UV Index Model

Calculate a global UV-index field

This standalone calculator runs the radiative-transfer Fortran model for a selected day of year and atmospheric input fields. Explore the result on the globe or export it as CSV.

Manual calculation

Global UV index

Run a calculation to build the map

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The interactive global UV-index map will appear here after calculation.

Fortran model

Calculation inputs

Choose a day of year and optionally replace the bundled input fields with your own files.

Day of yearAn integer from 1 to 366; it determines the solar position.

Input fields

Upload your own fields only when you want to replace the model's bundled data. Invalid files are not attached.

Input file format

A headerless UTF-8 text file contains 162 consecutive latitude blocks from -80.5° to 80.5° in 1° steps. Each block starts with its latitude followed by 360 field values for longitudes from -179.5° to 179.5°.

-80.50000 value_1 value_2 … value_360 -79.50000 value_1 …

The file must contain 58,482 numbers in total. Spaces and line breaks are both valid separators, so the physical line count does not matter. Any filename extension is accepted; the maximum size is 2 MB. Latitude order must not be changed.

Download a working example for each field below. These are the same Input files used by the model by default.

Total-column ozoneClick to choose a file

Download example

OrographyClick to choose a file

Download example

Aerosol attenuationClick to choose a file

Download example

Surface albedoClick to choose a file

Download example

Cloud coverClick to choose a file

Download example