IN WHICH you explore some ideas about collecting and selecting data, including using the Global Positioning System. Also you digitize and edit map data, transform spatial data, and examine combining attribute data with geographic data.
“Garbage in, garbage out.”
An often quoted, but seldom heeded, admonition in the computing world.
In the Step-by-Step section of this chapter, you will gain experience working with mostly small datasets. You will examine the “nitty-gritty” of digitizing and manipulating data. However, most GIS projects deal with large amounts of data. Sometimes these datasets are found. Sometimes data are collected from the field. What follows here is advice for getting the right data for the products that might be produced by a medium to large GIS project.