| Description: The radiometric_type defines the specific type of radiance measurement. Possible values include "Radiance", "Radiance Factor", "Spectral Radiance", "Scaled Spectral Radiance", and "No CFA". Note: There are many more possible values, and this definition can be updated to include more examples over time. |
| Namespace Id: img | Steward: img | Class Name: Radiometric_Correction | Type: ASCII_Short_String_Collapsed |
| Minimum Value: None | Maximum Value: None | Minimum Characters: 1 | Maximum Characters: 255 |
| Unit of Measure Type: None | Default Unit Id: None | Attribute Concept: None | Conceptual Domain: SHORT_STRING |
| Status: Active | Nillable: false | Pattern: None |
| Permissible Value(s) | Value | Value Meaning |
| | No CFA | Indicates the image is not and has never been CFA encoded. In this case, Color_Filter_Array would simply not be present in the label. This value is present in case it needs to be explicitly stated that there is no CFA. |
| | Radiance Factor | Radiance Factor also known as I/F or IOF. Some images are scaled to absolute radiance units, then divided by the absolute radiance of the Sun at the top of the planet's atmosphere to generate radiance factor, or "I over F" values, where I is the radiance from the surface (scene) and F is the radiance from the Sun at the top of the planet's atmosphere. |
| | Scaled Spectral Radiance | Radiometric correction results are expressed as Spectral Radiance, but have subsequently been scaled in some way to compensate for photometric effects (for example, adjusting the brightness as if the sun was at zenith or correcting for the impact of atmospheric opacity (tau)). |
| | Spectral Radiance | Radiometric correction results are expressed in units of Spectral Radiance (generally W/m^2/sr/nm). |