Creating a Statewide Creating a Statewide Geocoding Service Geocoding Service
for West Virginiafor West Virginia
2008 West Virginia 2008 West Virginia GIS ConferenceGIS Conference
What is Geocoding? Geocoding is the process used to assign a spatial location to a standard street address. Geocoder /Geocoding Engine / Single Entry / Batch
You type in:708 Sites LnMoorefield, WV 26836
You get:708 Sites Lane
Moorefield, WV 2683678` 57’ 15” W
39` 4’ 13” N
Sites Lane
Spring Ave
Lee
St
How Does it Work? Different geocoding engines use different methods. There are two approaches of geocoding an address; attribute matching and range matching. Many use a combination of both methods. Mailing Address:708 Sites LnMoorefield, WV 26836
Mailing Address:708 Sites LnMoorefield, WV 26836
Moorefield
Sites Lane
Spring Ave
Lee
St
How Does it Work? Attribute matching: using part of the address or a combination of parts that match the entry to the database. Ex. Postal Location.Mailing Address:708 Sites LnMoorefield, WV 26836
Mailing Address:708 Sites LnMoorefield, WV 26836
Moorefield
Moorefield, Moorefield,
Sites Lane
Spring Ave
Lee
St
How Does it Work? Attribute Matching: Data Entry Integrity Check. Is there…> Moorfield in West Virginia? > Yes
>Does Zipcode 26836 match Moorfield, WV ? Yes> Is there a Sites Lane within that Zipcode?
(range match)> Does the Address Number fall in the Range?
26836
Mailing Address:708 Sites LnMoorefield,
Mailing Address:708 Sites LnMoorefield, WV 26836
How Does it Work? Range Matching: Geocoding using acute, attribute rich GIS data.
I.E.Mailing Address:708 Sites LnMoorefield, WV 26836
You get:78` 57’ 15” W
39` 4’ 13” N
108 Sites Ln
How Does it Work? Attributed Street Data:
Mailing Address:708 Sites LnMoorefield, WV 26836
Name City Zip Prefix Suffix L From L To R From R To Street ID
Site Moorfield 26836 Lane 101 119 102 120 23948
Site Moorfield 26836 Lane 121 199 122 198 23948
How Does it Work? Direct Matching: Geocoding using attributed point locations.
Mailing Address:708 Sites LnMoorefield, WV 26836
You get:78` 57’ 15” W
39` 4’ 13” N
108 Sites Ln
What is Geocoding?
Who Uses Geocoding? Almost EVERYONE! General Public – Driving Directions, Maps, Site location, GIS Data Input, etc… Other State Geocoding Programs: Ohio, Oregon, Texas, more…Agencies Interested: State Tax, State Historical and Preservation Office, others?
Why can’t we use the free one?
Private Industry: Good: Autonomously Maintained Reference Dataset
Ready-builtGenerally Current in Urban Areas
Bad: Reoccurring CostsData Integrity / Data CoveragePoor Rural CoverageLicensing Restrictions
No coverage for RR addresses
Why can’t we use the free one? Even when it’s right, it’s still wrong.
Why can’t we use the free one?
West Virginia Data:Good: Higher Accuracy
Lower Overall CostDistributed BenefitsLong Term StabilityPotential Greater AccuracyNo Licensing Restrictions
(Increase of Use)
Bad: Startup Buy InIncomplete Data!!!
How Does it Work? Direct Matching: Geocoding using attributed point locations.
Mailing Address:708 Sites LnMoorefield, WV 26836
You get:78` 57’ 15” W
39` 4’ 13” N
108 Sites Ln
www.batchgeocode.com
Questions? Questions? [email protected]@mail.wvu.edu
WV GIS Technical CenterWV GIS Technical Center
2008 West Virginia 2008 West Virginia GIS ConferenceGIS Conference