Session:ParcelAddress Data Maintenance - PowerPoint PPT Presentation

Title: Session:ParcelAddress Data Maintenance


1

• Session Parcel/Address Data Maintenance
• How Addresses Are Used in GIS
• Presenter Wade Kloos, ESRI
• Date Thursday, October 4, 2001

2
How Addresses Are Used In GIS

• Addresses are valuable attributes for
• managing GIS features (parcels,
• businesses, utilities,etc.)

Addresses can be used to join or relate GIS data
to other agency databases (police, sales-tax and
other non-APN based datasets)
3
The Search for Map Position

• GEOCODING also called
• ADDRESS MATCHING
• Depicting the relationship of a records address
  to a mapped street feature.

4
GeoCoding How It Works

• Interpolating Process
• Compares a records address attribute to the
  address range of a mapped feature a road.
  

• 170 Main St.

5
(No Transcript)
6
(No Transcript)
7
Scoring GeoCoded Matches
The GeoCoding process assigns a match score to
each address if the match score is over a
certain threshold, the program will map the
record.
Example Record Range
Score

• 123 Main Street 100-200 Main St.
  95
• 123 Maine St. 100-200 Main St. 80
• 123 Mane Rd. 100-200 Main St. 50/DNP
• 99 Main St. 100-200 Main St. DNP

8
GeoCoding Not an Exact Science

• Placement can be affected by

• Inconsistencies of data entry process
• Subtleties of the GeoCoding scoring methods
• The interpretive process itself
• Land use patterns

• However, GeoCoding is useful when address data is
  less than perfect

9
Another Address Location Option
Direct queries against GIS feature databases -
Polygons and Points
ISSUES Not a Batch Process unless custom
scripts are built No tolerance for dissimilar
addresses no interpolation Once matched,
placement is as accurate as features are mapped
10

• Based on parcel polygon attributes

11

• Based on point feature attributes

12
Database Conventions
To maximize usefulness of address information, a
database should have the several data fields,
including but not limited to
Street Number (numerical/alphanumeric) Street
Name Street Name Prefix Street Name Suffix Unit
Number (residential apt. or condo) Suite Number
(businesses) Address combo of number, street,
suffix, etc. City Zip Zip 2,4
13
Database Standards

• Standardization of addressing syntax is critical
  for consistent search results and integration
  with other application databases.
• Develop and adopt a master address database -
  from USPS or existing city databases both of
  which requires QC by staff
• Every field needs to be QC

14
Database Standards

• 1st vs. First
• E. Ball vs. East Ball
• Avenida del Caballo vs. Ave. Del Caballo
• King Court vs. King Ct

15
Using GIS to QC Address Data
16
Using GIS to QC Address Data