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Fundamentalsof Crime Mapping Geocoding

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Geocoding is the process of matching address data from a table to locations on a geographic layer. This involves creating an address locator, adding the table to be geocoded in ArcGIS, selecting the address locator, and setting geocoding options like spelling sensitivity, minimum match scores, and offset distances. The geocoded addresses are then output to a new layer and can be mapped to understand data quality limitations.

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Fundamentalsof Crime Mapping 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
Create a table of addresses you want to match… Access database Excel Spreadsheet Comma Delimited File
Obtain a GIS Layer which has address information and fields to match to! Geodatabase File Geodatabase ArcGIS Shapefile
Create an address locator in Arc Catalog… Right click on a folder and choose NewAddress Locator, or use the ArcToolbox
Open ArcGIS and add the table… Attribute Table to be geocoded with an address Right click on table, and choose geocode addresses
Add the Address Locator…
Set 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?
Geocoding 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?
OffSet Distances Businesses Average 175 feet Residential Average 55 feet Overall Average Average 101 feet From center of roadway to front door
Geocode those puppies…
Allows you to see why Match interactively as addresses are not matching needed… and correct the problem Time Consuming – one at a time With this table there was no ZONE field
Map the geocoded data and understand it’s limitations… Data quality can be a huge issue with some data depending on the scale at which the data is displayed
WHOAAA THAR!!!! It’s time for a Break!

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Fundamentalsof Crime Mapping Geocoding

  • 2. 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
  • 3. Create a table of addresses you want to match… Access database Excel Spreadsheet Comma Delimited File
  • 4. Obtain a GIS Layer which has address information and fields to match to! Geodatabase File Geodatabase ArcGIS Shapefile
  • 5. Create an address locator in Arc Catalog… Right click on a folder and choose NewAddress Locator, or use the ArcToolbox
  • 6. Open ArcGIS and add the table… Attribute Table to be geocoded with an address Right click on table, and choose geocode addresses
  • 7. Add the Address Locator…
  • 8. Set 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?
  • 9. Geocoding 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?
  • 10. OffSet Distances Businesses Average 175 feet Residential Average 55 feet Overall Average Average 101 feet From center of roadway to front door
  • 12. Allows you to see why Match interactively as addresses are not matching needed… and correct the problem Time Consuming – one at a time With this table there was no ZONE field
  • 13. Map the geocoded data and understand it’s limitations… Data quality can be a huge issue with some data depending on the scale at which the data is displayed
  • 14. WHOAAA THAR!!!! It’s time for a Break!