3.1 Topics Covered

  • Understand how projections are expressed in a coordinate reference system (CRS)
  • Be able to efficiently change from one projection to another
  • Create shape centers (mean center and centroid) for polygons
  • Construct Thiessen polygons for a point layer
  • Compute a minimum spanning tree based on the max-min distance between points
  • Operate on more than one layer
  • Dissolve areal units and compute aggregate values
  • Compute aggregate values based on a common indicator in a table
  • Implement a spatial join to carry out point in polygon operations
  • Visualize the common link between two layers
GeoDa Functions
  • File > Save As
  • Map > Shape Centers
  • Map > Thiessen Polygons
  • Map > Minimum Spanning Tree
  • Map > Add Map Layer
  • Map > Map Layer Settings
  • Tools > Dissolve
  • Table > Aggregate
  • Tools > Spatial Join
  • Map Layer Settings > Set Highlight Association
  • Map Layer Settings > Change Associate Line Color