Chapter 7: Selection, Proximity, and Overlay

Nicolas MalloyAuthor: Nicolas R. Malloy

7.1 Overview

Too often a geospatial analysis is conducted without consideration for uncertainty and error, map projections, and datums. More often, there is little regard for cartographic convention and communication design goals.  A geospatial analysis should consider the properties of geospatial data before applying GIS software tools. Chapter 7 introduces the first steps in learning how to conduct a geospatial analysis. The topics presented within should help to prepare you for more complex uses of GIS and additional geospatial courses.

Learning Outcomes

  • Recall the components, structure, and organization of a database
  • Discuss types of cardinality between database tables
  • Identify the various types of geospatial queries
  • Explain the function of comparison and Boolean operators
  • Construct an expression using SQL
  • Define the four basic operations used in spatial queries
  • Describe the scope of geospatial analysis operations
  • Execute an proximity analysis
  • Compare different methods of overlay analysis