Limit rasters to focus areas

Mask and crop are similar operations that allow you to limit your raster to a specific area of interest. With mask() you essentially place your area of interest on top of the raster and any raster cells outside of the boundary are assigned NA values. A reminder that currently the raster package does not support sf objects so they will need to be converted to Spatial objects with, for example, as(input, "Spatial").

Project the preloaded parks object to match the canopy raster with st_transform() and crs(). Assign this to parks_cp.
Compute the area of the parks with st_area() and save this object as areas.
Filter the parks to only those above 30000 square meters with the filter() function. You will need to wrap areas in unclass(). Save as parks_big.
Review the plot of canopy raster.
Plot the geometry of the parks_big.
Convert the parks_big object to the Spatial class (the class from the package sp) with as(input, "Spatial") and save this as parks_sp.
Mask the canopy layer with parks_sp and save as canopy_mask. This may take a couple of seconds.
Review the plot of canopy_mask.

Take Hint (-30 XP)

Exercise

Limit rasters to focus areas

Instructions