Abstract: In some examples, a method for generating an interactive three-dimensional quantitative thermal heat flow mapping of an environment comprises generating a three-dimensional representation of the environment, the representation comprising multiple surfaces defining respective boundaries of the environment, generating a thermal image representing a surface temperature at multiple points on respective ones of the surfaces of the environment within the three-dimensional representation, determining a measure for an ambient temperature within the environment, determining respective measures for incident radiant temperature of the surfaces, determining respective measures for the emissivity of the surfaces, providing a measure of temperature outside of a surface, calculating, at each of the multiple points, a value for the instantaneous heat flow per unit area using the measures for surface temperature, ambient temperature within the environment and incident radiant temperature of the surfaces, and using the values