How do we use the agr argument in st_sf()?

How do you create an SF object?

Quote from video: In practice sf objects are usually created by reading in a shapefile or something like that however particularly for point observations.

What is an SF object in R?

At its most basic, an sf object is a collection of simple features that includes attributes and geometries in the form of a data frame. In other words, it is a data frame (or tibble) with rows of features, columns of attributes, and a special geometry column that contains the spatial aspects of the features.
 

What is the difference between SF and SP in R?

The big difference between sf and sp is that sf uses S3 classes rather than S4 as sp does. Simple features are simple data. frame objects that have a geometry list-column.

What is simple features in GIS?

Simple Features (officially Simple Feature Access) is a set of standards that specify a common storage and access model of geographic feature made of mostly two-dimensional geometries (point, line, polygon, multi-point, multi-line, etc.) used by geographic information systems.

What does ST_Transform do in R?

The ST_Transform function takes a geometry and a spatial reference system identifier as input parameters and transforms the geometry to be represented in the given spatial reference system.

What does ST stand for in SF package?

(Note: sf package functions that operate on spatial data start with st_ , which stands for “spatial” and “temporal.”)
 

What is Sfc_polygon?

sfc_polygon: sfc POLYGON in sfheaders: Converts Between R Objects and Simple Feature Objects.
 

What is SF class in R?

sf: objects with simple features



frame row, consisting of attributes and geometry. in blue a single simple feature geometry (an object of class sfg ) in red a simple feature list-column (an object of class sfc , which is a column in the data. frame )

What is SF plot?

Package sf plots projected maps in their native projection, meaning that easting and northing are mapped linearly to the x and y axis, keeping an aspect ratio of 1 (one unit east equals one unit north).

How do I get rid of geometry in R?

One important difference between dplyr with and without spatial data is that the resulting data frames will include the geometry variable unless you explicitly drop it. If you want to force the geometry to be dropped you would use the sf function st_set_geometry() and you would set the geometry to NULL .