toa_rad: toa_rad

In RichardLemoine/LSTtools: LSTtools: An R package to process thermal data derived from Landsat and MODIS images

Description

Convert the DN contained in a Landsat TIR band to TOA radiance.

Usage

toa_rad(x, band = NULL, mult = NULL, add = NULL)

Arguments

x	Image band in DN to be converted.
band	Character. Number of the band to convert.
mult	Radiance multiplicative band rescaling factor.
add	Radiance additive band rescaling factor.

Details

Convert the DN of a Landsat TIR band to TOA radiance employing the radiance multiplicative and additive band rescaling factors. If band is specified, the function reads the metadata (.txt file) directly from the work directory (folder containing bands as downloaded from NASA EarthExplorer) and automatically extracts the radiance multiplicative and additive rescaling factors. These scaling factors can be manually defined employing mult and add parameters. In this case, band is ignored.

Value

Raster layer with TOA radiance values.

References

USGS. (2019). Landsat 8 data users handbook version 4. USGS Earth Resources Observation and Science (EROS). Sioux Falls, South Dakota. USA. 106.

Examples

## Not run: # For Landsat 8 band 10 defining band and extracting scaling
# factors from metadata
toaradB10 <- toa_rad(B10, band = "10")

# For Landsat 8 band 10 defining manually the multiplicative
# and additive scaling factors
toaradB10 <- toa_rad(B10, mult = 0.00033420, add = 0.1)
## End(Not run)

RichardLemoine/LSTtools documentation built on Oct. 19, 2020, 12:50 a.m.