Ratio data: Data that have known intervals between values and a meaningful zero value, such as population densities.
Record: A row in a table that represents a spatial feature.
Relate: A relational database operation that temporarily connects two tables by using keys or a field common to both tables.
Relational database: A database that consists of a collection of tables and uses keys to connect the tables.
Soil Survey Geographic(SSURGO) database: A database maintained by the Natural Resources Conservation Service, which archives soil survey data in 7.5-minute quadrangle units.