Radiometric cross Calibration of Gaofen-1 WFV Cameras Using Landsat-8 OLI Images: A Simple Image-Based Method
WFV (Wide Field of View) cameras on-board Gaofen-1 satellite (gaofen means high resolution) provide unparalleled global observations with both high spatial and high temporal resolutions. However, the accuracy of the radiometric calibration remains unknown. Using an improved cross calibration method,...
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doaj-72db0e96c09f4e40a1797836c32fdae22020-11-24T21:36:42ZengMDPI AGRemote Sensing2072-42922016-05-018541110.3390/rs8050411rs8050411Radiometric cross Calibration of Gaofen-1 WFV Cameras Using Landsat-8 OLI Images: A Simple Image-Based MethodJuan Li0Lian Feng1Xiaoping Pang2Weishu Gong3Xi Zhao4Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, ChinaState Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, ChinaChinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, ChinaDepartment of Geographical Sciences, University of Maryland, College Park, MD 20742, USAChinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, ChinaWFV (Wide Field of View) cameras on-board Gaofen-1 satellite (gaofen means high resolution) provide unparalleled global observations with both high spatial and high temporal resolutions. However, the accuracy of the radiometric calibration remains unknown. Using an improved cross calibration method, the WFV cameras were re-calibrated with well-calibrated Landsat-8 OLI (Operational Land Imager) data as reference. An objective method was proposed to guarantee the homogeneity and sufficient dynamic coverage for calibration sites and reference sensors. The USGS spectral library was used to match the most appropriate hyperspectral data, based on which the spectral band differences between WFV and OLI were adjusted. The TOA (top-of-atmosphere) reflectance of the cross-calibrated WFV agreed very well with that of OLI, with the mean differences between the two sensors less than 5% for most of the reflectance ranges of the four spectral bands, after accounting for the spectral band difference between the two sensors. Given the calibration error of 3% for Landsat-8 OLI TOA reflectance, the uncertainty of the newly-calibrated WFV should be within 8%. The newly generated calibration coefficients established confidence when using Gaofen-1 WFV observations for their further quantitative applications, and the proposed simple cross calibration method here could be easily extended to other operational or planned satellite missions.http://www.mdpi.com/2072-4292/8/5/411cross calibrationGaofen-1 WFVLandsat-8 OLIrelative spectral responsespectral libraryremote sensing |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Juan Li Lian Feng Xiaoping Pang Weishu Gong Xi Zhao |
spellingShingle |
Juan Li Lian Feng Xiaoping Pang Weishu Gong Xi Zhao Radiometric cross Calibration of Gaofen-1 WFV Cameras Using Landsat-8 OLI Images: A Simple Image-Based Method Remote Sensing cross calibration Gaofen-1 WFV Landsat-8 OLI relative spectral response spectral library remote sensing |
author_facet |
Juan Li Lian Feng Xiaoping Pang Weishu Gong Xi Zhao |
author_sort |
Juan Li |
title |
Radiometric cross Calibration of Gaofen-1 WFV Cameras Using Landsat-8 OLI Images: A Simple Image-Based Method |
title_short |
Radiometric cross Calibration of Gaofen-1 WFV Cameras Using Landsat-8 OLI Images: A Simple Image-Based Method |
title_full |
Radiometric cross Calibration of Gaofen-1 WFV Cameras Using Landsat-8 OLI Images: A Simple Image-Based Method |
title_fullStr |
Radiometric cross Calibration of Gaofen-1 WFV Cameras Using Landsat-8 OLI Images: A Simple Image-Based Method |
title_full_unstemmed |
Radiometric cross Calibration of Gaofen-1 WFV Cameras Using Landsat-8 OLI Images: A Simple Image-Based Method |
title_sort |
radiometric cross calibration of gaofen-1 wfv cameras using landsat-8 oli images: a simple image-based method |
publisher |
MDPI AG |
series |
Remote Sensing |
issn |
2072-4292 |
publishDate |
2016-05-01 |
description |
WFV (Wide Field of View) cameras on-board Gaofen-1 satellite (gaofen means high resolution) provide unparalleled global observations with both high spatial and high temporal resolutions. However, the accuracy of the radiometric calibration remains unknown. Using an improved cross calibration method, the WFV cameras were re-calibrated with well-calibrated Landsat-8 OLI (Operational Land Imager) data as reference. An objective method was proposed to guarantee the homogeneity and sufficient dynamic coverage for calibration sites and reference sensors. The USGS spectral library was used to match the most appropriate hyperspectral data, based on which the spectral band differences between WFV and OLI were adjusted. The TOA (top-of-atmosphere) reflectance of the cross-calibrated WFV agreed very well with that of OLI, with the mean differences between the two sensors less than 5% for most of the reflectance ranges of the four spectral bands, after accounting for the spectral band difference between the two sensors. Given the calibration error of 3% for Landsat-8 OLI TOA reflectance, the uncertainty of the newly-calibrated WFV should be within 8%. The newly generated calibration coefficients established confidence when using Gaofen-1 WFV observations for their further quantitative applications, and the proposed simple cross calibration method here could be easily extended to other operational or planned satellite missions. |
topic |
cross calibration Gaofen-1 WFV Landsat-8 OLI relative spectral response spectral library remote sensing |
url |
http://www.mdpi.com/2072-4292/8/5/411 |
work_keys_str_mv |
AT juanli radiometriccrosscalibrationofgaofen1wfvcamerasusinglandsat8oliimagesasimpleimagebasedmethod AT lianfeng radiometriccrosscalibrationofgaofen1wfvcamerasusinglandsat8oliimagesasimpleimagebasedmethod AT xiaopingpang radiometriccrosscalibrationofgaofen1wfvcamerasusinglandsat8oliimagesasimpleimagebasedmethod AT weishugong radiometriccrosscalibrationofgaofen1wfvcamerasusinglandsat8oliimagesasimpleimagebasedmethod AT xizhao radiometriccrosscalibrationofgaofen1wfvcamerasusinglandsat8oliimagesasimpleimagebasedmethod |
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