Application of Remote Sensing Techniques to Environmental Assessment

• Main Authors: Yuan-Fong Su, 蘇元風
• Other Authors: Ke-Sheng Cheng
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/50485045153288060293

博士 === 國立臺灣大學 === 生物環境系統工程學研究所 === 97 === With the fast advancement of remote sensing technology, efficient and timely monitoring of environmental changes has become a reality. Among all kinds of environmental monitoring, climate changes and water resources are of most concern due to their extensive and potentially devastating impact. In this dissertation, feasibilities of three types of environmental monitoring – coastal water quality monitoring, effect of landcover changes on ambient air temperature, and forest drought monitoring using remote sensing techniques are investigated. A multivariate water quality estimation model which can take into consideration the combined effect of various seawater constituents on water surface reflectance was proposed. The multivariate model was found to be superior to traditional univariate models. Changes in coverage ratio of individual landcover types within a NOAA pixel affect the NOAA-pixel average air temperature. Forest drought monitoring involves drought classification using NDVI derived from SPOT images. Seasonal variations of NDVI and ambient air temperature were assessed using multispectral SPOT images and NOAA thermal images.