You just added a shapefile to your working directory, called "Chi_tracts.shp". What code would you use to read in this file in your R environment, naming it ChiTracts?

*Assume you've already imported required libraries. Just looking for the 1 line of code to read in and name the object.

Question

You just added a shapefile to your working directory, called "Chi_tracts.shp". What code would you use to read in this file in your R environment, naming it ChiTracts?

*Assume you've already imported required libraries. Just looking for the 1 line of code to read in and name the object.

BlackTom AI · Accepted Answer

Interpreting the prompt, you have a shapefile in your working directory named Chi_tracts.shp and you want to read it into R as an object named ChiTracts.

If you are using the sf package (the modern, tidy approach for vector spatial data in R):
- The one-line command to read a shapefile and assign it to ChiTracts is ChiTracts <- st_read("Chi_tracts.shp")
- This loads the shapefile into a simple features (sf) object, which is convenient for plotting and spatial operations. You don’t need to specify the layer name separately when the file path is provided; st_read infers the layer from the file name.

If you were using the older rgdal and sp approach (less common in new analyses):
- A typical one-liner would be ChiTracts <- readOGR(dsn = ".", layer = "Chi_tracts") which reads the shapefile from the current directory and assigns it to an object named ChiTracts. Note that this returns a spatial object of class SpatialPolygonsDataFrame, which differs from the sf class.

Common pitfalls to avoid:
- Forgetting to set the correct working directory, leading to a file not found error. Ensure getwd() points to the folder containing Chi_tracts.shp.
- Mixing up the file name without the .shp extension in certain functions; some interfaces require the full file path, others accept just the .shp filename.
- If the shapefile depends on accompanying files (.shx, .dbf, .prj), confirming that all parts are present in the same directory is important for successful reading.

In summary, for the concise, current practice, you would typically use the one-liner: ChiTracts <- st_read("Chi_tracts.shp").

ggis_224_120251_246163 Quiz 1

You just added a shapefile to your working directory, called "Chi_tracts.shp". What code would you use to read in this file in your R environment, naming it ChiTracts? *Assume you've already imported required libraries. Just looking for the 1 line of code to read in and name the object.

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