8.5.1 Adding and Deleting Fields e regularly download data from the Internet for GIS projects. Often the downloaded data set contains far more attributes than we need. It is a good idea to delete those fields that are not needed. This not only reduces confusion in using the data set but also saves computer time for data processing. Deleting a field is straightforward. It requires specifying an attribute table and the field in the table to be deleted.
Adding a field is required for the classification or computation of attribute data. The new field is designed to receive the result of classification or computation. To add a field, we must define the field in the same way as for attribute data entry.