How do I use a scale factor with Landsat Level-2 science products?
A scale factor must be applied to both Collection 1 and Collection 2 Landsat Level-2 surface reflectance and surface temperature products before using the data. Please note: Landsat Collection 1 and Collection 2 level-2 science products have different scaling factors, fill values, and are different data types (see table).
Users can apply a scale factor to the science products via a data script, through manual calculation, or within certain software programs.
| Science Product | Scale Factor | Fill Value | Data Type | Valid Range |
|---|---|---|---|---|
| Collection 1 | ||||
| Surface Reflectance | 0.0001 | -9999 | Signed 16-bit integer | 0-10000 |
| Provisional Surface Temperature | 0.1 | -9999 | Signed 16-bit integer | 0-10000 |
| Collection 2 | ||||
| Surface Reflectance | 0.0000275 + -0.2 | 0 | Unsigned 16-bit integer | 1-65455 |
| Surface Temperature | 0.00341802 + 149.0 | 0 | Unsigned 16-bit integer | 1-65455 |
Examples for scaling Landsat Collection 2 Level-2 science products
Surface Reflectance
- Landsat Collection 2 surface reflectance has a scale factor of 0.0000275 and an additional offset of -0.2 per pixel.
- For example, a pixel value of 18,639 is multiplied by 0.0000275 for the scale factor and then -0.2 is added for the additional offset to get a reflectance value of 0.313 after the scale factor is applied.
Surface Temperature
- Landsat Collection 2 surface temperature has a scale factor of 0.00341802 and an additional offset of 149.0 per pixel.
- For example, a pixel value of 44,947 is multiplied by 0.00341802 for the scale factor and 149.0 is added for the additional offset to get 302.6 Kelvin after the scale factor is applied.
Learn more: Landsat Science Products
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