric Permittivity, Lidar
Measuring Changes in Vegetation Moisture from Insar Closure Phase Time Series Wig, Elizabeth, Michaelides, Roger, Zebker, Howard Air Temperature, Brightness Temperature, Soil Temperature, Surface Soil Moisture, Vegetation Optical Depth, Vegetation Water Potential, Xylem Dielectric Permittivity
L-band vegetation optical depth as an indicator of plant water potential in a temperate deciduous forest stand Holtzman, Nataniel M., Anderegg, Leander D. L., Kraatz, Simon, Mavrovic, Alex, Sonnentag, Oliver, Pappas, Christoforos, Cosh, Michael H., Langlois, Alexandre, Lakhankar, Tarendra, Tesser, Derek, Steiner, Nicholas, Colliander, Andreas, Roy, Alexandre, Konings, Alexandra G. Air Temperature, Brightness Temperature, Soil Temperature, Surface Soil Moisture, Vegetation Optical Depth, Vegetation Water Potential, Xylem Dielectric Permittivity
Retrieval of Forest Water Potential from L-Band Vegetation Optical Depth Jagdhuber, T., Fluhrer, A., Schmidt, A.-S., Jonard, F., Chaparro, D., Meyer, T., Holtzman, N., Konings, A. G., Feldman, A., Baur, M., Piles, M., Entekhabi, D. Air Temperature, Brightness Temperature, Soil Temperature, Surface Soil Moisture, Vegetation Optical Depth, Vegetation Water Potential, Xylem Dielectric Permittivity
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