Compare detrended-elevation methods side by side — compareDetrendMethods • ProcessSpace

Runs computeDetrendedRaster for each requested method and produces: a comparison figure (all methods on a shared color scale, plus difference panels against the first method), the gradeline fit diagnostic when applicable, and optionally a KMZ in which each method is a separately toggleable Google Earth overlay.

compareDetrendMethods(
  transectObject,
  rasterDir = NULL,
  methods = c("crossSection", "streamLine", "gradeline"),
  engine = NULL,
  sectionName = "detrend",
  rasterPaletteLims = c(-2, 2),
  exportKmz = FALSE
)

Arguments

transectObject: Object from the ProcessSpace pipeline (needs buildXSectionPlot to have run if "crossSection" is among the methods).
rasterDir: DEM path (unused when the DEM is stored on the object).
methods: Character vector of methods to compare.
engine: Interpolation engine passed to computeDetrendedRaster. Default NULL: each method uses its own default (krige for crossSection, broad-window IDW otherwise). Pass "idw" to compare all methods on the same smoothed engine.
sectionName: Base name for output files (<sectionName>_detrendComparison.png / .kmz).
rasterPaletteLims: Shared color-scale limits (m).
exportKmz: Logical; also write the multi-overlay KMZ.

Value

Invisibly, a list with rasters (named list of SpatRasters), comparisonPlot, differencePlot, and gradelinePlot (NULL unless "gradeline" was run).