About MCD Codes
This is a list of questions and answers about MCD codes.
- What are city codes?
City codes in Trapeze4 maps are derived from the scheme established by TIGER/Line, and compacted into numeric codes. This approach is used to maintain compatibility with earlier map versions.
- What do we gain with these codes?
An MCD code can be viewed as an alternative place (city) name, usually pertaining to a municipality within city. Often a user supplies the name for such an area when asked for the city of an address. In some maps, the place field is not well-populated. This data structure along with the algorithm used provides for handling these cases properly.
- What if the map does not have all these codes?
The address-matching algorithm can handle city codes even if only placeCode has a non-zero value; also, if no address-matching on city is desired, none of these codes are mandatory.
- Can place and MCD names overlap?
Yes, it is possible for a municipality to have the same name, or to have a city with one name and the municipality with the same name in a different city, or even a municipality that stretches over more than one city. In any case, address-matching is going to consider the particular segment "a match" if either place or MCD code maps to the name specified.