Function reference • chopin

Parallelization core functions

Functions for parallelizing chopin, terra and sf geospatial operations

par_cut_coords(): Partition coordinates into quantile polygons

par_def_q(): Quantile definition

par_fallback(): Parallelization error fallback

par_grid(): Process a given function in the entire or partial computational grids

par_group_balanced(): Generate groups based on balanced clustering

par_group_grid(): Extension of par_group_balanced for padded grids

par_hierarchy(): Process a given function using a hierarchy in input data

par_make_grid(): Generate grid polygons

par_make_gridset(): Get a set of computational grids

par_merge_grid(): Merge adjacent grid polygons with given rules

par_multirasters(): Process a given function over multiple large rasters

chopin calculation functions

Functions for streamlining frequently used operations in exposure assessment

extract_at(): Extract raster values with point buffers or polygons

extract_at_buffer() extract_at_buffer_flat() extract_at_buffer_kernel(): Extract summarized values from raster with points and a buffer radius

extract_at_poly(): Extract summarized values from raster with generic polygons

summarize_aw(): Area weighted summary using two polygon sf or SpatVector objects

summarize_sedc(): Calculate Sum of Exponentially Decaying Contributions (SEDC) covariates

kernelfunction(): Kernel functions

Interoperability

terra-sf conversion support

dep_check(): Return the package the input object is based on

dep_switch(): Switch spatial data class

Helper functions

Miscellaneous helper functions for subsetting datasets and quick comparison between extents

clip_ras_ext(): Clip input raster with a buffered vector extent.

clip_vec_ext(): Clip to the buffered extent of input vector

is_bbox_within_reference(): Check if the data extent is inside the reference bounding box

is_within_ref(): Check if the boundary of the vector/raster object is inside the reference

reproject_b2r(): Align vector CRS to raster's

reproject_std(): Check coordinate system then reproject

vect_valid_repair(): Validate and repair input vector data

any_class_args(): Detect classes in function arguments

datamod(): Return the input's GIS data model type

ext2poly(): Generate a rectangular polygon from extent

get_clip_ext(): Setting the clipping extent

crs_check(): Check Coordinate Reference System

Dataset

Bundled data in chopin package

prediction_grid: Regular grid points in the mainland United States at 1km spatial resolution

ncpoints: Mildly clustered points in North Carolina, United States