ocx_sse: OCx SSE

In BIO-RSG/oceancolouR: Various Functions for Satellite and Data Analysis

OCx SSE

Description

Calculate the sum of squared error between in situ chl and satellite OCx chl. Called from within optimize_ocx_coefs() with the optim() function to minimize the error and get the optimal set of coefficients for the set of in situ chl / band ratios.

Usage

ocx_sse(params, insitu_chl, bandratio, alg_degree = 4, reg_method = 3)

Arguments

params	Named numeric vector (names must be a0,a1,a2,a3,a4, or fewer if using a smaller alg_degree) - coefficients of the polynomial
insitu_chl	Numeric vector of log10(in_situ_chla)
bandratio	Numeric vector of log10(band_ratio), same length as insitu_chl
alg_degree	Numeric value between 1 and 4 inclusive, polynomial degree of the algorithm (note that a 4th degree polynomial requires 5 coefficients, including the intercept term)
reg_method	Number of the regression method used in lmodel2 (see ?lmodel2 for details, default = 3, Standard Major Axis)

Value

Numeric value, sum of squared error between in situ chl and satellite chl generated using the user-specified polynomial degree and coefficients

BIO-RSG/oceancolouR documentation built on Feb. 2, 2025, 2:01 a.m.