US Census Geocoding - trillium_discovery - trillium_quality - Latest

Trillium Control Center

Product type
Software
Portfolio
Verify
Product family
Trillium
Product
Trillium > Trillium Discovery
Version
Latest
Language
English
Product name
Trillium Quality and Discovery
Title
Trillium Control Center
Copyright
2024
First publish date
2008
Last updated
2024-10-18
Published on
2024-10-18T15:02:04.502478

The US Postal Matcher has an option to enrich address information with latitude and longitude coordinates, derived from the US Census Tables. This process is called geocoding. US Census directories are optional components that can be purchased with the US Postal Matcher.

Note: This topic describes how the Postal Matcher assigns geocodes to addresses within the United States. Geocodes for other countries are generated by the Geocoder process.

Coordinate Accuracy Levels

Latitude and longitude coordinates are returned at the following levels of accuracy. See Frequently Asked Questions for answers to some of the common questions about the US Postal Matcher Census Geocoding.

Note: The Zip+4/Zip5/City Centroid level provides for a less granular match than the True Rooftop (Interpolated Rooftop+) and the Interpolated Rooftop levels.

Geocode Level

Description

True Rooftop

(Interpolated Rooftop+)

Coordinates are accurate to the premise (house number) specified in the address. This level is enabled on the US Postal Matcher's Options tab by selecting Include Census Tables and selecting Include Address Point Census.

Interpolated Rooftop

Street segment endpoints are calculated at the rooftop level; coordinates for specific house numbers are calculated based on the interpolation of the house number within the street segment. This level is enabled on the US Postal Matcher's Options tab by selecting Include Census Tables and NOT selecting Include Address Point Census.

Street Level Coordinates are accurate to street level. Street level coordinates are linked to a specific street using the street name, city, postcode, and any other relevant address components. The coordinates are taken directly from the supplier’s data, and are start coordinates of the first segment for that street in the data.

Zip+4/Zip5 Centroid

Coordinates are accurate to the center point (centroid) of the Zip+4 (or Zip5) postal code. This level is enabled on the US Postal Matcher's Options tab by selecting ZIP5. If there is no match to the Zip+4 (or Zip5) then a match will be attempted at the Zip Code level.

City Centroid

Coordinates are accurate to the center point (centroid) of the city. This level is enabled on the US Postal Matcher's Options tab by selecting City Centroid.