@ -14,7 +14,7 @@ With reverse geocoding with Mapzen Search, you can look up all sorts of informat
To get started with reverse geocoding, you need a [free, developer API key](https://mapzen.com/developers) and a latitude,longitude pair in decimal degrees specified with the parameters `point.lat` and `point.lon`, respectively. For example, the Eiffel Tower in Paris, France, is located at `48.858268,2.294471`. The reverse geocode query for this would be:
Notice that the first result is the Eiffel Tower (well, Tour Eiffel). The output is the standard GeoJSON format.
@ -36,31 +36,27 @@ Parameter | Type | Required | Default | Example
A basic parameter for filtering is `size`, which is used to limit the number of results returned. In the previous request that returned the Eiffel Tower (or 'Tour Eiffel', to be exact), notice that other results were returned including "Bureau de Gustave Eiffel" (a museum) and "Le Jules Verne" (a restaurant). To limit a reverse geocode to only the first result, pass the `size` parameter:
The default value for `size` is `10` and the maximum value is `40`. Specifying a value greater than `40` will override to `40` and return a warning in the response metadata.
### Filter by data source
By default, reverse geocoding returns results from any source available to Mapzen Search. To filter results by source, specify one or more valid source names in a comma-delimited list using the `sources` parameter. For example, the following request returns only results from OpenStreetMap:
By default, reverse geocoding returns results from any [data source](/data-sources.md) available to Mapzen Search. To filter results by source, specify one or more valid source names in a comma-delimited list using the `sources` parameter. For example, the following request returns only results from OpenStreetMap:
Without specifying further, reverse geocoding doesn't restrict results to a particular type (street, venue, neighbourhood, and so on). If your application is only concerned with, say, which city a latitude, longitude is closest to, then use the `layers` parameter. For example, the following request returns only results that are localities (cities and towns):
If you are performing a reverse geocode near a country boundary, and are only interested in results from one country and not the other, you can specify a country code. You can set the `boundary.country` parameter value to the alpha-2 or alpha-3 [ISO-3166 country code](https://en.wikipedia.org/wiki/ISO_3166-1). For example, the latitude,longitude pair `47.270521,9.530846` is on the boundary of Austria, Liechtenstein, and Switzerland. Without specifying a `boundary.country`, the first 10 results returned may come from all three countries. By including `boundary.country=LIE`, all 10 results will be from Liechtenstein. Here's the request in action:
rmglennon
9 years ago