on December 27, 2022

Comparing 2 polygon shapefiles for differences

Geographic Information Systems

How do you compare polygons?



To find the scale factor, we simply create a ratio of the lengths of two corresponding sides of two polygons. If the ratio is the same for all corresponding sides, then this is called the scale factor and the polygons are similar.
 

How do you combine two shapefile polygons?

Process

  1. Click on the Vector menu, Data Management tools, Merge Shapefiles to One
  2. Ensure the correct shapefile type is selected (points, lines, or polygons). Select the folder where the two (or more) shapefiles you want to merge are located using the Browse button.