Using address point interpolation - GeoTAX_Premium - 7 - 7.7

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Geo Addressing
GeoTAX Premium
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GeoTAX Premium
GeoTAX Premium for Windows, UNIX/Linux, and z/OS
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Address point interpolation uses a patented process that improves upon regular street segment interpolation by inserting point data into the interpolation process. This feature is only for use with point-level geocoding. Use the following to specify address point interpolation:

Batch processing

Use the Address Point Interpolation Option field in the CONFIG parameter card.

Integrator Series API

Use the cAddrPtInterpOpt element in the GTXINPUT parameter structure prior to calling GTXMatchAddress.

Callable Functions

Use the MCA-ADDRESS-POINT-INTERP-OPT field in the Matcher Control Area prior to Calling the GTMATCH program.

When a points database is present, more precise address geometry is used for interpolation than what is available by the use of street segments alone.

GeoTAX first attempts to find a match using the loaded points data. If an exact point match is found in the points data, then searching ceases and the point match is returned. If an exact point match was not found, GeoTAX attempts to find high and low boundary address points to use for address point interpolation.

Note: This feature does not work with point addresses in auxiliary files.

To illustrate the use of this feature, see the following example. In this example, the input house number is 71, and the points database contains address points for 67 and 77.

The street segment ranges from 11 to 501. The street segment contains shape lines describing the actual layout of the street.

GeoTAX attempts to map the points for addresses 67 and 77 onto the closest shape line. After finding a point on the centerline of the street, GeoTAX then performs the interpolation for the input house number 71 with the new street centerline points of 67 and 77.

Without this feature, GeoTAX performs an interpolation with the street segment end points of 11 and 501. This creates a far less accurate result (labeled in the diagram) than using the centerline points of the closest surrounding high and low address points.

If there is a situation where the boundaries found have the same parity but are on opposite sides of the street, in order to determine on which side of the street the address should be, address point interpolation uses information from the matched street segment.