Assign unique ID to each polygon

Question

I feel like this should be really simple and I am missing something. All I wish to do is assign a unique ID to each polygon since I have multiple identical FID values. In MS excel I would simply type 1 then run this value down the rows of the column and it would automatically assign 1,2,3.....n. Can I do something in Arc10? Thanks

Answer 1

According to http://forums.arcgis.com/threads/6710-GIVING-SEQUENTIAL-NUMBERS-TO-A-FIELD

Copy the following code to the field calculator code block (python):

rec=0
def autoIncrement():
 global rec
 pStart = 1 #adjust start value, if req'd 
 pInterval = 1 #adjust interval value, if req'd
 if (rec == 0): 
  rec = pStart 
 else: 
  rec = rec + pInterval 
 return rec

Copy this to the window below the code block:

autoIncrement()

Answer 2

Try this;

1. Right click on the field to be calculated and Choose "Calculate"
2. Type [FID]+1