Effects of land-use types and spatial scales on evapotranspiration using remote sensing techniques

Chi Chuan Cheng, Hann Chung Lo, Chih-Da Wu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publication28th Asian Conference on Remote Sensing 2007, ACRS 2007
Pages1597-1602
Number of pages6
Publication statusPublished - 2007 Dec 1
Event28th Asian Conference on Remote Sensing 2007, ACRS 2007 - Kuala Lumpur, Malaysia
Duration: 2007 Nov 122007 Nov 16

Publication series

Name28th Asian Conference on Remote Sensing 2007, ACRS 2007
Volume3

Other

Other28th Asian Conference on Remote Sensing 2007, ACRS 2007
CountryMalaysia
CityKuala Lumpur
Period07-11-1207-11-16

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications

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