English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Thermal and multispectral remote sensing data from low-altitudeaircraft can provide high spatial resolution necessary for sub-field (≤  10 m)and plant canopy (≤  1 m) scale evapotranspiration (ET)monitoring. In this study, high-resolution (sub-meter-scale) thermalinfrared and multispectral shortwave data from aircraft are used to map ETover vineyards in central California with the two-source energy balance (TSEB)model and with a simple model having operational immediatecapabilities called DATTUTDUT (Deriving Atmosphere Turbulent Transport Useful To Dummies Using Temperature). The latter uses contextual informationwithin the image to scale between radiometric land surface temperature (TR)values representing hydrologic limits of potential ET and anon-evaporative surface. Imagery from 5 days throughout the growingseason is used for mapping ET at the sub-field scale. The performance of thetwo models is evaluated using tower-based measurements of sensible (H) andlatent heat (LE) flux or ET. The comparison indicates that TSEB was able toderive reasonable ET estimates under varying conditions, likely due to thephysically based treatment of the energy and the surface temperaturepartitioning between the soil/cover crop inter-row and vine canopy elements.On the other hand, DATTUTDUT performance was somewhat degraded presumablybecause the simple scaling scheme does not consider differences in the twosources (vine and inter-row) of heat and temperature contributions or theeffect of surface roughness on the efficiency of heat exchange. Maps of theevaporative fraction (EF  =  LE/(H + LE)) from the two models had similarspatial patterns but different magnitudes in some areas within the fields oncertain days. Large EF discrepancies between the models were found on 2 ofthe 5 days (DOY 162 and 219) when there were significant differences withthe tower-based ET measurements, particularly using the DATTUTDUT model.These differences in EF between the models translate to significantvariations in daily water use estimates for these 2 days for thevineyards. Model sensitivity analysis demonstrated the high degree ofsensitivity of the TSEB model to the accuracy of the TR data, while theDATTUTDUT model was insensitive to systematic errors in TR as is thecase with contextual-based models. However, it is shown that the studydomain and spatial resolution will significantly influence the ET estimationfrom the DATTUTDUT model. Future work is planned for developing a hybridapproach that leverages the strengths of both modeling schemes and is simpleenough to be used operationally with high-resolution imagery

Mapping evapotranspiration with high-resolution aircraft imagery over vineyards using one- and two-source modeling schemes