Alternate Name	Item#	Length	Source of Standard	Column #
	366	2	NAACCR	422-423

Description
Code indicating the basis of assignment of latitude and longitude coordinates for an individual record from an address. This data item is helpful in identifying cases that were assigned coordinates based on incomplete information, post office boxes, or rural routes. This item is coded at the central registry, not by the reporting facility. Most of the time, this information is provided by geocoding software. Alternatively, a central registry staff member manually assigns the code. Codes are hierarchical, with lower numbers having priority.

Rationale
Spatial analysis of cancer data often requires identifying data records with a high degree of geographic precision. Researchers can use this code as a basis for selecting records with a degree of precision that is appropriate to the study.

Codes

00	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	Coordinates assigned by Global Positioning System (GPS)
02	Coordinates are match of house number and street, and based on property parcel location
03	Coordinates are match of house number and street, interpolated over the matching street segment's address range
04	Coordinates are street intersections
05	Coordinates are at mid-point of street segment (missing or invalid building number)
06	Coordinates are address ZIP code+4 centroid
07	Coordinates are address ZIP code+2 centroid
08	Coordinates were obtained manually by looking up a location on a paper or electronic map
09	Coordinates are address 5-digit ZIP code centroid
10	Coordinates are point ZIP code of Post Office Box or Rural Route
11	Coordinates are centroid of address city (when address ZIP code is unknown or invalid, and there are multiple ZIP codes for the city)
12	Coordinates are centroid of county
98	Latitude and longitude are assigned, but coordinate quality is unknown
99	Latitude and longitude are not assigned, but geocoding was attempted; unable to assign coordinates based on available information
Blank	GIS Coordinate Quality not coded

Instructions for Coding: Where multiple codes are applicable, use the lower code value. Note: This data item is similar in function to Census Tract Certainty 1970/80/90 [364] and Census Tract Certainty 2000 [365]. The codes for this data item and the two census tract data items all describe how location information was assigned based on the patient's resident address at the time of diagnosis.

This data item must be populated if Latitude [2352] and Longitude [2354] are also populated.