on February 7, 2023

Creating an sf object from the maps package

Geographic Information Systems

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 package is SF in R?

The sf package represents simple features as native R objects, using simple data structures (S3 classes, lists, matrices, vectors). All functions and methods in sf that operate on spatial data are prefixed by st_ , which refers to spatial and temporal.

What is the use of maps package in R?

The maps package contains a lot of outlines of continents, countries, states, and counties that have been with R for a long time. The mapdata package contains a few more, higher-resolution outlines. The maps package comes with a plotting function, but, we will opt to use ggplot2 to plot the maps in the maps package.



How to create an interactive map in R?



Knowing the tidyverse has a high return on investment and I’d recommend learning it.

  1. Step 1: Install Packages.
  2. Step 2: Load Packages.
  3. Step 3: Load Data.
  4. Step 4: Add Tiles.
  5. Step 5: Add Multiple Tiles.
  6. Step 6: Use Data to Add Markers to the Map.
  7. Step 7: Add Clusters.
  8. Step 8: Set A Starting Zoom.

How do you write SF?

6 Fantastic Tips for Writing Stellar Science Fiction

  1. Find out what your audience expects.
  2. Give your world believable structures.
  3. Don’t overwhelm readers with exposition dumps.
  4. Uncover what’s at the heart of your story.
  5. Don’t neglect your characters.
  6. Read beyond the realm of science fiction.

 

What is the object of class SF?

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 package is St_read in R?

the sf package

And st_read is a function in the sf package, it cannot be installed like that. ALWAYS read the error messages. Be sure to fix the first one before asking about subsequent errors. This is a many times duplicate.



What is SF in R studio?

sf: Simple Features for R



Binds to ‘GDAL’ for reading and writing data, to ‘GEOS’ for geometrical operations, and to ‘PROJ’ for projection conversions and datum transformations. Uses by default the ‘s2’ package for spherical geometry operations on ellipsoidal (long/lat) coordinates. Version: 1.0-9.
 

How to install a package in R?

To start working with the packages in R, we first need to install them.



For example, in RStudio, we need to complete the following steps:

  1. Click Tools → Install Packages.
  2. Select Package Archive File (. zip, . tar. gz) in the Install from: slot.
  3. Find the corresponding file on the local machine, and click Open.
  4. Click Install.

 

How do I add CRS to SF object?

A CRS can be added to sf objects in three main ways: By assigning the CRS to a pre-existing object, e.g. with st_crs(london) = “EPSG:4326” By passing a CRS to the crs argument in sf functions that create geometry objects such as st_as_sf(… crs = “EPSG:4326”) .

What does SF stand for in geometry?

Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value.



What is an SP object in R?

The sp package provides classes and methods for dealing with spatial data in R1. The spatial data structures implemented include points, lines, polygons and grids; each of them with or without attribute data.