How Update IDs works

If User-IDs are modified in a coverage's feature attribute table, Update IDs should be used to update the User-IDs in the coverage's coordinate files. In Update IDs, the feature attribute table is used to determine the correct User-ID for each feature in the coverage. This value is recorded in all places where the feature User-ID is stored.

Shown below are coverage VEG and its attribute file VEG.PAT before and after the User-IDs have been modified.

	VEG.PAT (Before)

	AREA    PERIMETER   VEG#  VEG-ID
	-10.0     5.0       1         0
	2.0       3.0       2        10
	3.0       4.0       3        12
	5.0       8.0       4         0
  	
		VEG.PAT (After)
	
	AREA    PERIMETER   VEG#  VEG-ID
	-10.0     5.0       1         0
	2.0       3.0       2       111
	3.0       4.0       3       112
	5.0       8.0       4         0