Radiometric Calibration for AgCam
The student-built Agricultural Camera (AgCam) now onboard the International Space Station observes the Earth surface through two linescan cameras with Charge-Coupled Device (CCD) arrays sensitive to visible and near-infrared wavelengths, respectively. The electro-optical components of the AgCam were...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2010-02-01
|
| Series: | Remote Sensing |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2072-4292/2/2/464/ |
| _version_ | 1818487903170330624 |
|---|---|
| author | Edward Hildum Lianbo Hu Hojin Kim Xiaodong Zhang Changyong Dou Doug Olsen |
| author_facet | Edward Hildum Lianbo Hu Hojin Kim Xiaodong Zhang Changyong Dou Doug Olsen |
| author_sort | Edward Hildum |
| collection | DOAJ |
| description | The student-built Agricultural Camera (AgCam) now onboard the International Space Station observes the Earth surface through two linescan cameras with Charge-Coupled Device (CCD) arrays sensitive to visible and near-infrared wavelengths, respectively. The electro-optical components of the AgCam were characterized using precision calibration equipment; a method for modeling and applying these measurements was derived. Correction coefficients to minimize effects of optical vignetting, CCD non-uniform quantum efficiency, and CCD dark current are separately determined using a least squares fit approach. Application of correction coefficients yields significant variability reduction in flat-field images; comparable results are obtained when applied to ground test images. |
| first_indexed | 2024-12-10T16:44:21Z |
| format | Article |
| id | doaj.art-8b16f4ac834241da8a648d6ad399b808 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-12-10T16:44:21Z |
| publishDate | 2010-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-8b16f4ac834241da8a648d6ad399b8082022-12-22T01:41:07ZengMDPI AGRemote Sensing2072-42922010-02-012246447710.3390/rs2020464Radiometric Calibration for AgCamEdward HildumLianbo HuHojin KimXiaodong ZhangChangyong DouDoug OlsenThe student-built Agricultural Camera (AgCam) now onboard the International Space Station observes the Earth surface through two linescan cameras with Charge-Coupled Device (CCD) arrays sensitive to visible and near-infrared wavelengths, respectively. The electro-optical components of the AgCam were characterized using precision calibration equipment; a method for modeling and applying these measurements was derived. Correction coefficients to minimize effects of optical vignetting, CCD non-uniform quantum efficiency, and CCD dark current are separately determined using a least squares fit approach. Application of correction coefficients yields significant variability reduction in flat-field images; comparable results are obtained when applied to ground test images.http://www.mdpi.com/2072-4292/2/2/464/radiometric calibrationCCD quantum efficiencyvignettingleast squares fitremote sensing |
| spellingShingle | Edward Hildum Lianbo Hu Hojin Kim Xiaodong Zhang Changyong Dou Doug Olsen Radiometric Calibration for AgCam Remote Sensing radiometric calibration CCD quantum efficiency vignetting least squares fit remote sensing |
| title | Radiometric Calibration for AgCam |
| title_full | Radiometric Calibration for AgCam |
| title_fullStr | Radiometric Calibration for AgCam |
| title_full_unstemmed | Radiometric Calibration for AgCam |
| title_short | Radiometric Calibration for AgCam |
| title_sort | radiometric calibration for agcam |
| topic | radiometric calibration CCD quantum efficiency vignetting least squares fit remote sensing |
| url | http://www.mdpi.com/2072-4292/2/2/464/ |
| work_keys_str_mv | AT edwardhildum radiometriccalibrationforagcam AT lianbohu radiometriccalibrationforagcam AT hojinkim radiometriccalibrationforagcam AT xiaodongzhang radiometriccalibrationforagcam AT changyongdou radiometriccalibrationforagcam AT dougolsen radiometriccalibrationforagcam |