Ray tracing based simulation of stray light effect for geostationary ocean color imager

Eunsong Oh, Jinsuk Hong, Sug Whan Kim, Seongick Cho, Joo Hyung Ryu

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

2 Citations (Scopus)

Abstract

Image mosaic technique is widely used in a field of remote sensing research. However, in case of Geostationary Ocean Color Imager's (GOCI's) mosaic image which is consist of 16 slot images, the radiance level discrepancy was noticed in the cloudy circumstance next to each other slot when acquiring the imagery data in the low Sun elevation angle. We provided, in this study, the in-depth stray light analysis results in order to find out this discrepancy phenomenon, and performed to compare the stray light pattern via a bright target movement. Stray light analysis as the first step was completed with ray tracing technique based on ASAP program, and we suggested that unwanted radiations from the Earth bright target or the atmosphere such as cloud are major candidates of stray light in the problematic images. For embodying GOCI operational concept, we constructed the Integrated Ray Tracing model consisting of the Sun model as a light source, a target Earth model, and the GOCI optical system model. In the second step, we investigated the stray light pattern at each slot image including unwanted random source from out of field, and then constructed the simulated mosaic bias image reached at the detector plane. In the simulated bias, the ray path followed the procedures that light travels from the Sun and it is then reflected from the Earth section of roughly 2500km* 2500km in size around the Korea peninsula with 16 slots. Lastly, we analyzed stray light pattern in the third step for the real image environment acquired at UTC-03 16th, October, 2011. In addition, verification was performed to compare the difference among slot boundaries for moving bright target.

Original languageEnglish
Title of host publicationOptical Modeling and Performance Predictions VI
Volume8840
DOIs
Publication statusPublished - 2013 Nov 28
EventOptical Modeling and Performance Predictions VI - San Diego, CA, United States
Duration: 2013 Aug 262013 Aug 29

Other

OtherOptical Modeling and Performance Predictions VI
CountryUnited States
CitySan Diego, CA
Period13/8/2613/8/29

Fingerprint

Stray light
Ocean Color
Stray Light
Ray Tracing
Ray tracing
Imager
ray tracing
Image sensors
oceans
slots
Color
color
Sun
Image Mosaic
Simulation
simulation
Earth (planet)
sun
Target
Discrepancy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Oh, E., Hong, J., Kim, S. W., Cho, S., & Ryu, J. H. (2013). Ray tracing based simulation of stray light effect for geostationary ocean color imager. In Optical Modeling and Performance Predictions VI (Vol. 8840). [884006] https://doi.org/10.1117/12.2023754
Oh, Eunsong ; Hong, Jinsuk ; Kim, Sug Whan ; Cho, Seongick ; Ryu, Joo Hyung. / Ray tracing based simulation of stray light effect for geostationary ocean color imager. Optical Modeling and Performance Predictions VI. Vol. 8840 2013.
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abstract = "Image mosaic technique is widely used in a field of remote sensing research. However, in case of Geostationary Ocean Color Imager's (GOCI's) mosaic image which is consist of 16 slot images, the radiance level discrepancy was noticed in the cloudy circumstance next to each other slot when acquiring the imagery data in the low Sun elevation angle. We provided, in this study, the in-depth stray light analysis results in order to find out this discrepancy phenomenon, and performed to compare the stray light pattern via a bright target movement. Stray light analysis as the first step was completed with ray tracing technique based on ASAP program, and we suggested that unwanted radiations from the Earth bright target or the atmosphere such as cloud are major candidates of stray light in the problematic images. For embodying GOCI operational concept, we constructed the Integrated Ray Tracing model consisting of the Sun model as a light source, a target Earth model, and the GOCI optical system model. In the second step, we investigated the stray light pattern at each slot image including unwanted random source from out of field, and then constructed the simulated mosaic bias image reached at the detector plane. In the simulated bias, the ray path followed the procedures that light travels from the Sun and it is then reflected from the Earth section of roughly 2500km* 2500km in size around the Korea peninsula with 16 slots. Lastly, we analyzed stray light pattern in the third step for the real image environment acquired at UTC-03 16th, October, 2011. In addition, verification was performed to compare the difference among slot boundaries for moving bright target.",
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Oh, E, Hong, J, Kim, SW, Cho, S & Ryu, JH 2013, Ray tracing based simulation of stray light effect for geostationary ocean color imager. in Optical Modeling and Performance Predictions VI. vol. 8840, 884006, Optical Modeling and Performance Predictions VI, San Diego, CA, United States, 13/8/26. https://doi.org/10.1117/12.2023754

Ray tracing based simulation of stray light effect for geostationary ocean color imager. / Oh, Eunsong; Hong, Jinsuk; Kim, Sug Whan; Cho, Seongick; Ryu, Joo Hyung.

Optical Modeling and Performance Predictions VI. Vol. 8840 2013. 884006.

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

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Oh E, Hong J, Kim SW, Cho S, Ryu JH. Ray tracing based simulation of stray light effect for geostationary ocean color imager. In Optical Modeling and Performance Predictions VI. Vol. 8840. 2013. 884006 https://doi.org/10.1117/12.2023754