% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/ddbs_ops_unary.R
\name{ddbs_remove_repeated_points}
\alias{ddbs_remove_repeated_points}
\title{Remove repeated points from a geometry}
\usage{
ddbs_remove_repeated_points(
  x,
  tolerance = 0,
  conn = NULL,
  name = NULL,
  mode = NULL,
  overwrite = FALSE,
  quiet = FALSE
)
}
\arguments{
\item{x}{Input spatial data. Can be:
\itemize{
\item A \code{duckspatial_df} object (lazy spatial data frame via dbplyr)
\item An \code{sf} object
\item A \code{tbl_lazy} from dbplyr
\item A character string naming a table/view in \code{conn}
}
Data is returned from this object.}

\item{tolerance}{A numeric value specifying the minimum distance between
consecutive vertices. Vertices closer than this threshold are considered
repeated and removed. Default is \code{0}, which removes only exact
duplicates.}

\item{conn}{A connection object to a DuckDB database. If \code{NULL}, the function
runs on a temporary DuckDB database.}

\item{name}{A character string of length one specifying the name of the table,
or a character string of length two specifying the schema and table
names. If \code{NULL} (the default), the function returns the result as an
\code{sf} object}

\item{mode}{Character. Controls the return type. Options:
\itemize{
\item \code{"duckspatial"} (default): Lazy spatial data frame backed by dbplyr/DuckDB
\item \code{"sf"}: Eagerly collected sf object (uses memory)
}
Can be set globally via \code{\link{ddbs_options}(mode = "...")} or
per-function via this argument. Per-function overrides global setting.}

\item{overwrite}{Boolean. whether to overwrite the existing table if it exists. Defaults
to \code{FALSE}. This argument is ignored when \code{name} is \code{NULL}.}

\item{quiet}{A logical value. If \code{TRUE}, suppresses any informational messages.
Defaults to \code{FALSE}.}
}
\value{
Depends on the \code{mode} argument (or global preference set by \code{\link{ddbs_options}}):
\itemize{
\item \code{duckspatial} (default): A \code{duckspatial_df} (lazy spatial data frame) backed by dbplyr/DuckDB.
\item \code{sf}: An eagerly collected object in R memory, that will return the same data type as the
\code{sf} equivalent (e.g. \code{sf} or \code{units} vector).
}
When \code{name} is provided, the result is also written as a table or view in DuckDB and the function returns \code{TRUE} (invisibly).
}
\description{
Removes duplicate consecutive vertices from geometries, optionally within
a tolerance distance.
}
\examples{
\dontrun{
## load package
library(duckspatial)
library(sf)

## Create a polygon with repeated points
poly <- st_polygon(list(matrix(
  c(0, 0,
    1, 0,
    1, 0,  # repeated point
    1, 1,
    0, 1,
    0, 0),
  ncol = 2, byrow = TRUE
)))

poly_sf <- st_as_sf(st_sfc(poly))

## remove exact duplicate consecutive vertices
ddbs_remove_repeated_points(poly_sf)

## remove vertices within a tolerance of 1 unit
ddbs_remove_repeated_points(poly_sf, tolerance = 1)
}
}
