lsat_calc_spectral_index: Calculate spectral indices

In logan-berner/lsatTS: An R package to facilitate retrieval, cleaning, cross-calibration, and phenological modeling of Landsat time-series data

Calculate spectral indices

Description

This function computes some widely used spectral vegetation indices. Only one index can be computed at a time. Current indices include the: Normalized Difference Vegetation Index (NDVI; Rouse et al. 1974), kernel NDVI (kNDVI; Camps-Valls et al. 2020), Green NDVI (gNDVI; Gitelson and Merzlyak 1998), Soil Adjusted Vegetation Index (SAVI; Huete 1998), Wide Dynamic Range Vegetation Index (WDRVI; Gitelson 2004), Enhanced Vegetation Index (EVI; Huete et al. 2002), 2-band EVI (EVI2; Jiang et al. 2008), Near Infrared Vegetation Index (NIRv; Badgley et al. 2017), Moisture Stress Index (MSI; Rock et al. 1986), Normalized Difference Water Index (NDWI; McFeeters 1996), Normalized Difference Moisture Index (NDMI; Gao 1996), Normalized Burn Ratio (NBR, Key and Benson 1999), Normalized Difference Infrared Index (NDII; Hardisky et al. 1983), Plant Senescence Reflectance Index (PSRI; Merzlyak et al. 1999), and the Soil-Adjusted Total Vegetation Index (SATVI; Marsett et al. 2006).

Usage

lsat_calc_spectral_index(dt, si)

Arguments

dt	Data.table containing surface reflectance data.
si	Character string specifying abbreviation of the desired spectral index.

Value

The input data.table with an appended column containing the spectral index.

Examples

data(lsat.example.dt)
lsat.dt <- lsat_format_data(lsat.example.dt)
lsat.dt <- lsat_clean_data(lsat.dt)
lsat.dt <- lsat_calc_spectral_index(lsat.dt, 'ndvi')
lsat.dt

logan-berner/lsatTS documentation built on Oct. 21, 2024, 12:23 a.m.