NAACCR Quality Metrics

The follow items describe the North American Association of Central Cancer Registries (NAACCR) quality metrics that are computed and returned along with geocodes produced by the TAMU Geocoder.

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North American Association of Central Cancer Registries (NAACCR) GIS Coordinate Quality Codes

The NAACCR GIS Coordinate Quality Codes provide an indication of the level of accuracy of a geocode.

These codes describe information about:

• The quality of the reference feature matched to - parcel vs street intersection
• The type of input data submitted - ZIP centroid of an address vs ZIP centroid of a PO Box

Code	Value	Description
98	Unknown	Latitude and longitude are assigned, but coordinate quality is unknown
00	AddressPoint	Coordinates derived from local government-maintained address points, which are based on property parcel locations, not interpolation over a street segment’s address range
01	GPS	Coordinates assigned by Global Positioning System (GPS)
02	Parcel	Coordinates are match of house number and street, and based on property parcel location
03	StreetSegmentInterpolation	Coordinates are match of house number and street, interpolated over the matching street segment’s address range
04	StreetIntersection	Coordinates are street intersections
05	StreetCentroid	Coordinates are at mid-point of street segment (missing or invalid building number)
06	AddressZIPPlus4Centroid	Coordinates are address ZIP code+4 centroid
07	AddressZIPPlus2Centroid	Coordinates are address ZIP code+2 centroid
08	ManualLookup	Coordinates were obtained manually by looking up a location on a paper or electronic map
09	AddressZIPCentroid	Coordinates are address 5-digit ZIP code centroid
10	POBoxZIPCentroid	Coordinates are point ZIP code of Post Office Box or Rural Route
11	CityCentroid	Coordinates are centroid of address city (when address ZIP code is unknown or invalid, and there are multiple ZIP codes for the city)
12	CountyCentroid	Coordinates are centroid of county
99	Unmatchable	Latitude and longitude are not assigned, but geocoding was attempted; unable to assign coordinates based on available information
	Missing	GIS Coordinate Quality not coded

North American Association of Central Cancer Registries (NAACCR) Census Tract Certainty Codes

The NAACCR Census Tract Certainty Codes provide an indication of the level of accuracy one can expect from the Census data associated with a geocode.

These codes describe information about:

• The quality of the reference feature matched to - parcel vs street intersection
• The type of input data submitted - ZIP centroid of an address vs ZIP centroid of a PO Box
• The relationship between the Census geographies matched to and the reference feature used to produce the geocode - Residence City Or ZIP With One Census Tract

Code	Value	Description
	Unknown	Unknown
1	ResidenceStreetAddress	Census tract based on complete and valid street address of residence
2	ResidenceZIPPlus4	Census tract based on residence ZIP + 4
3	ResidenceZIPPlus2	Census tract based on residence ZIP + 2
4	ResidenceZIP	Census tract based on residence ZIP code only
5	POBoxZIP	Census tract based on ZIP code of P.O. Box
6	ResidenceCityOrZIPWithOneCensusTract	Census tract/BNA based on residence city where city has only one census tract, or based on residence ZIP code where ZIP code has only one census tract
9	Missing	Not assigned, geocoding attempted
99	Unmatchable	Geocoding attempted, unable to assign
	NotAttempted	Not assigned, geocoding not attempted