My problem was fairly simple, and it turns out the solutions are simple,
too, thankfully.

My original post is at the end of this message.

Two solutions were offered. I have not had time to try either, but both are
logical and I expect either would work perfectly:

1. Geocode the new set of 500 addresses on its own. When done, bring both
geocoded themes (the theme of 4,500 geocoded addresses and the new theme of
500 geocoded addresses) into a project, taking care to make sure both themes
have identical fields. Then switch on the Geoprocessing Wizard and perform a
"Merge themes" maneuver. The result is a third theme containing the same
fields and 5,000 records. Use the merged theme to produce the map.

2. Calculate the lat/lon coordinates of each geocoded address in each file
(the file of 4,500 geocoded addresses and the file of 500 geocoded
addresses). Use the addxycoo.ave script, available free at the ArcSripts
page at ESRI, to do this. Export the tables from AV to a database manager
such as Access, append one table to the other, then bring the appended table
into the AV project and perform an "Add Event Theme" maneuver: it puts a
point on the map for each pair of coordinates. The AV manual discusses "Add
Event Theme" on pages 70 and 71.

Thanks for the instruction, everyone.

Original post:

I have geocoded 4,500 addresses. Accordingly, I have an attributes table
that contains each address as it originally appears in the database, plus a
new field, AV_ADD, which contains the address that AV references when
matching against the address file. About 80 percent of the addresses in
AV_ADD are identical to the orginal address, and thus geocoded successfully
on the first pass. The other 20 percent are different because they were
subject to interactive re-matching and thus were changed in the process.

Now I have about 500 new addresses that I want to add to the database and
geocode in addition to the 4,500 that already are geocoded. Naturally, I
want to avoid having to geocode the original 4,500 addresses all over again.
What's the best way to go about this?

My current thought is to create a new database, enter the 500 new addresses
in it, then geocode those addresses. Once the geocoding and re-matching is
complete for those 500, I could append the attributes table containing the
500 new addresses to the attributes table containing the other 4,500
addresses. Would that do the trick? Is that even possible?

---------------------------
Jeff Thomas
The Gazette
Colorado Springs
jeff@gazette.com