1 research outputs found
Radiometric Correction of Simultaneously Acquired Landsat-7/Landsat-8 and Sentinel-2A Imagery Using Pseudoinvariant Areas (PIA): Contributing to the Landsat Time Series Legacy
The use of Pseudoinvariant Areas (PIA) makes it possible to carry out a reasonably robust
and automatic radiometric correction for long time series of remote sensing imagery, as shown
in previous studies for large data sets of Landsat MSS, TM, and ETM+ imagery. In addition,
they can be employed to obtain more coherence among remote sensing data from different sensors.
The present work validates the use of PIA for the radiometric correction of pairs of images acquired
almost simultaneously (Landsat-7 (ETM+) or Landsat-8 (OLI) and Sentinel-2A (MSI)). Four pairs
of images from a region in SW Spain, corresponding to four different dates, together with field
spectroradiometry measurements collected at the time of satellite overpass were used to evaluate a
PIA-based radiometric correction. The results show a high coherence between sensors (r2 = 0.964) and
excellent correlations to in-situ data for the MiraMon implementation (r2 > 0.9). Other methodological
alternatives, ATCOR3 (ETM+, OLI, MSI), SAC-QGIS (ETM+, OLI, MSI), 6S-LEDAPS (ETM+),
6S-LaSRC (OLI), and Sen2Cor-SNAP (MSI), were also evaluated. Almost all of them, except
for SAC-QGIS, provided similar results to the proposed PIA-based approach. Moreover, as the
PIA-based approach can be applied to almost any image (even to images lacking of extra atmospheric
information), it can also be used to solve the robust integration of data from new platforms, such as
Landsat-8 or Sentinel-2, to enrich global data acquired since 1972 in the Landsat program. It thus
contributes to the program’s continuity, a goal of great interest for the environmental, scientific,
and technical communityPeer reviewe