Week 4 videos

Dealing with tables

• Introduction 1m05s
• Binding tables 2m52s

Table joins

• Left, right, inner and full joins 3m53s
• Specifying a join in dplyr, including unmatchec attribute names 3m15s
• Unmatched types 3m53s
• R data types: use the character type for joins! 3m00s
• Niggly data mismatch issues 5m05s

Spatial tables and spatial joins

Much more on spatial joins in the next lecture!

• Quick notes on spatial joins 4m16s
• Aotearoa New Zealand census data 8m28s

Wrap

• Summary 1m13s

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Spatial data wrangling

Introduction (including the data)

• Introducing cheatsheets 2m06s
• The example data 1m47s

Spatial predicates

• Spatial predicates 3m31s
• Applying the predicates in sf 4m50s
• Counting points in polygons 3m35s

Operations between two layers

• Spatial filtering st_filter 4m42s
• Spatial joins st_join (in this one, I incorrectly refer to a function ‘st_intersect_aw’, that does not exist. I should have called it st_interpolate_aw) 11m00s
• Spatial intersection st_intersection 2m12s

Operations on a single layer applied to each geometry

• Buffers st_buffer 4m33s
• Centroids st_centroid 2m46s
• Convex hull st_convex_hull 3m50s

Operations applicable only to geometries collectively

• Voronoi polygons st_voronoi 6m52s
• Triangulation st_triangulate, also alphashapes 5m58s

Finally

• Never be afraid to ask for help! 3m37s