Preset spectral indices definitions

Preset spectral indices definitions

Usage

spectral_indices

Format

spectral_indices

A tibble with 25 rows and 9 columns:

proxy_name

Character. Unique proxy identifier.

proxy_type

Character. One of "rabd", "raba", "ratio", "difference", "remp".

continuum_edges

List. Numeric vector of length 2, continuum anchor wavelengths in nm. NA where not applicable.

absorption_band

List. Numeric vector, trough wavelength(s) in nm. Single value for "strict", length-2 range for "max" and "mid". NA where not applicable.

index_type

Character. Calculation variant passed to the corresponding function. NA where not applicable.

bands

List. Numeric vector of length 2, band wavelengths in nm. NA where not applicable.

search_range

List. Numeric vector of length 2, search window in nm. NA defers to function default. NA where not applicable.

interpretation

Character. Typical sedimentological or biogeochemical interpretation.

reference

Character. Bibliographic reference. NA where not sourced from a specific publication.

Source

Selected from available literature. See the reference column for per-entry citations.

Details

Each row maps directly to a single function call. Columns correspond to argument names in the relevant hsi_calc_* function, so a row can be passed to a function without renaming. Columns that are not used by a given proxy_type carry NA.

Entries marked with index_type = "x" (RABA rows) use a placeholder pending finalisation of the RABA calculation variants.

The SWIR entry rabd16601690 carries NA for all spectral parameters pending verification.