Download - Fundamentalsof Crime Mapping Geocoding
Fundamentals of Crime Mapping
GeoCoding in ArcMap
What is Geocoding?
Geocoding is the process of getting tabular data from a data source, comparing it to a geographic layer (like a shapefile) and then displaying the address matches in ArcGIS, at the location where the match was made
Step 1Create a table of addresses you want to match…
Access database
Comma Delimited File
Excel Spreadsheet
Geodatabase
File Geodatabase
Step 2Obtain a GIS Layer which has address information and fields to match to!
ArcGIS Shapefile
Step 3Create an address locator in Arc Catalog…
Right click on a folder andchoose NewAddress
Locator, oruse the ArcToolbox
Step 4Open ArcGIS and add the table…
Attribute Table to be geocoded with an address
Right click on table, and choose geocode addresses
Step 5Add the Address Locator…
Step 6Set up the Address Locator and geocoding options…
Address table Is the table with addresses to be geocoded
Street or Intersection and Zone
The fields in the table to try and match
Output Shapefile or Feature Class
Where are you saving the new geocoded file to?
Geocoding Options How accurate do you want the point to be?
Step 7Geocoding Options…
Spelling Sensitivity Do you want Indian Bend and Indian School to match?
Minimum candidate score What score does a recod match need to be to be considered a possible match?
Minimum match score At what score do we want to match or not match and place the point at that location?
Side offset How far away from the centerline do you want the point to be drawn?
End Offset How far away from an intersection do you want the point drawn?
Step 8OffSet Distances
Businesses Average 175 feet
Residential Average 55 feet
Overall Average Average 101 feet
From center of roadway to front door
Step 9Geocode those puppies…
Step 10Match interactively as needed…
Allows you to see why addresses are not matching and correct the problem
Time Consuming – one at a time
With this table there was no ZONE field
Step 11Map the geocoded data and understand it’s limitations…
Data quality can be a huge
issuewith some
data depending
on the scale at
which the data is
displayed
WHOAAA THAR!!!!
It’s time for a Break!