Cost Effective Addressing

With ArcPAD 6

Green County, WI

Mostly Rural County- Population 34,000 Approximately 24,000 parcels 576 square miles

1995 SW Wisconsin Digital Orthophoto Project

70% of parcels converted

AS/400 Tax & Assessment Database Program

Manual addressing mapping

GIS Progress

Project Goals

Ability to query tax roll information by site addresses in the AS/400 system

Improve address mapping maintenance capabilities

Data confidence rate in excess of 98%

Extended GIS functionality with an eye towards future web based systems

Alternative Methods

AS400 database population

Map address points using existing address map data

Contract project out to firm specializingin address projects

Limitations

Limited Budget Needed to be < $25,000

Lack of Staff/Vehicle LTE Project Staffing

Sheriff’s Dept. donated use of vehicle

Limited Implementation Time Goal was to complete < 1 year

Solution

GPS address locations using ArcPad Software

Bonus with ArcPAD

Data compatible with County’s Arcview GIS

Easy to generate address database

Provided long term solution for maintenance

GPS Decisions

How much accuracy?Resource grade vs. Survey grade2-5 meters vs. sub-meter

At what cost?Survey grade rental - $60 daily or moreResource grade purchase - $150 - $450

Project Plan

Step 1 Pre-map address points in Arcview

Step 2 Improve locations in field & add new points

w/ArcPAD Step 3

Integrate points into address mapping environment

and spatially relate to parcel numbers

Design Considerations

Attempt to account for variations in address styles, road naming, & other anomalies

Build for future 911 database integration

Generate in a format for AS/400 environment

Final Design

Parsed address format similar 911 database

Confidence point placement rating

Full address label field for mapping needs

Pre-Project Mapping

Used existing hard copy maps and checked against tax roll and “organic” databases in office

Process took approximately 4-5 weeks for 16 towns

about

In the Field

Hardware- Dell Laptop w/ Power Converter

Parcels, centerlines and County orthophoto used for background information during process

Used TracLog option to map progress

GPS Challenges

Need to acquire data in County Coordinate System

Lack of accessibility to geodetic control point

Complexity of use for project staff

Alternate GPS Plan

Test and review resource grade GPS

Process

Live viewing in ArcPAD over photo/parcels

Pull in driveway & add data

Address Capture

Add point using GPS

Results

Estimate actual accuracies closer to 2.5 meters or less

Average PDOP was 2.2 or less-as low as 1.4 Very fast – Use ArcPAD/no other software to

configure

Lessons Learned

Used 1 set of AAA batteries per 1.5 days Satellite acquisition problems Bad weather Projection of shape files

Future Project Improvements New Earthmate- WAAS Enabled

All in one GPS/GIS- Trimble GEO-CE

Application Builder – Improve Efficiency