Campaign information
Located approximately 10 km west of Albacete, near Barrax, Castilla-La-Mancha, Spain, Las Tiesas – Barrax (39.0549°N, 2.1010°W) is an experimental farm. The site is managed by the Instituto TĂ©cnico AgronĂłmico Provincial (ITAP), and is comprised of irrigated crops including alfalfa, garlic, rapeseed, spring onion, sunflower, poppy and wheat), in addition to a number of bare soil areas.
For the biophysical variables, the Las Tiesas – Barrax campaign took place between 19th and 22nd July 2021. 52 elementary sampling units (ESUs) were characterised (79 with digital hemispherical photography, 50 with LI-COR LAI-2200 and Meter AccuPAR LP-80 measurements, and 52 with Konica Minolta SPAD-502 chlorophyll meter measurements). These data were upscaled to produce high spatial resolution reference maps using Sentinel-2 data. All datasets were collected and processed according to the FRM Protocols and Procedures and Validation Methodology. The FRM datasets produced from the campaign are available to download below.
Datasets
| Dataset | Description |
|---|---|
| Biophysical variables | |
| In situ reference measurements | In situ reference measurements (and uncertainties) at the elementary sampling unit (ESU) level |
| High spatial resolution reference maps | 20 m spatial resolution reference maps (with per-pixel uncertainties) derived by upscaling the in situ measurements using Sentinel-2 data |
Attribution
If using the FRM4VEG data in publications or reports, a link to the FRM4VEG website should be provided along with the following citations:
Surface reflectance
Origo, N., Gorroño, J., Ryder, J., Nightingale, J. and Bialek, A. 2020, Fiducial Reference Measurements for Validation of Sentinel-2 and PROBA-V surface reflectance products, Remote Sensing of Environment, 242, 111690, 10.1016/j.rse.2020.111690.
Biophysical variables
Brown, L.A., Camacho, F., GarcĂa-Santos, V., Origo, N., Fuster, B., Morris, H., Pastor-Guzman, J., Sánchez-Zapero, J., Morrone, R., Ryder, J., Nightingale, J., Boccia, V. and Dash, J. 2021, Fiducial Reference Measurements for Vegetation Bio-Geophysical Variables: An End-to-End Uncertainty Evaluation Framework, Remote Sensing, 13 (16), 3194, 10.3390/rs13163194.
The following text should also be incorporated in the acknowledgements:
This study has been undertaken using data from the “Fiducial Reference Measurements for Vegetation – Phase 2” (FRM4VEG – Phase 2) project, which was funded by the European Space Agency.