Product includes a Map Controller and tools providing annual and monthly mean values for:
- Global Horizontal Irradiance
- Direct Normal Irradiance
- Diffuse Horizontal Irradiance
Click and Compare
- Multiple Locations: The Solar Prospecting Tools allow you evaluate multiple sites at once and make side-by-side comparisons.
- Technology Options: Consider different technology types (solar thermal or photovoltaic) to install by comparing data for different types of irradiance.
Print Reports and Share Data
Now you can present resource maps and data to collegues and clients by printing professional reports directly from your browser.
Unlimited Geographic Availability
With global coverage from 60° N to 48° S, select the area you want to explore from the entire globe.
Evaluate and compare sites with confidence by accessing information from a consistent dataset developed using the same methodology for the entire globe.
Access to Vaisala 3TIER Services Dashboard tools
Tailor the way you see information to the specific needs and demands of your work all within a seamless, drag and drop interface featuring customizable page layout options, scalable graphics, and multiple page views.
Prospecting data tools are made available via a client-specific dashboard interface.
Vaisala produced the first global solar irradiance map and time-series dataset at roughly three times the resolution of previous US solar datasets and at thirty times the resolution of global datasets available from NASA. Based on over a decade of satellite imagery and cutting-edge technology, our uniform methodology is supported by a large scientific and research community and results in a consistent map and dataset, enabling more accurate point-to-point comparisons.
The dataset is based on actual, half-hourly, high-resolution visible satellite imagery observations via the broadband visible wavelength channel at a 2 arc minute resolution. These data have been processed to hourly GHI, DNI, and DIF values. Vaisala processes the satellite images based on a combination of in-house research and algorithms published in peer-reviewed scientific literature. These algorithms contain parameters and coefficients that are based on empirical fits to observational data. The specific satellites and length of time varies slightly by region due to differences in the availability of data from region to region. See the chart below for more details.
GOES 8 - 13
January 1997 – last month
South Asia & Middle East
Meteosat 5, Meteosat 7
January 1999 – last month
East Asia & Oceania
GMS 5, GOES 9, MTSAT 1-2
December 1998 – last month
Europe & Africa
Meteosat 7, Meteosat 9
July 1998 – last month
To develop and validate our model, Vaisala used observations from:
- Baseline Surface Radiation Networks
- National Solar Radiation Database
- Bureau of Meteorology (Australia)
- National Institute of Water and Atmospheric Research (New Zealand)
- Indian Meteorology Department
- NREL Annex II
- Linke Turbidity Database from Ecole des Mines de Paris
- National Snow and Ice Data Center (high-resolution snow dataset)
- MODIS Aerosol Optical Depth and Water Vapor Datasets
Find our validation papers here.
If you are unfamiliar with the technical terminology on this page, please visit our Glossary for more information.