Explore North American Fire-Scar Records from the International Multiproxy Paleofire Database
rIMPD provides basic functions to explore and extract tree-ring data
stored on the International Multiproxy Paleofire Database (IMPD), hosted
by the National Centers for Environmental Information under the US
National Oceanic and Atmospheric Administration. The IMPD falls under
the World Data Service for Paleoclimatology (WDS-Paleo):
https://www.ncei.noaa.gov/products/paleoclimatology, and has become
the defacto warehouse for publicly-accessible tree-ring fire history
data.
For an overview of the package with some useful examples, run the
following code:
vignette(topic = "Introduction-to-rIMPD", package = "rIMPD")
Using rIMPD, you can discover the fire history sites across the North
American continent:
library(rIMPD)
library(ggplot2)
library(dplyr)
library(sf)
all_sites <- search_impd() %>%
st_as_sf(coords = c("longitude", "latitude"), crs=4326)
ggplot() +
geom_sf(data = spData::world) +
geom_sf(data = all_sites, color = "purple") +
coord_sf(xlim=c(-165, -50), ylim=c(15, 70)) +
labs(title = "North American Tree-Ring Records on the IMPD",
caption = paste0("Data current as of ", lubridate::today())
) +
theme_void()
The tree-ring data associated with each site can be obtained directly:
site_to_get <- all_sites[10, ]$studyCode
fhx <- get_impd_fhx(site_to_get)and analyzed with tools from the burnr library (Malevich et al. 2018),
for example:
library(burnr)
plot_demograph(fhx,
composite_rug = TRUE,
plot_legend = TRUE) +
labs(title = all_sites[10, ]$siteName,
subtitle = paste0("Collected by: ", all_sites[10, ]$investigators),
caption = "Tree-ring fire history plot. Each horizontal line represents the life-span
of a tree, with vertical tick marks denoting fire scars recorded in the tree rings.
At bottom, vertical dashes indicate 'widespread' fires that were recorded on 25% of
the trees.")
Funding for rIMPD was provided by the USGS Community for Data
Integration https://www.usgs.gov/centers/cdi
This software is in the public domain because it contains materials that originally came from the U.S. Geological Survey, an agency of the United States Department of Interior. For more information, see the official USGS copyright policy.
Although this software program has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS or the U.S. Government as to the accuracy and functioning of the program and related program material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
This software is provided “AS IS.”
Malevich, S.B., Guiterman, C.H., and Margolis, E.Q (2018). burnr: Fire
History Analysis and Graphics in R. Dendrochronologia 49 (June): 9–15.
https://doi.org/10.1016/j.dendro.2018.02.005