@article{fdi:010070291,
  title = {{A}n operational method for the disaggregation of land surface temperature to estimate actual evapotranspiration in the arid region of {C}hile},
  author = {{O}livera-{G}uerra, {L}. and {M}attar, {C}. and {M}erlin, {O}livier and {D}uran-{A}larcon, {C}. and {S}antamaria-{A}rtigas, {A}. and {F}uster, {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}onitoring evapotranspiration in arid and semi-arid environments plays a key role in water irrigation scheduling for water use efficiency. {T}his work presents an operational method for evapotranspiration retrievals based on disaggregated {L}and {S}urface {T}emperature ({LST}). {T}he retrieved {LST}s from {L}andsat-8 and {MODIS} data were merged in order to provide an 8-day composite {LST} product at 100 x 100 m resolution. {T}he method was tested in the arid region of {C}opiapo, {C}hile using data from years 2013-2014 and validated using data from years 2015-2016. {I}n-situ measurements from agrometeorological stations such as air temperature and potential evapotranspiration ({ETU}) estimated at the location were used in the {ET} estimation method. {T}he disaggregation method was developed by taking into account (1) the spatial relationship between {L}andsat-8 and {MODIS} {LST}, (2) the spatial relationship between {LST} and the {N}ormalized {D}ifference {V}egetation {I}ndex ({NDVI}) at high spatial resolution ({L}andsat-8), and (3) the temporal variations along the year of both relationships aforementioned. {T}he comparison between disaggregated {LST} at 100 m resolution and in situ {LST} measurements presents a coefficient of determination (r(2)), in average, equal to 0.70 and a {RMSE} equal to 3.6 {K}. {T}he disaggregated {LST} was used in an operational model to estimate the actual evapotranspiration ({ET}a). {T}he {ET}a shows good results in terms of seasonal variations and in comparison to the evapotranspiration estimated by using crop coefficients (kc). {T}he comparison between remotely sensed and in situ {ET}a presents an overall r(2) close to 0.67 and a {RMSE} equal to 0.6 mm day(-1) for both crops. {T}hese results are important for further improvements in water use sustain ability in the {C}opiapo valley, which is currently affected by high water demand.},
  keywords = {{LST} ; {D}isaggregation ; {E}vapotranspiration ; {A}rid region ; {L}andsat-8 ; {MODIS} ; {CHILI}},
  booktitle = {},
  journal = {{ISPRS} {J}ournal of {P}hotogrammetry and {R}emote {S}ensing},
  volume = {128},
  numero = {},
  pages = {170--181},
  ISSN = {0924-2716},
  year = {2017},
  DOI = {10.1016/j.isprsjprs.2017.03.014},
  URL = {https://www.documentation.ird.fr/hor/fdi:010070291},
}