如何限制 Google Maps API 结果以防止返回对不存在的地址的估计

Question

I am creating a button on a web page to return the latitude and longitude of an address entered into a form using google maps. This works great when the address is valid but also returns results for invalid addresses. I have tried using the geometry.location_type to limit to rooftop location types but this is not good enough since google returns "rooftop" for such queries as "1 b fl" or "1 atlanta ga" - clearly invalid addresses. In the case of "1 atlanta ga" it returns a formatted_address of "401 Moreland Ave NE, Atlanta, GA 30307, USA". How do I make sure that it only returns accurate - or at least sort of accurate - results? I am not getting error messages to show up in these cases.

I tried using the location_type key but that seems to return "ROOFTOP" even in the above examples. I don't see any other keys that specify accuracy.

function geocodeAddress(address) {
    geocoder.geocode({ 'address': address }, function (results, status) {
        if (status == 'OK') {
            var locationType = results[0].geometry.location_type;
            if (results.length > 1) {
                $('#errorMessage').text('Too many results')
            } else {
                if (locationType != "ROOFTOP") {
                    $('#errorMessage').text('May not be accurate')
                }
             $('#Location_Latitude').val(results[0].geometry.location.lat());
             $('#Location_Longitude').val(results[0].geometry.location.lng());
            }
        } else {
            console.log('Unable to get coordinates at this time: ' + status);
        }
    });
}

I would like to see the error message, "May not be accurate" show up any time a close to exact match cannot be found. I say close to exact because I don't want the results to throw an error if the user doesn't type it in exactly as it is in the database and because I am only asking for address, city, and state so the country and zip code could be null.

This is the result I get back using the Georgia example above:

0:
address_components: (9) [{…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}]
formatted_address: "401 Moreland Ave NE, Atlanta, GA 30307, USA"
geometry:
location: _.R {lat: ƒ, lng: ƒ}
location_type: "ROOFTOP"
viewport: _.Cd {na: Bd, ga: xd}
__proto__: Object
place_id: "ChIJJ72T1agG9YgR7f1FJRUZsEc"
plus_code: {compound_code: "QM82+3F Atlanta, Georgia, United States", global_code: "865QQM82+3F"}
types: (5) ["bar", "establishment", "food", "point_of_interest", "restaurant"]
__proto__: Object
length: 1
__proto__: Array(0)

Answer 1

Check the "partial match" value in the response:

https://developers.google.com/maps/documentation/geocoding/intro#geocoding

• partial_match indicates that the geocoder did not return an exact match for the original request, though it was able to match part of the requested address. You may wish to examine the original request for misspellings and/or an incomplete address.

• Partial matches most often occur for street addresses that do not exist within the locality you pass in the request. Partial matches may also be returned when a request matches two or more locations in the same locality. For example, "21 Henr St, Bristol, UK" will return a partial match for both Henry Street and Henrietta Street. Note that if a request includes a misspelled address component, the geocoding service may suggest an alternative address. Suggestions triggered in this way will also be marked as a partial match.