Results

The first figure represents a map of Geneva with in a) the corresponding green roofs drawn in green and in b) the thermal response obtained with Landsat 8 measurements. The city is divided into eight quarters. Some parts of the city have more vegetalized roofs in number and area than others, but in a general way the roofs are spread. The thermal map, in b), is a division into five equal intervals of the mean thermal response. If one looks closely to the image, one will be able to observe the grid resolution as a background. The reddish colour is representing a higher value, and a red-white colour corresponds to a lower value.
In the second figure, a series of graphs are represented. The equal intervals from the figure 1b) are used to separate the data to compare them. These graphs are called “Parallel Coordinate Plot” in Geoda and they permit to graphically show the influence of green roofs on the mean heat. In the four first graphs, no difference of intercepted mean range is detectable. However, in the fifth graph, one can observe a slightly difference and the values coming from the non-green roof area seem to have some higher values.