Yea, our geocoding process involves human review. Properties that fail to geocode are reviewed and most often the address is dirty and needs human cleaning. Some geocoding engines assign what I view as a geo-coding confidence level. Properties that fall below a certain threshold are reviewed also.

The candidate lists come from sql statements generated by perl code.

Just for kicks, here's an example of the sql (that doesn't use a lat/long filter):

insert into match_candidates (row1_id,row2_id,strat_name,status)
select t1.row_id,
       t2.row_id,
       'name_address_city_zip_county_units_weak_improved_trim_v5',
        case
         when t1.shim_id = t2.shim_id then 'good'
         else 'bad'
        end
from merge_list t1, merge_list t2
where t1.row_id < t2.row_id

-- looking for matches from the AHI-Doug source to some
-- other source
and (
      (t1.source = 'AHI-Doug' or t2.source = 'AHI-Doug') and (t1.sourc
+e != t2.source)
)


-- no duplicate matches from known phase things
-- this can be weakened to show no previous
-- matches from _any_ stratagy

and ( not exists (
                    select *
                    from match_candidates m
                    where t1.row_id = m.row1_id
                      and t2.row_id = m.row2_id
                  )
      )

-- strategy layers start here (assume at least one)
AND


-- similar name (weak)
    t1.name is not null
and t2.name is not null
and ( regexp_replace(lower(t1.name),'[^a-z ]+','','g') ~  regexp_repla
+ce(lower(t2.name),'[^a-z ]+','','g')
      or 
      regexp_replace(lower(t2.name),'[^a-z ]+','','g') ~  regexp_repla
+ce(lower(t1.name),'[^a-z ]+','','g')
)

 AND 
-- similar address (weak)
    t1.address is not null
and t2.address is not null
and ( regexp_replace(lower(t1.address),'[^a-z ]+','','g') ~  regexp_re
+place(lower(t2.address),'[^a-z ]+','','g')
      or 
      regexp_replace(lower(t2.address),'[^a-z ]+','','g') ~  regexp_re
+place(lower(t1.address),'[^a-z ]+','','g')
)

 AND 
-- similar city (weak)
    t1.city is not null
and t2.city is not null
and ( regexp_replace(lower(t1.city),'[^a-z ]+','','g') ~  regexp_repla
+ce(lower(t2.city),'[^a-z ]+','','g')
      or 
      regexp_replace(lower(t2.city),'[^a-z ]+','','g') ~  regexp_repla
+ce(lower(t1.city),'[^a-z ]+','','g')
)
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