Q: what is the format of the census block code – Pitney Bowes MapMarker USA User Manual
Page 294
Frequently Asked Questions
MapMarker USA 25
294
User Guide
Note that MapMarker does not remove points from table rows that it does not match. If a table
contains pre-existing point objects, delete these objects before geocoding to ensure that your results
accurately reflect your current geocoding session.
If you have records for which you want to preserve pre-existing points, mark them as
non-geocodable by putting the result code “NG” into the result code column. MapMarker does not
attempt to match records with a result code of “NG” even if you choose to match all rows in a table.
Q: After geocoding, some of my records have a result code of “ND.”
What does this mean?
A:
ND stands for “No Data:” This means that the file containing the address matching data needed
for that record was not found in your data path or that the area is not licensed. You get this result if
you copy a subset of the MapMarker address dictionary to your local drive and attempt to geocode
addresses that are outside of that area.
Remember, you can include more than one directory in your MapMarker data path, and the path is
searched in the order in which it appears. This means that you can move the two-digit ZIP Code™
files for New England to your local drive and leave the complete U.S. Address Dictionary on
DVD-ROM. For example, your data path could be:
c:\MyData\mapmarker\nedata;d:\data
where c:\mapinfo\mapmarkr\nedata is the hard drive location of your New England data subset and
d:\data is the Address Dictionary DVD-ROM. The path components are separated by a semicolon.
Q: What is the significance of result codes, match codes, and location
codes?
A result code indicates the success or failure of the geocoding operation and conveys information
about the quality of the match. These codes typically start with either S (street geocode), Z (postal
geocode) or G (geographic geocode). Each character of the code indicates the level of precision of
each address component matched. See
for more information
A match code indicates the parts of the address were matched (or what address parts were changed
to achieve the match). A location code indicates the locational accuracy of the assigned geocode.
Note that an accurately placed candidate is not necessarily an ideal candidate. Examine the match
codes and result codes in addition to location codes to best evaluate the overall quality of the
candidate. See
Match Codes and Location Codes on page 305
for more information.
Q: What is the format of the Census Block code?
A:
MapMarker can return the full 15-digit Census Block ID only for a successfully geocoded record
with an S8, S7, S5 result code. An S4 can return a complete 15-character Census Block ID, but only
if the block groups on each side of the street are the same and if a house number is provided. An S3
result can return no more than a 12-digit Census Block Group number.