Places and coordinates (v2.1.x - Android)

Owned by Sergey Poluyanov [Android] (Unlicensed)
Last updated: Jan 30, 2024 by Roman Teterin (Unlicensed)
2 min read

Coordinates

Geo locations in Navmii SDK are represented as instances of the read-only MapCoordinates class. It has three methods: getLatitude (returns values in the range [-90, 90]), getLongitude (returns values in the range [-180, 180)) and getDistanceTo.

getDistanceTo calculates the distance between the current point and a specified point, returning the result in meters. This method computes the geographical distance using the latitude and longitude values provided in the MapCoordinates object.

Example:

// New York City coordinates
MapCoordinates destination = new MapCoordinates(40.7128, -74.0060);
double distance = currentLocation.getDistanceTo(destination);
System.out.println("Distance: " + distance + " meters");

Navmii SDK also has the MapRectangle class representing a rectangle area on the map. It can be created by specifying its top left and bottom right corners.

// Creates a MapRectangle by specifying top left and bottom right corners
MapCoordinates topLeft = new MapCoordinates(51.50884, -0.12924);
MapCoordinates bottomRight = new MapCoordinates(51.50754, -0.12699);
MapRectangle rectangle = new MapRectangle(topLeft, bottomRight);

Places

Navmii SDK provides a set of classes responsible for representation of addresses an places of interest (POIs). The most basic classes to represent geographical entities are City, State, and Country. City contains the following information on a city:

  • name
  • transliterated name
  • city class (an integer taking values from -1 to 15 and representing the size of the city)
  • if the city is a capital
Log.i("City", String.format("city name - %s", city.getName()));
Log.i("City", String.format("transliterated city name - %s", city.getTransliteratedName()));
Log.i("City", String.format("city class - %s", city.getCityClass()));
Log.i("City", String.format("is capital - %s", city.isCapital()));

You can retrieve a state's

  • code
  • name

from State.

Log.i("State", String.format("state name - %s", state.getName()));
Log.i("State", String.format("state code - %s", state.getCode()));

And from Country you can fetch:

  • ISO 3 Code
  • name
  • extended info

Extended info for a Country is a CountryInfo instance containing in its turn the following information:

  • country's speed units
  • country's distance units
  • country's driving side
Log.i("Country", String.format("country ISO 3 code - %s", country.getIso3Code()));
Log.i("Country", String.format("country name - %s", country.getName()));
Log.i("Country", String.format("country speed units - %s", country.getInfo().getSpeedUnits()));
Log.i("Country", String.format("country distance units - %s", country.getInfo().getDistanceUnits()));
Log.i("Country", String.format("country driving side - %s", country.getInfo().getDrivingSide()));

Addresses

The City, State and Country classes are aggregated into Address class. The Address also provides:

  • county name
  • district name
  • administrative hierarchy
  • street name
  • route number
  • house number
Log.i("Address", String.format("country name - %s", address.getCountry().getName()));
Log.i("Address", String.format("state name - %s", address.getState().getName()));
Log.i("Address", String.format("district name - %s", address.getDistrict()));
Log.i("Address", String.format("county name - %s", address.getCounty()));
Log.i("Address", String.format("city name - %s", address.getCity().getName()));
Log.i("Address", String.format("administrative hierarchy - %s", address.getAdminHierarchy()));
Log.i("Address", String.format("street name - %s", address.getStreet()));
Log.i("Address", String.format("route number - %s", address.getRouteNumber()));
Log.i("Address", String.format("house number - %s", address.getHouseNumber()));

Places of Interest

When working with Navmii SDK search services you will also meet Place instances. They represent places of interest (POIs). A Place instance can provide you with the following info:

  • POI's name
  • place type
  • geographical location
  • POI's address
  • a boolean value indicating if the address is approximated
  • POI data

POI data for a particular place is a PoiData instance containing an integer indicating the place's primary category number and an array with numbers of all categories associated with the place.

Log.i("Place", String.format("place name - %s", place.getName()));
Log.i("Place", String.format("place type - %s", place.getType()));
Log.i("Place", String.format("coordinates - %s", place.getCoordinates()));
Log.i("Place", String.format("address - %s, %s", place.getAddress().getStreet(), place.getAddress().getHouseNumber()));
Log.i("Place", String.format("is address approximated - %s", place.isAddressApproximated()));
Log.i("Place", String.format("POI category - %s", place.getPoiData().getPrimaryCategory()));

for (int category : place.getPoiData().getCategories()) {
    Log.i("Place", "POI belongs to category " + category);
}

Images

A place can have a set of images associated with it. To access them you can use Place.getImages() method, which returns an array of PlaceImage objects containing the following fields:

  • image URL
  • thumbnail URL (optional)
  • image description (optional)