# Rasterize points with a moving window

`rasterizeWin.Rd`

Rasterize points using a circle (or ellipse) as moving window. For each raster cell, the points (`x, y`

) that fall within the window centered on that cell are considered. A function is used to compute a summary value (e.g. "mean") for the values (`z`

) associated with these points.

This can result in much smoother results compared to the standard `rasterize`

method.

## Usage

```
# S4 method for class 'SpatVector,SpatRaster'
rasterizeWin(x, y, field, win="circle", pars, fun, ..., cvars=FALSE,
minPoints=1, fill=NA, filename="", wopt=list())
# S4 method for class 'data.frame,SpatRaster'
rasterizeWin(x, y, win="circle", pars, fun, ..., cvars=FALSE,
minPoints=1, fill=NA, filename="", wopt=list())
```

## Arguments

- x
SpatVector or matrix with at least three columns ((x, y) coordinates and a variable to be rasterized)

- y
SpatRaster

- field
character. field name in SpatVector

`x`

with the values to rasterize- win
character to choose the window type. Can be "circle", "ellipse", "rectangle", or "buffer"

- pars
parameters to define the window. If

`win="circle"`

or`win="buffer"`

, a single number to set the radius of the circle or the width of the buffer. If`win="ellipse"`

, either two numbers (the x and y-axis) or three numbers the axes and a rotation (in degrees). If`win="rectangle"`

, either two (width, height) or three (width, height) and the rotation in degrees. The unit of the radius/width/height/axis parameters is that of the coordinate reference system (it is not expressed as cells). That is, if you have a lon/lat crs, there is no conversion of degrees to meters or vice-versa.- fun
function to summarize the values for each cell. If

`cvars=FALSE`

, functions must take a numeric vector and return (in all cases) one or more numbers. If`cvars=TRUE`

, and multiple variables are used, the function must take a single argument (a data.frame with the names variables). For`win="circle"`

and`win="ellipse"`

there are two additional character values that can be used:`"distto"`

(average distance to the points from the center of the cell) and`"distbetween"`

(average distance between the points inside the window)- ...
additional named arguments passed to

`fun`

- minPoints
numeric. The minimum number of points to use. If fewer points are found in a search ellipse it is considered empty and the fill value is returned

- fill
numeric. value to use to fill cells with empty search areas

- cvars
logical. When using multiple fields, should

`fun`

operate on all of them at once? If not,`fun`

is applied to each variable separately- filename
character. Output filename

- wopt
list with additional arguments for writing files as in

`writeRaster`

## Examples

```
r <- rast(ncol=100, nrow=100, crs="local", xmin=0, xmax=50, ymin=0, ymax=50)
set.seed(100)
x <- runif(50, 5, 45)
y <- runif(50, 5, 45)
z <- sample(50)
xyz <- data.frame(x,y,z)
r <- rasterizeWin(xyz, r, fun="count", pars=5)
rfuns <- c("count", "min", "max", "mean")
x <- lapply(rfuns, function(f) rasterizeWin(xyz, r, fun=f, pars=5))
names(x) <- rfuns
x <- rast(x)
#plot(x)
```