point2poly_simp: Point-to-polygon interpolation, simple overlay method

In SUNGEO: Sub-National Geospatial Data Archive: Geoprocessing Toolkit

Point-to-polygon interpolation, simple overlay method

Description

Function for assigning values from a source point layer to a destination polygon layer, using simple point-in-polygon overlays

Usage

point2poly_simp(
  pointz,
  polyz,
  varz,
  char_varz = NULL,
  funz = list(function(x) {
     sum(x, na.rm = TRUE)
 }),
  na_val = NA,
  drop_na_cols = FALSE
)

Arguments

pointz	Source points layer. sf object.
polyz	Destination polygon layer. Must have identical CRS to pointz. sf object.
varz	Names of variable(s) to be assigned from source polygon layer to destination polygons. Character string or vector of character strings.
char_varz	Names of character string variable(s) in varz. Character string or vector of character strings.
funz	Aggregation function to be applied to variables specified in varz. Must take as an input a vector x. Function or list of functions.
na_val	Value to be assigned to missing values. Defaul is NA. Logical or list.
drop_na_cols	Drop columns with completely missing values. Defaul is FALSE. Logical.

Details

Assignment procedures are the same for numeric and character string variables. All variables supplied in varz are passed directly to the function specified in funz. If different sets of variables are to be aggregated with different functions, both varz and funz should be specified as lists (see examples below).

Value

Returns a sf polygon object, with variables from pointz assigned to the geometries of polyz.

Examples

# Assignment of a single variable (sums)
## Not run: 
data(hex_05_deu)
data(clea_deu2009_pt)
out_1 <- point2poly_simp(pointz=clea_deu2009_pt,
                         polyz=hex_05_deu,
                         varz="vv1")
plot(out_1["vv1"])

## End(Not run)

# Replace NA's with 0's
## Not run: 
out_2 <- point2poly_simp(pointz = clea_deu2009_pt,
                         polyz = hex_05_deu,
                         varz = "vv1",
                         na_val = 0)
plot(out_2["vv1"])

## End(Not run)

# Multiple variables, with different assignment functions
## Not run: 
out_3 <- point2poly_simp(pointz = clea_deu2009_pt,
                         polyz = hex_05_deu,
                         varz = list(
                           c("to1","pvs1_margin"),
                           c("vv1"),
                           c("incumb_pty_n","win1_pty_n")),
                         funz = list(
                           function(x){mean(x,na.rm=TRUE)},
                           function(x){sum(x,na.rm=TRUE)},
                           function(x){paste0(unique(na.omit(x)),collapse=" | ") }),
                         na_val = list(NA_real_,0,NA_character_))

## End(Not run)

SUNGEO documentation built on May 29, 2024, 6:40 a.m.