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2008 1
2016 2
2018 1
2021 0
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Landsat-7 ETM+ Radiometric Calibration Status.
Barsi JA, Markham BL, Czapla-Myers JS, Helder DL, Hook SJ, Schott JR, Haque O. Barsi JA, et al. Among authors: helder dl. Proc SPIE Int Soc Opt Eng. 2016;9972:99720C. doi: 10.1117/12.2238625. Epub 2016 Sep 19. Proc SPIE Int Soc Opt Eng. 2016. PMID: 29599570 Free PMC article.
Free access to Landsat imagery.
Woodcock CE, Allen R, Anderson M, Belward A, Bindschadler R, Cohen W, Gao F, Goward SN, Helder D, Helmer E, Nemani R, Oreopoulos L, Schott J, Thenkabail PS, Vermote EF, Vogelmann J, Wulder MA, Wynne R. Woodcock CE, et al. Among authors: helder d. Science. 2008 May 23;320(5879):1011. doi: 10.1126/science.320.5879.1011a. Science. 2008. PMID: 18497274 No abstract available.
CONTINUOUS CALIBRATION IMPROVEMENT: LANDSAT 5 THROUGH LANDSAT 8.
Mishra N, Helder D, Barsi J, Markham B. Mishra N, et al. Among authors: helder d. Remote Sens Environ. 2016 Oct;185:7-15. doi: 10.1016/j.rse.2016.07.032. Epub 2016 Aug 2. Remote Sens Environ. 2016. PMID: 29449747 Free PMC article.