Dissolve/ based on condition

HushamMohamed

Hello, 

I would like to dissolve large  polygon feature data set(25000 units) based on 2 conditions:

1- by attribute value partially matched,  (UNIT field)  

for example

id	Unit
1	CLAY BROWN UNIT 2
2	CLAY BROWN UNIT 3
3	CLAY BROWN UNIT 4 sub unit 6
4	CLAY BROWN UNIT 5

2- only adjacent polygon should be dissolved. ( warning topology is not clean 100% , small gaps may appear)

example only rows 1,2,3 are adjacent polygon.

I would appreciate any suggestion. 

Thank you

DavidPike

Hi,

The dissolve will only dissolve adjacent features so condition 2 will be met anyway.

Regards gaps I would look at the integrate tool but be warned this will alter the existing data. I highly recommend making a copy before u do anything with it. It will also probably destroy and topology u have set up.

If u mean a partial field match I would probably add a new field such as higher level soil unit etc. And run a field calculator with a python code block to get the matches. I can write this when I get some time