- Site officiel

 

MER
13
NOV

A partir de 10h30, en salle SALTUS.

Dr. Carlos Granero Belinchon (Postdoc à l’ONERA - Palaiseau, France - dans le département DOTA - Department of Theoretical and Applied Optics)présentera sn exposé s'intitulant :

"Urban Remote Sensing: from urban heat islands to health vegetation"

Résumé : 

Today 55% of the world population lives in cities, and the quantity is expected to increase to 68% in 2050. This increase is expected to occurs specially in the asian and the african continent, where numerous megacities already exist and other are appearing now.
So, the understanding of urban environments appears as crucial for guaranteeing future human well being. In this context, spaceborn remote sensing emerges as a very useful tool, as it covers large areas usually including both cities and rural areas around, and with revisit times from several days to several weeks.
This talk is organised in two parts: urban heat island and high vegetation monitoring. Concerning urban climate, urban heat island phenomenon needs to be understood.
This requires thermal images at high spatial resolutions (about a dozen of meters) to detect urban heat island drivers, as well as their influence on heat island development. Amongst these drivers, we can find: global warming, increasing of impervious areas, human activities ...
In this first part, thermal sharpening and unmixing techniques, will be presented and compared between them. These works aims at supporting the future TRISHNA mission to sense urban area at resolutions better than 60 m. On the other hand, vegetation has been proved to play a crucial role in urban environments by influencing temperature and atmospheric pollution rates but also by affecting human well being.
Thus, urban vegetation health is an important factor in cities. In the second part of the talk, a new methodology for monitoring urban vegetation stress from Sentinel-2 imagery will be presented.