Here is the query I use on the store locator I work with: SELECT `id`, ( 6371 * acos( cos( radians( :lat ) ) * cos( radians( `lat` ) ) * cos( radians( `long` ) – radians( :long ) ) + sin(radians(:lat)) * sin(radians(`lat`)) ) ) `distance` FROM `location` HAVING `distance` < :distance ORDER BY … Read more
What you basically need, is the distance between two points on the map: float[] results = new float[1]; Location.distanceBetween(centerLatitude, centerLongitude, testLatitude, testLongitude, results); float distanceInMeters = results[0]; boolean isWithin10km = distanceInMeters < 10000; If you have already Location objects: Location center; Location test; float distanceInMeters = center.distanceTo(test); boolean isWithin10km = distanceInMeters < 10000; Here is … Read more
You can use CLGeocoder reverseGeocodeLocation method to fetch a CLPlacemark and get its country and locality properties info. Note that it is an asynchronous method so you will need to add a completion handler to your method when fetching that info: import UIKit import MapKit import PlaygroundSupport PlaygroundPage.current.needsIndefiniteExecution = true extension CLLocation { func fetchCityAndCountry(completion: … Read more
I wrote an article about finding the bounding coordinates: http://JanMatuschek.de/LatitudeLongitudeBoundingCoordinates The article explains the formulae and also provides a Java implementation. (It also shows why IronMan’s formula for the min/max longitude is inaccurate.)
The big issue with plotting maps is that the spherical surface of the Earth cannot be conveniently converted into a flat representation. There are a bunch of different projections that attempt to resolve this. Mercator is one of the simplest: it assumes that lines of equal latitude are parallel horizontals, while lines of equal longitude … Read more
You can use the Google Geocoder service in the Google Maps API to convert from your location name to a latitude and longitude. So you need some code like: var geocoder = new google.maps.Geocoder(); var address = document.getElementById(“address”).value; geocoder.geocode( { ‘address’: address}, function(results, status) { if (status == google.maps.GeocoderStatus.OK) { // do something with the … Read more
I guess it should not be difficult to find the spherical polar coordinates from x,y,z (3d-coordinate system). r is always constant if it’s on surface. (90 – θ) your latitude (negative means it’s on the bottom) as it’s measured from top. φ is your longitude. (but not quite sure about longitude system) Also check this … Read more
Create a URI like this one: https://maps.google.com/?q=[lat],[long] For example: https://maps.google.com/?q=-37.866963,144.980615 or, if you are using the javascript API map.setCenter(new GLatLng(0,0)) This, and other helpful info comes from here: https://developers.google.com/maps/documentation/javascript/reference/?csw=1#Map
The links provided by @Marcelo & @Doc are good for understanding the derivation of the Lat Lng: http://www.cienciaviva.pt/latlong/anterior/gps.asp?accao=changelang&lang=en https://groups.google.com/forum/?hl=en&fromgroups=#!msg/google-maps-api/oJkyualxzyY/pNv1SE7qpBoJ https://en.wikipedia.org/wiki/Mercator_projection#Mathematics_of_the_Mercator_projection But if you just want an answer for the maximum bounds for Google Maps: Latitude: -85 to +85 (actually -85.05115 for some reason) Longitude: -180 to +180 Try it for yourself on the Google Maps: … Read more