Table 1.

Correlation coefficients between evapotranspiration measured at moisture flux towers and MODIS vegetation indices and relevant meteorological data in the southwestern U.S. T_a is maximum daily temperature and P is precipitation. Correlation coefficients for combined variables are for the multiple linear regression equation of best fit for combined riparian (EVI + T_a) or upland (EVI + P) sites. From data in [31,34,76].

Tower Site	Vegetation	EVI	NDVI	Ta	P	EVI + Ta	EVI + P
Riparian
San Pedro 1	Mesquite	0.87	0.83	0.77	-	0.88	-
San Pedro 2	Mesquite	0.86	0.82	0.77	-	0.90	-
San Pedro 3	Sacaton	0.94	0.82	0.77	-	0.97	-
Rio Grande 1	Saltcedar	0.83	0.68	0.84	-	0.88	-
Rio Grande 2	Saltcedar	0.84	0.52	0.82	-	0.89	-
Rio Grande 3	Cottonwood	0.84	0.74	0.86	-	0.90	-
Rio Grande 4	Cottonwood	0.82	0.77	0.89	-	0.89	-
Colorado 1	Saltcedar	0.83	0.64	0.92	-	0.92	-
Colorado 2	Arrowweed	0.64	0.50	0.76	-	0.79	-
Upland
Grassland	Grama	0.82	0.80	-	0.66	-	0.84
Shrubland	Mixed	0.87	0.78	-	0.72	-	0.90
Mean		0.83	0.72	0.82	0.69	0.89	0.87