ATMOSPHERIC CORRECTION METHODS FOR THE RETRIEVAL OF THE ORANGE CONTRA-BAND FROM MULTISPECTRAL DATA

The purpose of this work is to evaluate two methods of
atmospheric correction (AC) applied to multispectral images
from the Operational Land Imager (OLI) in order to retrieve
the orange contra-band (590–635 nm). It is useful to obtain
spectral information related to the presence of phycocyanin
(PC) in inland waters. This pigment concentration indicates
the presence of cyanobacteria in the water and can
be detected by remote sensors with bands covering the
absorption peak of the PC (620 nm). The AC algorithms
tested the Acolite and 6S processors and were applied
to multispectral data from the OLI multispectral sensor,
onboard Landsat 8. The orange contra-bands calculated with
the images corrected by those two methods were compared
with the one estimated with reflectance data obtained in-situ
for validation. It showed that, for this dataset, Acolite has
performed better (MAE = 1.38; BIAS = 0.87).