TY - JOUR
T1 - Terrain correction for increasing the evapotranspiration estimation accuracy in a mountainous watershed
AU - Wang, Yi Chen
AU - Chang, Tzu Yin
AU - Liou, Yuei An
N1 - Funding Information:
Manuscript received May 29, 2009; revised July 31, 2009. Date of publication November 24, 2009; date of current version April 14, 2010. The works of Y.-C. Wang and T.-Y. Chang were supported by the National University of Singapore (NUS) under Grant R-109-000-070-101.
PY - 2010/4
Y1 - 2010/4
N2 - Evapotranspiration (ET) plays a major role in the energy and water balances of the hydrological cycle. Monitoring ET at a regional level has become feasible with the advance of remote-sensing technology. This letter presents a module that incorporates satellite images, surface meteorological data, and topographic information in estimating ET over a tropical montane watershed. The satellite images used include Thematic Mapper (TM), Landsat-7 Enhanced Thematic Mapper Plus, and Advanced Spaceborne Thermal Emission and Reflection Radiometer with visible, near infrared, shortwave infrared, and thermal infrared bands. The estimated surface energy fluxes are compared with the in situ measurements. The results demonstrate that, compared to other model estimations, the proposed module with terrain correction provides the highest correlation (r = 0.75) between the estimated latent heat flux associated with ET and its corresponding in situ measurement. The proposed module will be further refined and applied to monitor long-term ET over mountainous watersheds.
AB - Evapotranspiration (ET) plays a major role in the energy and water balances of the hydrological cycle. Monitoring ET at a regional level has become feasible with the advance of remote-sensing technology. This letter presents a module that incorporates satellite images, surface meteorological data, and topographic information in estimating ET over a tropical montane watershed. The satellite images used include Thematic Mapper (TM), Landsat-7 Enhanced Thematic Mapper Plus, and Advanced Spaceborne Thermal Emission and Reflection Radiometer with visible, near infrared, shortwave infrared, and thermal infrared bands. The estimated surface energy fluxes are compared with the in situ measurements. The results demonstrate that, compared to other model estimations, the proposed module with terrain correction provides the highest correlation (r = 0.75) between the estimated latent heat flux associated with ET and its corresponding in situ measurement. The proposed module will be further refined and applied to monitor long-term ET over mountainous watersheds.
KW - Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER)
KW - Digital elevation model (DEM)
KW - Evapotranspiration (ET)
KW - Landsat
KW - Surface heat flux
UR - http://www.scopus.com/inward/record.url?scp=77951208816&partnerID=8YFLogxK
U2 - 10.1109/LGRS.2009.2035138
DO - 10.1109/LGRS.2009.2035138
M3 - 期刊論文
AN - SCOPUS:77951208816
SN - 1545-598X
VL - 7
SP - 352
EP - 356
JO - IEEE Geoscience and Remote Sensing Letters
JF - IEEE Geoscience and Remote Sensing Letters
IS - 2
M1 - 5340572
ER -