Geocoding - PowerPoint

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					Technical Workshops




  Geocoding –
An Introduction
      Agatha Wong
   Miriam Schmidts
Agenda


 •   What is geocoding?
 •   ArcGIS geocoding components
 •   Geocoding work flow
 •   Automating geocoding
    ArcTown, USA


         Lake
         ESRI




                                                             Grand Ave.
                                    Robert St. E
        200 198                100 100       198 200   298
        201 199                101 101       199 201   299
               Robert St. W
                                    Main St. E
        200 198                100 100       198 200
        201 199                101 101       199 201
                  Main St. W


             150 Main St. W                  105 Grand Ave
             205 Main St.
A
What is Geocoding?


  •   Geocoding: A GIS operation to transform a
      description of a location—such as a pair of
      coordinates, an address, or a name of a place—to a
      location on a map.
Ways to do Geocoding

                          Reverse


                  Batch




    Interactive
Demonstration
  Finding an address
        •   Interactive
                •   Batch
            •   Reverse
Geocoding Components

               Table of
              Addresses




 Address
 Locator         Address Locator
  Styles



                                   Features
Geocoding Work Flow

  Build or obtain
  reference data



             Determine address
                locator style



                              Build an
                           address locator



                                      Locate addresses
                                     & rematch remaining
                                          addresses
Reference Data


  •   Many sources
       -   StreetMap data
       -   Government data
       -   Data vendors
       -   ArcGIS.com


  •   Need desired level of detail
       -   Geometry Type
       -   Address Attributes
       -   Spatial Extent
Geocoding Work Flow

  Build or obtain
  reference data



             Determine address
                locator style



                              Build an
                           address locator



                                      Locate addresses
                                     & rematch remaining
                                          addresses
What is an Address Locator Style



  •   Template containing geocoding properties
  •   Choose style based on properties of:
       -   Address data: address information to geocode
       -   Reference data: geometry and attribute values
Locator Style Example


                    US Address - Dual Ranges
                     Reference Data = Lines
Locator Style Example


                        US Address - Single House
                            Reference Data =
                           Points or Polygons
Locator Style Example

                        General - Gazetteer
                         Reference Data =
                        Points or Polygons
Geocoding Work Flow

  Build or obtain
  reference data



             Determine address
                locator style



                              Build an
                           address locator



                                      Locate addresses
                                     & rematch remaining
                                          addresses
Address Locators in ArcGIS


  •   Defines the process for geocoding
  •   Self-contained dataset
       -   stores address attributes, indexes, and queries
       -   independent from the reference data
  •   Stored in a File folder or geodatabase




                                  Create new address locator
Building an address locator

            Examine address and reference data


          Open the Create New Address Locator tool


               Select an address locator style


                   Specify reference data


                    Optional: map fields


          Optional: specify a configuration keyword


              Specify Output Address Locator
Demonstration
    •   Create locators
Address Locators Inside a Geodatabase


  •   Stored as tables
  •   Always manage locators using ArcCatalog
  •   Can be copied between different workspaces
Composite Locator


  •   Combines multiple
      locators
       -   Geocode against
           multiple datasets

       -   Cascade/Fallback
           geocoding

       -   Spatially disjointed
           datasets
Composite Locator



      Specify
     Locators




     Map Fields
Geocoding Work Flow

  Build or obtain
  reference data



             Determine address
                locator style



                              Build an
                           address locator



                                      Locate addresses
                                     & rematch remaining
                                          addresses
Geocoding Toolbar

                                                    Review/
                                    Address
                                                    Rematch
                                    Inspector




                                                     Geocode
                                                     Addresses
                              Address Input box
                              (Find address in a
Manage Address Locators       single-line format)
 (List of default locators)
Find Tool


  •   Choose locator
       - Specify address
       - Show all
         candidates
       - My Places
Geocoding an address in ArcMap
Demonstration
 •   Geocode Addresses
Additional Fields in Output Feature Class

  •   Status
  •   Score
  •   Match_type
  •   Addr_type
  •   Side
  •   Match_addr
  •   Arc_Street / Arc_ZIP
Why Won't Some Addresses Match


  •   Reference Data
       -   Not current
       -   Missing address ranges
  •   Address Data
       -   Spelling errors
       -   Incorrect information (e.g. zone, address out of range)
       -   Too much info, such as PO Box or Apartment #
Review/Rematch


                   Output with
                    attributes


                    Review or
                     rematch



                                     Interactively
  Automatic         Interactively
                                    match address to
change settings   edit components
                                      pick location
Rematch Addresses Interactively
Demonstration
 •   Rematch Addresses
Automating geocoding
Dialog
                       Model Builder




                             Script




   ArcObjects
Summary – Geocoding in ArcGIS 10


  •   What is geocoding?
  •   ArcGIS geocoding components
  •   Geocoding work flow
  •   Geocoding with geoprocessing
Resources and References


  •   ESRI Resource Centers
       http://resources.arcgis.com


       -   Web Help
       -   ArcGIS Online
       -   Knowledge Base
       -   Support
       -   Developer Support
Additional Geocoding Sessions


  •   Geocoding - Advanced Techniques
         - Tuesday 10:15 AM, (Room 14B) – Offering I
         - Wednesday 3:15 PM, (Room 14B) – Offering II


  •   ESRI Showcase Software Island
         - From a table of addresses to locations on the
           map (Wednesday 10:00 AM)

  •   Visit the Spatial Analysis Island in the Exhibit Hall
                Questions ?


                      &

           Thank you for attending




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