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# Topic: radiometric conversion

| Tool | Description |
|--------|-------------|
| [i.aster.toar](i.aster.toar.md) | Calculates Top of Atmosphere Radiance/Reflectance/Brightness Temperature from ASTER DN. |
| [i.landsat.toar](i.landsat.toar.md) | Calculates top-of-atmosphere radiance or reflectance and temperature for Landsat MSS/TM/ETM+/OLI |

*See also the corresponding keyword for additional references:*

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