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| − | + | The reflectance derived from saturated radiance is unreliable and so the saturated spectral values were discarded. Landsat 7 ETM?+ saturation can occur in any of [http://www.selleckchem.com/products/azd4547.html selleck kinase inhibitor] the reflective bands, typically when pixels contain illuminated thick cumulonimbus cloud, illuminated snow, or sunglint over water (Bindschadler et al., 2008, Cahalan et al., 2001?and?Dowdeswell and Mcintyre, 1986). Cloudy pixels were discarded using a conservative cloud screening by considering cloudy pixels as those labeled as cloudy in either the ACCA or the decision tree cloud masks. We note that neither cloud mask is perfect and cloudy pixels and sub-pixel clouds may remain (Roy et al., 2010) and even with cloudy pixel removal, aerosol properties near clouds can be different than far from clouds (Tackett & Di Girolamo, 2009), and together may result in residual atmospheric correction errors (Kaufman, 1987?and?Ouaidrari and Vermote, 1999). The percentage of sample data with surface reflectance (��s��)��s�� and surface NDVI (NDVI ?s) falling [http://en.wikipedia.org/wiki/INPP5D INPP5D] out of nominal theoretical limits was quantified. Atmospherically corrected pixels may have values outside their theoretical limits, i.e. ��s�˦�s��?>?1 or ��s�˦�s��??1 or NDVIs ??[http://www.selleckchem.com/products/Cisplatin.html this website] regression was used as it allows for both the dependent and independent variables to have error (Cohen, Maiersperger, Gower, & Turner, 2003) which is required as Landsat atmospheric correction errors are non-negligible (Ju et al., 2012) and the TOA reflectance contains 5% calibration errors (Markham & Helder, 2012). Multiple scattering of reflected radiation between the surface and the atmosphere introduces a dependency between the surface reflectance and the atmospheric contribution to the TOA reflectance (Kaufman and Sendra, 1988?and?Tanre et al., 1981). To explore the dependence of the atmospheric correction with surface reflectance, summary statistics of the difference between the surface and TOA reflectance were derived over contiguous surface reflectance ranges. | |
Поточна версія на 12:29, 14 вересня 2017
The reflectance derived from saturated radiance is unreliable and so the saturated spectral values were discarded. Landsat 7 ETM?+ saturation can occur in any of selleck kinase inhibitor the reflective bands, typically when pixels contain illuminated thick cumulonimbus cloud, illuminated snow, or sunglint over water (Bindschadler et al., 2008, Cahalan et al., 2001?and?Dowdeswell and Mcintyre, 1986). Cloudy pixels were discarded using a conservative cloud screening by considering cloudy pixels as those labeled as cloudy in either the ACCA or the decision tree cloud masks. We note that neither cloud mask is perfect and cloudy pixels and sub-pixel clouds may remain (Roy et al., 2010) and even with cloudy pixel removal, aerosol properties near clouds can be different than far from clouds (Tackett & Di Girolamo, 2009), and together may result in residual atmospheric correction errors (Kaufman, 1987?and?Ouaidrari and Vermote, 1999). The percentage of sample data with surface reflectance (��s��)��s�� and surface NDVI (NDVI ?s) falling INPP5D out of nominal theoretical limits was quantified. Atmospherically corrected pixels may have values outside their theoretical limits, i.e. ��s�˦�s��?>?1 or ��s�˦�s��??1 or NDVIs ??this website regression was used as it allows for both the dependent and independent variables to have error (Cohen, Maiersperger, Gower, & Turner, 2003) which is required as Landsat atmospheric correction errors are non-negligible (Ju et al., 2012) and the TOA reflectance contains 5% calibration errors (Markham & Helder, 2012). Multiple scattering of reflected radiation between the surface and the atmosphere introduces a dependency between the surface reflectance and the atmospheric contribution to the TOA reflectance (Kaufman and Sendra, 1988?and?Tanre et al., 1981). To explore the dependence of the atmospheric correction with surface reflectance, summary statistics of the difference between the surface and TOA reflectance were derived over contiguous surface reflectance ranges.
