SPOT衛星影像之大氣改正模式及水稻反射率反演精度之評估

劉建慧; 楊純明; 劉振榮; Chien-Hui Liu; Chwen-Ming Yang; Gin Rong Liu

SPOT衛星影像之大氣改正模式及水稻反射率反演精度之評估

Other Title

Accuracies Assessment of the Atmospheric Correction Model and Retrieved Rice Reflectance for Spot Satellite Images

Journal

應用於水稻精準農業體系之知識與技術

Part Of

農業試驗所特刊第101號

Pages

79-88

ISBN

957-01-1173-9

Date Issued

2002-06

Date

2002-06

Author(s)

劉建慧

楊純明

劉振榮

Chien-Hui Liu

Chwen-Ming Yang

Gin Rong Liu

URI

https://scholars.tari.gov.tw/handle/123456789/2776

Abstract

由於遙測衛星影像具備經濟、快速且大面積觀測之能力，其於精準農業扮演之角色是非常重要的。為了有效利用遙測影像精準管理農田，其大氣效應之改正是必須的。本文使用同時氣膠特性及地表反射率反演法則，反演氣膠光厚度（AOD）和水稻反射率。經由AERONET資料之輔助，得到綠光及紅光波段所反演AOD之RMSE分別為0.12、0.08，其精度令人滿意。再者也利用GER光譜輻射儀驗證SPOT衛星影像反演之水稻反射率，結果指出經大氣改正後水稻反射率之RMSE由改正前之0.089減少為0.04，此誤差可能來自於AOD之高估或地面空間變異。 Remote sensing satellite images play an important role for the precision agriculture, since they have economical, fast and wide viewing abilities. To better utilize the remotely sensed images for precision farming, it is necessary to correct their atmospheric effect. In this paper, the concurrent retrieval algorithm of aerosol characteristics and surface reflectances are utilized to estimate the aerosol optical depth (AOD) and the rice reflectance. With the help of AERONET sunphotometer measurements, the estimated AOD RIVISEs are 0.12 and 0.08 in XS1 and XS2 bands, respectively. The results are quite satisfactory. Furthermore, the accuracy of retrieved rice reflectance is also evaluated by GER spectroradiometet. Before atmospheric correction, the RIVISE of rice reflectance is 0.089, and it is reduced to 0.04 afier correction. The errors may be due to over-estimation of AOD or spatial variation of the rice field.

Event(s)

水稻精準農業體系之研究計畫階段性成果研討會

Subjects

氣膠光厚度

大氣改正

水稻反射率

Aerosol optical depth

Atmospheric correction

Rice reflectance

Publisher

農業試驗所

Type

conference paper

File(s)

Name

publication_no101_09.pdf

Size

657.13 KB

Format

Adobe PDF

Checksum

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