Spatiotemporal patterns of Sentinel-2 observations at image- and pixel-level of the Mexican territory between 2015 and 2019
Por:
Solorzano, V, J., Mas, J. F., Gao, Y., Gallardo-Cruz, J. A.
Publicada:
1 nov 2020
Resumen:
Sentinel-2 imagery has the highest temporal, spectral and spatial
resolution to monitor land surface among the freely available
multispectral collections. However, the possibility to use these images
in different applications is conditioned by the number of cloudless
observations available for a certain spatiotemporal window. Thus, the
objective of this article is to analyze the number of Sentinel-2
observations available for the Mexican territory at image and pixel
level. In the first case, the total number of available images and its
cloud cover percentage was calculated; while in the second case, the
number of cloudless observations was estimated for each pixel.
Additionally, in order to take into account the territory diversity, the
monthly mean number of cloudless observations, as well as the proportion
of its surface with at least one cloudless observation in monthly,
bimonthly, trimonthly and annual intervals, was computed for each one of
the seven ecoregions of the country. The results show that annually, the
number of valid observations per pixel is between 0 and 121
observations, while in monthly evaluations, between 0 and 6.58
observations. Additionally, in the 2017-2019 period annual observations
can be obtained for the entire Mexican land surface, while in 2018-2019,
monthly or trimonthly evaluations can be achieved, depending on the
ecoregion. We consider that these results will provide useful
information for researchers that are interested in using Sentinel-2
imagery for different applications.
Filiaciones:
Mas, J. F.:
Univ Nacl Autonoma Mexico, Lab Anal Espacial, Ctr Invest Geog Ambiental, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Gao, Y.:
Univ Nacl Autonoma Mexico, Lab Anal Espacial, Ctr Invest Geog Ambiental, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Gallardo-Cruz, J. A.:
Univ Iberoamer Ciudad Mexico, Ctr Transdisciplinar Univ Sustentabilidad, Prolongac Paseo Reforma 880, Ciudad De Mexico 01219, Mexico
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