sgsR
is designed to implement structurally guided sampling approaches
for enhanced forest inventories. The package was designed to function
using rasterized airborne laser scanning (ALS; Lidar) metrics to allow
for stratification of forested areas based on structure.
If you aren’t working with ALS data, any remote sensing data sets in a raster format (e.g. optical satellite imagery, climate data, drone-based products) can be used as inputs to help guide your environmental sampling needs.
sgsR
is being actively developed, so you may encounter bugs. If that
happens, please report your issue
here by providing a
reproducible example.
Install the stable version of sgsR
from
CRAN with:
install.packages("sgsR")
library(sgsR)
Install the most recent development version of sgsR
from
Github with:
install.packages("devtools")
devtools::install_github("https://github.com/tgoodbody/sgsR")
library(sgsR)
#--- Load mraster files ---#
r <- system.file("extdata", "mraster.tif", package = "sgsR")
#--- load the mraster using the terra package ---#
mraster <- terra::rast(r)
#--- apply quantiles algorithm to mraster ---#
sraster <- strat_quantiles(mraster = mraster$zq90, # use mraster as input for stratification
nStrata = 4) # produce 4 strata
#--- apply stratified sampling ---#
existing <- sample_strat(sraster = sraster, # use sraster as input for sampling
nSamp = 200, # request 200 samples
mindist = 100, # samples must be 100 m apart
plot = TRUE) # plot output
Check out the package
documentation to see how
you can use sgsR
functions for your work.
sgsR
was presented at the ForestSAT 2022 Conference in Berlin. Slides
for the presentation can be found
here.
We are thankful for continued collaboration with academic, private
industry, and government institutions to help improve sgsR
. Special
thanks to to:
Collaborator | Affiliation |
---|---|
Martin Queinnec | University of British Columbia |
Joanne C. White | Canadian Forest Service |
Piotr Tompalski | Canadian Forest Service |
Andrew T. Hudak | United States Forest Service |
Ruben Valbuena | Swedish University of Agricultural Sciences |
Antoine LeBoeuf | Ministère des Forêts, de la Faune et des Parcs |
Ian Sinclair | Ministry of Northern Development, Mines, Natural Resources and Forestry |
Grant McCartney | Forsite Consultants Ltd. |
Jean-Francois Prieur | Université de Sherbrooke |
Murray Woods | (Retired) Ministry of Northern Development, Mines, Natural Resources and Forestry |
Development of sgsR
was made possible thanks to the financial support
of the Canadian Wood Fibre Centre’s Forest Innovation Program.