The map layer 'Heat stress – Surface temperature' indicates where heat stress can occur during summer days. The red areas are very sensitive to heat stress, the blue areas hardly at all. The following factors play a role in the creation of this map: › the emissivity (the heat radiation from a surface); › the shadow The emissivity is determined for the upper surface: if there are trees along a road, the emissivity of the tree surface above the road has been taken into account. Emissivity and shadow are weighted based on the expected contribution each factor has to surface temperature. Accountability This map uses the height data from the Current Height File Netherlands, version 2. These have been superimposed on the land use map. Only the factors mentioned above have been taken into account to determine the heat stress. No account has been taken of wind or the estimated number of days of heat stress per year. It is therefore possible that the bottlenecks presented are not always (to that extent) recognized in practice. However, the map gives a good indication of the effect of each type of surface on the wind chill.
