TY - GEN
T1 - Effects of land-use types and spatial scales on evapotranspiration using remote sensing techniques
AU - Cheng, Chi Chuan
AU - Lo, Hann Chung
AU - Wu, Chih-Da
PY - 2007/12/1
Y1 - 2007/12/1
N2 - This study focused on the effect of land-use types and spatial scales on the evapotranspiration (ET) using remote sensing techniques. The processes included applying hybrid classification to generate a land-use map of northern Taiwan using Landsat-5 image in 1995; using DTM and the SEBAL model to calculate the parameters referred to ET and to compare the differences among different land-use types; and assessing the effects of 2 spatial scales (i.e., northern Taiwan and 7 watersheds within northern Taiwan) on ET using stepwise discriminated analysis. The result indicated that the area of northern Taiwan was classified into 7 land-use types (i.e., forest-land, building, farm-land, baring farm-land, water body, cloud, and shadow). The comparison of ET among different types showed that forest area had the highest value and then farm-land, water body, baring farm land, and building sequentially. As for the assessment of spatial scales on ET, the result pointed out that no matter which kind of spatial scales, the required parameters and the number of parameters for discriminating 5 land-use types (excluding cloud and shadow) were not the same, but NDVI and surface temperature were the most effective parameters. From above results, obviously ET varied with land-use types and spatial scales. Therefore, their effects on ET had to be considered in natural resource or water resource management.
AB - This study focused on the effect of land-use types and spatial scales on the evapotranspiration (ET) using remote sensing techniques. The processes included applying hybrid classification to generate a land-use map of northern Taiwan using Landsat-5 image in 1995; using DTM and the SEBAL model to calculate the parameters referred to ET and to compare the differences among different land-use types; and assessing the effects of 2 spatial scales (i.e., northern Taiwan and 7 watersheds within northern Taiwan) on ET using stepwise discriminated analysis. The result indicated that the area of northern Taiwan was classified into 7 land-use types (i.e., forest-land, building, farm-land, baring farm-land, water body, cloud, and shadow). The comparison of ET among different types showed that forest area had the highest value and then farm-land, water body, baring farm land, and building sequentially. As for the assessment of spatial scales on ET, the result pointed out that no matter which kind of spatial scales, the required parameters and the number of parameters for discriminating 5 land-use types (excluding cloud and shadow) were not the same, but NDVI and surface temperature were the most effective parameters. From above results, obviously ET varied with land-use types and spatial scales. Therefore, their effects on ET had to be considered in natural resource or water resource management.
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M3 - Conference contribution
AN - SCOPUS:84865648299
SN - 9781615673650
T3 - 28th Asian Conference on Remote Sensing 2007, ACRS 2007
SP - 1597
EP - 1602
BT - 28th Asian Conference on Remote Sensing 2007, ACRS 2007
T2 - 28th Asian Conference on Remote Sensing 2007, ACRS 2007
Y2 - 12 November 2007 through 16 November 2007
ER -