This function is used to add an additional fix point to a manually created hull of a single spectrum. This fix point is then used to re-construct a continuum line.
addcp(x, ispec, cpadd)
Object of class
ID or index of spectrum to be modified.
Single value or vector of wavelength containing new fix point(s).
In some cases, it might be desirable to manually adapt automatically
constructed segmended hulls (
transformSpeclib). For example
local maxima could be removed because they are very small and maybe afflicted with uncertainties which might legitimate it to manipulate the continuum line. Therefore, hsdar provides functions to remove and add "continuum points" from or to a continuum line. Manually adapted continuum lines can then be used to update band depth or ratio transformation. Handle these functions with care to avoid continuum lines too much build by subjective decisions. In the typical workflow, spectra are first transformed
transformSpeclib). Continuum points can then be retrieved (
getcp) and manually adapted by adding
addcp and deleting (
deletecp) of points. Use
checkhull to check for errors. If all uncertainties
are removed, re-calculate the hull (
makehull) and update the
transformed spectrum (
Object of class
Clman containing the updated version of x.
Lukas Lehnert and Hanna Meyer
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## Model spectra using PROSAIL parameter <- data.frame(N = rep.int(c(1, 1.5),2), LAI = c(1,1,3,3)) spec <- PROSAIL(parameterList=parameter) ## Transform spectra spec_clman <- transformSpeclib(spec, method = "sh", out = "raw") ## Plot original line par(mfrow = c(1,2)) plot(spec_clman, ispec = 1, xlim = c(2480, 2500), ylim=c(0.022,0.024)) ## Add fix point at 4595 nm to continuum line of first spectrum spec_clman <- addcp(spec_clman, 1, 2495) ## Plot new line plot(spec_clman, ispec = 1, xlim = c(2480, 2500), ylim=c(0.022,0.024)) ## Check new hull hull <- checkhull(spec_clman, 1) hull$error
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