The International Daylight Measurement Programme will generate a large amount of data from distinct locations worldwide. To ensure comparability of results, data must be identified uniquely and standardisation of data analysis including the determination of derived quantities is necessary. A number of formulae are proposed for the normalisation and analysis of direct beam, global and diffuse irradiances and illuminances and sky luminance distributions. Graphical representation of results is discussed and a graphical approach, the P-G-D diagram, is put forward as a solution for irradiance and illuminance data presentation.

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Statistical analysis of new measured sky illuminance data recorded in various climatic zones in Australia has resulted in the determination of regression coefficients which specify typical skylight illuminances in these climatic zones. These illuminances have been compared with calculations using a theoretical model defining average monthly skylight conditions based on relative sunshine duration and turbidity factors in these zones. Results show that skylight availability expressed in terms of sky illuminance on a horizontal plane is closely related to the meteorological climate. From this study it is contended that sky availability in different climatic regions can be determined by relating limited selected periods of measured data to independent variables such as cloud cover and type and solar altitude.

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