Global Address Data:FAQ

← Melissa Address Table

Data Sources

What are the data sources?

As a general rule, we do not disclose our data sources. Our MAK data is built off of a combination of different sources including governmental, county level, and other providers.

Data Quality Guarantees

Are there any type of guarantees on data quality or quality assurances that can be put into place?

We are very confident in the coverage provided by the MAK table and we can give counts if there are any specific queries. If you have a specific protection you would want, we can look into it and consider some type of guarantee. We have not had any demands for guarantees in the past so it is not a regular part of our offering.

Who Uses MAT

Who uses MAT?

County Departments could use MAT for:

• Better route planning and reduced response times for first responders
• More efficient waste collection and utilities management
• Improved zoning, land use and surveying/mapping applications
• More accurate risk assessment for natural hazards

Address Types

Does this field only designate residential/business/unknown, or are there other values?

The RBDI field only indicates Residential or Business. However we also have the Address Type Indicator which gives more information about the address.

You can find a full list of the codes and their meaning here:

• Melissa Address Table Result Codes

Address Type Attribute Assignation

How is this attribute assigned, and what is the confidence level in its accuracy?

We use multiple sources to verify these attributes. The data goes though different levels of verification and are updated monthly.

Multi-Level Structure Coordinate Handling

In the case of multi-level structures, are the latitude and longitude coordinates stacked for all addresses/sub addresses within each structure?

86% of the MAT data is coded at rooftop level and 14% the Record is coded to interpolated rooftop level. (If it is interpolated: it is likely to be on the street, off of the building.)

We have a Base MAK ID which refers to the parent for suites, apartments, and PO Boxes.

• All the address will have latitude and longitude coordinates.
• If there 10 addresses in the building all the address in the building with have same latitude and longitude.
• If it is rooftop it is most likely a parcel centroid. The shape and size of the parcel will determine skew of the point from the rooftop of the building.

Latitude/Longitude Accuracy

The Latitude and Longitude accuracy is listed as rooftop level, but how many decimal places is this on the coordinates?

The accuracy is six digits after the decimal on the coordinates

Rooftop_Latitude	Rooftop_Longitude
39.194769	-77.173709

Enterprise Solution

Is there an Enterprise Solution?

The Melissa Address Table (MAT) is a comprehensive dataset of all US street addresses bound to a Melissa Address Key (MAK). The MAK is a persistent address key that maintains the lineage of each address tracking any changes.

The MAT data is consumed by government agencies, large corporations, and software companies for building different business solutions like tax products, analytics, street lookups, etc. The MAT is presented as raw data.

US Address Point Format and Pricing

How are the US Address Points delivered? What format are they delivered in? What are the price points for the various delivery options, if any?

We deliver the file via an FTP link. We can deliver the file in almost any format you request including CSV or TXT. At this time we do not have an API. For pricing information, please talk to your Melissa Sales Representative.

Address Validation

How does address validation work? Who validates it? How is accuracy ensured?

Melissa Data address validation is updated monthly.

Melissa Data is a provider of USPS certified address validation and maintains CASS/MASS and DPV certification (CASS Cycle N) as can be viewed here at the USPS site. https://postalpro.usps.com/storages/2018-04/CASSN02.TXT

In addition to the USPS data, there are millions of non USPS addresses that are imported directly from Counties all across the USA that are not delivered to by the USPS because they are rural addresses. As a premium Address Verification vendor, our MAT product leverages Melissa Data's deep experience in Address Validation gained and refined for over more than 25 years.

Spatial Column

Is there a spatial column (e.g. latitude/longitude, x/y)?

Yes. The file has latitude and longitude fields.

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12. There are standardized address field(s) including house number, street names (with pre direction, pre type, pre-modifier, post type, post direction, post modifier. These can be in one field), City, Zipcode. (Yes) We have all the address in one field and also parsed out and we provide the client with both.

Filtering Residential Addresses

Will the data allow us to filter at least Residential addresses?

Yes. There is an RBDI column which will help you filer Residential and Business addresses.

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14. Please indicate the number of records in your file for residential addresses. ( ) Need to run this before I can give you the exact number.

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15. Data will be used to review addresses for Census Bureau’s LUCA project, and may be submitted to Census Bureau. The contract should allow County to do so. (Yes)

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16. Data will be used to update County’s Address Point dataset, which is public domain. The contract will allow us to do so. (Yes)