Recoding

Producer Field Guide

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Class values can be recoded to new values. Recoding involves the assignment of new values to one or more classes. Recoding is used to:

  • reduce the number of classes
  • combine classes
  • assign different class values to existing classes

When an ordinal, ratio, or interval class numbering system is used, recoding can be used to assign classes to appropriate values. Recoding is often performed to make later steps easier. For example, in creating a model that outputs good, better, and best areas, it may be beneficial to recode the input layers so all of the best classes have the highest class values.

In the following table, a land cover layer is recoded so that the most environmentally sensitive areas (Riparian and Wetlands) have higher class values.

Value

New Value

Class Name

0

0

Background

1

4

Riparian

2

1

Grassland and Scrub

3

1

Chaparral

4

4

Wetlands

5

1

Emergent Vegetation

6

1

Water

Use the Recode (GIS Analysis) function in IMAGINE Workspace or Spatial Modeler to recode layers.