Street Address Validation/Geocoding

Introduction

In collaboration with the Treasurer/Tax Collector we are making a restful street address geocoding service available. This page describes the service. We mostly follow the OGC geocoding standard which is described here.

The Request

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

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

The the URL is case sensitive.
The service uses the street segment network only.
These data are carefully maintained by Department of Public Works, and brought into EAS on a nightly basis.
We return a single best candidate and have not implemented a scoring system.
Instead of scoring we return exceptions to help you correct the input data.
The location is based on the linear interpolation of the matching street segment.
We offset by 4 meters (about 12 feet) to the even or odd side.
For example, here is "217 4th St":

The Response

We strongly prefer JSON (available now) but we can produce XML if you buy us a beer.
The JSON is formatted for readability but your browser may obscure that.
The way to see the nicely formated JSON is to right click on the web page and select "view source".
If you use chrome or firefox you can type "ctrl-u".
If you use Internet Explore you can type "alt-v-c".
In any case, the JSON should look something like this:

{
    "inputAddressString": "100 Main St", 
    "inputZipCodeString": "94105", 
    "spatialReference": {
        "wkid": 4326
    }, 
    "foundMatch": true, 
    "foundEasMatch": false, 
    "candidates": [
        {
            "address": "100 MAIN ST", 
            "longitude": -122.39489592098057, 
            "latitude": 37.7917552676099, 
            "score": null, 
            "attributes": {
                "StreetName": "MAIN", 
                "StreetType": "ST"
            }, 
            "addressNumber": "100", 
            "street": {
                "streetNamePrimary": {
                    "base_street_name": "MAIN", 
                    "street_type": "ST"
                }, 
                "streetNameAliases": [], 
                "l_f_add": 101, 
                "l_t_add": 199, 
                "r_f_add": 100, 
                "r_t_add": 198, 
                "seg_cnn": 8628000, 
                "geometry": "MULTILINESTRING ((-122.3949402377882194 37.7918420903234775, -122.3934079394635717 37.7906126704266541))"
            }, 
            "zipCode": "94105", 
            "jurisdiction": "SF MAIN"
        }
    ], 
    "validations": [], 
    "didYouMean": []
}

Results and Performance

We have tested the DEV implementation against all of the Treasurer/Tax Collector addresses.
The canonical source of the data are here:
https://data.sfgov.org/Business-and-Economic-Development/Active-Businesses/funx-qxxn
I have also attached the data to this page.

results pending...

found street match	found eas match	count	percent

The service processes about 500 addresses per minute which should be fine for our purposes.
We have done no performance optimization so we can probably make it faster if you have a compelling reason.