Geocoding Service

Introduction

In collaboration with Treasurer/Tax Collector and the Department of Health, we are making a restful street address geocoding service available. This page describes the service. We try to follow the OGC geocoding standard which is described here.

Contacts

Preamble

The service uses EAS addresses. While EAS addresses are bound to the street network, the results will differ significantly from a street network geocoding service. For example, if you try to geocode "100 Main St" using this service, you will get zero candidates. That's because (at the time of this writing) there is no "100 Main St" in EAS.  Although there is a street segment that supports "100 Main St" there is no building or proposed building that has that address. Why use EAS geocoding? If you want units or parcels that are associated with an address, this is probably your best bet. EAS addresses are curated and maintained (not mined) and we synchronize the streets and parcels with Dept. of Public Works on a daily  basis. To see what EAS address look like, check out the web interface which is here (internal).

The Request

Here is the URL (DEV) with an example address of "100 Main St":

http://10.250.60.189/geocode/findAddressCandidates/?f=json&Address=115%20Main%20St&Zip=94105

The the URL is case sensitive. 

The Response

We currently support JSON. Here is an example.

{
    "spatialReference": {
        "wkid": 4326
    }, 
    "candidates": [
        {
            "address": "115  MAIN ST", 
            "location": {
                "y": 37.79152826999239, 
                "x": -122.39400753158013
            }, 
            "score": 100, 
            "attributes": {
                "base_address_num": 115, 
                "base_address_suffix": null, 
                "street_name": "MAIN", 
                "street_type": "ST", 
                "zipcode": "94105", 
                "details": [
                    {
                        "address_base_flg": true, 
                        "blk_lot": "3717012", 
                        "unit_num": null
                    }, 
                    {
                        "address_base_flg": true, 
                        "blk_lot": "3717013", 
                        "unit_num": null
                    }
                ]
            }
        }
    ]
}

Results and Performance

todo - results pending

Technical Details

todo - link to view, geocoder, and tests

Example URLs

http://10.250.60.189/geocode/findAddressCandidates?f=json&Address=100 Main St&Zip=94105

http://10.250.60.189/geocode/findAddressCandidates?f=json&Address=115 Main St&Zip=94105

Example Client

Here is an example client written in python.