SAR imagery for urban air quality

Ludovic Basly (1) , Christophe Couvercelle (1) , François Cauneau (1) , Thierry Ranchin (1) , Lucien Wald (2)

1 CEP - Centre Énergétique et Procédés
2 CEP/Sophia

This study focuses on the assessment of the potentialities of the Synthetic Aperture Radar imagery to study urban micro-climate and air quality. In urban area, air quality is quite dependent on the air flow drag which is influenced by the aerodynamic roughness parameters of the ground. These parameters are linked to the urban structural features and their typologies. They characterise the evolution of the vertical wind profile with the altitude. To extract structural features, the structure function (also called variogram) is processed on ERS images of the city of Nantes (France). A classification according to the structure function is done that leads to a mapping of the aerodynamic roughness by allotting a roughness parameter to each class.

Mots clés: Synthetic Aperture Radar image; urban micro-climate; air quality; variogram; Nantes; structure function; mapping; aerodynamic roughness length

Domaines: Planète et Univers [physics]; Sciences de la Terre; Météorologie; Sciences de l'ingénieur [physics]; Traitement du signal et de l'image [eess.SP]; Sciences de l'Homme et Société; Géographie; Informatique [cs]; Traitement du signal et de l'image [eess.SP]

Ludovic Basly, Christophe Couvercelle, François Cauneau, Thierry Ranchin, Lucien Wald. SAR imagery for urban air quality. 18th EARSeL Symposium on Operational Remote Sensing for Sustainable Development, May 1998, Enschede, Netherlands. pp.165-170. ⟨hal-00461915⟩