A city has a complex structure and its urban fabric appears often very heterogeneous. However, relatively homogeneous quarters are delimited with classification methods from two information sources: BDTopo database produced by National Geographic Institute and images of SPOT 4 satellite. During ESCOMPTE campaign, brightness temperatures are measured from an aircraft under specific quarters of Marseille (city centre area and individual buildings area). Brightness temperatures measurements are compared with land cover on two specific quarters and a relation between the density of vegetation and brightness temperatures appears. This study is a preliminary research to analyse influence of the city structure and land cover on the local meteorology using Geographic Information System.