SOPT衛星影像反演與地面多角度量測水稻反射率初探
Other Title
A Preliminary Study on Rice Reflectance with Retrieval from SPOT Satellite Images and Surface Multi-angular Measurements
Journal
中華農業氣象
Journal Volume
9
Pages
13-20
Date Issued
2002
Date
2002
Author(s)
劉建慧
楊純明
Chien-Hui Liu
Chwen-Ming Yang
Abstract
本文研究旨在探討利用SPOT衛星影像反演不同生長期水稻植被反射率之正規化流程，首先爲了因應將來使用SPOT衛星影像反演水稻植被反射率作業化之需求，開發以視窗介而爲基礎之遙測影像大氣改正資訊系統。此一遙測影像大氣改正資訊系統不僅提昇大氣改正之速度，且兼具提升其精度之要求。爲了改正遙測所反演水稻植被雙向反射特性，本硏究亦結含地面觀测試驗，分析水稻植被在不同生長期之雙向反射特性。結果顯小，水稻在不同生長期之植被雙向反射率變異相當明顯，隨觀測角變化甚大，不容忽視。本文研究將可用以對正規化不同生長期SPOT衛星影像所反演之水稻植被反射中作他備。
This paper was a preliminary study on normalization of bidirectional reflectance for rice canopy in different growth stages retrieved from spot satellite images. To provide the demand of operational retrieval of rice canopy reflectance from SPOT satellite images, a window-based atmospheric correction information system was developed. The system not only speeds up but also meets the accuracy requirement of atmospheric correction procedure. Ground-based bi-directional reflectance of rice canopy was taken from rice plants grown in different growth stages by a spectroradiometer. Result indicated that rice canopy reflectance varied significantly with varying viewing angles of scanner. The phenomena should be taken into account in interpreting the reflectance data. The bi-directional measurements such as this study can be used to normalize bi-directional reflectance retrieved from SPOT images for rice plants grown in different growth stages.
Subjects
水稻
不同生長期
SPOT衛星影像
大氣改正
雙向反射率
Rice
Growth stage
SPOT satellite image
Atmospheric correction
Bi-directional reflectance
Publisher
中華農業氣象學會
Type
journal article
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