Infer Geographic Origin from Isotopic Data
Tools for inferring geographic origin from isotopic data
Combine method for wDist objects
Rescale isoscape using linear regression
data: low resolution North American growing season H isoscape
Download and unpack isoscapes from the web
Stack isoscapes
Joint probability of origin
data: database of H and O isotope data for tissues of known origin
data: North America boundary map
Odds ratio of points or regions
Probability of origin surfaces
Plot method for stacked isoscapes
Plot quality metrics for geographic assignments
Plot weighted distance and bearing distributions
Quality assessment of geographic assignments
Sample assignment using thresholds
Transform reference scale of data
data: low resolution locally weathered Sr isoscape for Michigan
data: outline of US states
Extract known origin sample data
Union probability of origin
Probability weighted distances and bearings
data: world boundary map
Routines for re-scaling isotope maps using known-origin tissue isotope data, assigning origin of unknown samples, and summarizing and assessing assignment results. Methods are adapted from Wunder (2010, in ISBN:9789048133536) and Vander Zanden, H. B. et al. (2014) <doi:10.1111/2041-210X.12229> as described in Ma, C. et al. (2020) <doi:10.1111/2041-210X.13426>.