PDF문서4차_18.11.09_독일의 초분광 지구관측 센서_김윤수 책임.pdf

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                                                                  e-정책정보센터                                                     

http://www.kari.re.kr 

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독일의  초분광  지구관측  센서 

한국항공우주연구원

  위성정보센터  위성활용실

  김윤수  (책임연구원)

초분광(Hyperspectral)센서는  인접한  스펙트럼  범위를  100개  이상의  밴드로  나누어서 

지표면의  매우  상세한  분광정보를  얻을  수  있는  센서이다.  최근  독일  우주청과  헌츠빌 

소재의  미국  기업인  TBE(Teledyne  Brown  Engineering)는  2018년  8월  27일 

ISS(International  Space  Station)외부에  장착된  초분광  지구관측  센서  DESIS(DLR 

Earth  Sensing  Imaging  Spectrometer)의  영상을  2018년  10월  독일  브레멘에서  개최된 

IAC(International  Astronautical  Congress)에서  공개하였다.  DESIS는  독일우주청의 

광학센서시스템연구소(Institute  of  Optical  Sensor  System)가  개발한  센서로  어떠한 

우주기반  초분광  지구관측  센서보다  우수한  성능을  지니고  있으며,  ISS의  400km 

궤도에서  235개의  채널을  통해  30m  지상해상도의  영상을  취득할  수  있는  현존하는 

유일한  우주기반  고해상도  초분광  센서이다.  본격적인  DESIS의  운영까지는  아직  많은 

단계를  거쳐야  하지만  독일  우주청의  과학자들은  Falkland  섬  주변  바다에서  클로로필 

a  농도를  측정하고,  알라바마  테네시  강의  유기물을  분석하는  등  DESIS  영상을  분석

하여  지표면의  새로운  정보를  추출하는  많은  가능성을  보이고  있다.  초분광  센서는  호

수와  바다의  수질  측정에  이상적인  정보를  제공할  수  있으며,  그  밖에도  농업,  식생, 

지질,  사막화  등  전반적인  환경  관련  변화  탐지에  매우  유용한  정보를  제공한다.  독일 

우주청은  DESIS  자료의  연구  과학적  목적을  위해  활용하며,  TBE는  상업적  목적으로 

배포할  예정이다.  이와  더불어  독일  우주청은  지구  환경을  모니터링하고  분석하는  것을 

목적으로  하는  초분광  위성  EnMAP(Environmental  Mapping  and  Analysis  Program)

을  개발하고  있다.  EnMAP은  244개의  분광밴드로  공간해상도  30m의  영상을  획득할 

수  있으며  전세계를  대상으로  다양한  육지  및  수생태계의  상태와  진화  등에  대한  지구

화학,  생화학,  물리적  변수들을  추출하여  지구  생태계의  역동적  과정을  측정하고  모델

링할  수  있는  지구과학  정보를  제공할  예정이다.  현재는  위성  발사  전  마지막  준비 

단계인  Phase  D로,  위성의  모든  구성품의  성능을  확인  및  인증하고  지상국도  완전한 

준비  태세를  갖춘  단계로  당초  위성의  발사는  2018년을  목표로  하고  있었으나  발사 

일정이  계속  미뤄지고  있다.


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                                                                  e-정책정보센터                                                     

http://www.kari.re.kr 

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[그림 1] DESIS 첫 영상

<ht ps://www.dlr.de/dlr/en/desktopdefault.aspx/tabid-10261/371_read-30091//usetemplate-print/>

[그림 2] DESIS 영상을 활용한 수질분석

<ht ps://www.dlr.de/dlr/en/desktopdefault.aspx/tabid-10261/371_read-30091//usetemplate-print/>


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                                                                  e-정책정보센터                                                     

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[그림 3] DESIS가 촬영한 두바이 영상

<ht ps://www.dlr.de/dlr/en/desktopdefault.aspx/tabid-10261/371_read-30091//usetemplate-print/>

<표 1> 1.1. EnMAP Hyperspectral Imager 제원

Spectral  range

VNIR:  420  –  1,000  nm  (up  to  99  bands)

SWIR:  900  –  2,450  nm  (up  to  163  bands)

Spectral  sampling  distance

VNIR:  6.5  nm

SWIR:  10  nm

Spectral  accuracy

VNIR:  0.5  nm

SWIR:  1.0  nm

SNR  (Signal-to-Noise  ratio)

VNIR:  500  (at  495  nm)

SWIR:  150  (at  2,200  nm)

Smile  and  keystone

0.2  pixel

Polarization  sensitivity

5%

Radiometric  resolution

14  bits

Radiometric  accuracy

5%

Geometric  resolution

30  X  30  m

Swath  width

30  km

MTF  (Modular  Transfer  Fuction)

>  0.25  @  60m  across  track

>  0.16  @  60m  along  track

>  0.64  @  240m  across  track

>  0.62  @  240m  along  track

Geometric  co-registration

0.2  pixel

Pointing

Accuracy:  500  m

Knowledge:  100  m

Stability:  1.5  m  in  4  ms

Agility:  30°  in  5  min.  with  pointing  stabilization

<ht p:/ www.enmap.org/sites/default/files/pdf/Table_EnMAP_Specs.pdf>

※  이  글은  아래  링크의  기사를  참조하여  작성하였습니다. 

https://www.dlr.de/dlr/en/desktopdefault.aspx/tabid-10261/371_read-30091//usetemplate-print/

https://directory.eoportal.org/web/eoportal/satellite-missions/e/enmap