The climate rating maps were prepared for IPR Prague by the Czech Hydrometeorological Institute in 2008.

In the Environmental Atlas we present the Climate Rating Map of Prague including partial climate maps:

Insolation
The map is based on an algorithm for calculating global solar radiation.

Natural flow ventilation
The map was created by a weighted combination of a layer of topographic obstructions in eight flow directions and a layer of wind frequencies in those directions. The topographic obstacle layer was created based on a visibility analysis at 1000 x 1000 m nodal points. For each nodal point, a visibility coefficient was calculated in eight sectors (0° ± 22.5°, 45° ± 22.5°, etc.). The wind frequency layer was created using data from a non-hydrostatic model using the ATEM method.

Flow velocity
The map was created by interpolating the nodal points of wind velocity at 10 m above the ground.

Windless frequencies
The map was created by interpolating the nodal points of windless frequencies (Calm) at 10 m above the terrain.

Immission load of the area
The map is a combination of the distribution of NO2 and PM10 concentration fields.

Built-up area
The map was created by combining a raster layer of vegetation cover (NDVI) and a raster layer of urbanization, which was created from nodal points 25x25 meters. For each point, the ratio of the area of development in a 100 x 100 m square to the total area of interest (100 x 100 m) was calculated. From these calculated points, a raster urbanization layer was created using interpolation (IDW).

Example of a climate rating map in the Environmental Atlas

By aggregating the partial maps, the resulting climate rating map was created. The sub-layers and the resulting map are classified into five categories, which should be considered as relative categories, reflecting local differences within the city (1 - best for the quality rating, 5 - worst).