MingChun Lee What is geocoding Geocoding is defined as the process of creating geometric representations for descriptions of locations In the case of address geocoding one generally uses points to represent desired addresses ID: 600481
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Slide1
Geocoding Addresses
Ming-Chun
LeeSlide2
What is geocoding?
Geocoding is defined as the process of creating geometric representations for descriptions of locations
In the case of address geocoding, one generally uses points to represent desired addressesSlide3
Geocoding
Geocoding is the process of assigning a location to addresses in a table by comparing the addresses to those in
a reference layer
.Slide4
Benefits of geocoding
Map customer locations
Planning deliveries
Giving directions
Planning future expansion
Internet mapping
Driving directions
Real estate
Government applications
Crime analysis
Voter validationSlide5
What do you geocode?
Tabular data with zip codes, addresses or latitude and longitude…
Text
DatabasesSlide6
Requirements for geocoding
ArcCatalog
– create address locators,
ArcMap
– geocoding, display geocoded results
Address locator – rules for assigning a location to an address
Reference layer – address locator assigns address based on information in this layerSlide7
Address locator
Specifies the method to interpret a particular type of address input, relate it with the reference data and deliver a geocoded output.
The rule base is a collection of files used to translate the address data into the desired outputSlide8
The process of geocoding:
Standardizing the address
Searching for potential candidates
Scoring each candidate
Matching address to best candidateSlide9
Standardizing the address
During
this step the address is broken into components
For example: street number, street name, street type and street directionSlide10
Searching for potential candidates
The
geocoding service searches the reference
layer to
find a feature with address components similar to your standardized address
Uses spelling sensitivity settingsSlide11
Scoring each candidate
The geocoding service assigns a value from 0 to 100 for each potential candidate
Each address component is considered in the scoring
The score will be lower if components are misspelled, incorrect or missingSlide12
Matching address to best candidate
The
geocoding service looks for the potential candidate with the highest score
If the score exceeds the minimum match score setting, then the service matches the address with that candidateSlide13
Rematching
If
unhappy with initial results, one can modify settings and geocode the table of addresses again
Also, you can interactively rematch addresses