Areal Data: Coordinates and Geometries
Content for Monday, September 11, 2023
Now that you have a bit of the fundamentals of geographic data and have had a chance to start using R, it’s time to get into more complicated workflows. To do that, you’ll have to have a bit more of a foundation in coordinates, coordinate reference systems, and geometries and how to access those in R. We’ll start there today and move into functions that change or relate geometries in the next few classes.
Readings
The introductory vignette for the
sfpackage has a lot of useful info onsfobjects and conventions.Section 2.2 on Vector Data and Sections 5.1-5.3 on Geographic Operations in Lovelace et al. (Lovelace et al. 2019) - for more details about vectors and geometric operations on vectors.
Chapter 2, Sections 1-3 and Chapter 3, Section 1 of Spatial Data Science by Edzer Pebesma and Roger Bivand (of the
sf,sp,rgeos, andrgdalpackages)
Objectives
By the end of today, you should be able to:
Define coordinate, coordinate system, datum, and coordinate reference system
Access coordinate and geometry information for simple features in
RUnderstand the rules for simple feature geometries
Access and transform the coordinate reference system for vector and raster data in
R
Slides
The slides for today’s lesson are available online as an HTML file. Use the buttons below to open the slides either as an interactive website or as a static PDF (for printing or storing for later). You can also click in the slides below and navigate through them with your left and right arrow keys.