geolocation

问题 After installing Couchbase Single Server Community Edition fonr Windows, and following the instructions for "Using Geocouch" i've found in the readme from couchbase/geocouch Github, I only get the error: {"error":"{{badmatch,{ok,11780}},\n [{vtree_bulk,omt_write_tree,4},\n {vtree_bulk,omt_write_tree,2},\n {vtree_bulk,bulk_load,4},\n {vtree,add_remove,5},\n {couch_spatial_updater,'-write_changes/4-fun-2-',5},\n {lists,zipwith,3},\n {couch_spatial_updater,write_changes,4},\n {couch_spatial

问题 I am wondering how the HTML5 Geolocation API works. What I need to know is, the obtained latitude and longitude belongs to whom? Is it the location of the ISP, as I think there is no GPS device attached to my PC or the laptop? Also if it is obtained from the SSID of the WiFi device? Does the WiFi device know it's coordinates? 回答1: From the W3C Geolocation API Specification (emphasis mine): The Geolocation API defines a high-level interface to location information associated only with the

问题 I'm programming an application where I save GPS location (lat and long) into each user info. I need to search the nearest users, I can only search using a between() function provided by my database, this function only checks if a number is between a range min and max, it's a very limited tool. Can I use this to find near users? This is a pseudo-code example of what I could do, this example finds users that their lat and long values are not more or less than 2 comparing with the target user:

问题 I faced this problem, when automating an application with protractor. Once I open a home page I get geolocation dialog with Block/Allow buttons, which didn't let proceed without selection either option It turned out, that this dialog is not an instance of alert, that's why browser.switchTo().alert().confirm() didn't work Passing '--disable-notifications' argument to Chrome also didn't solve the problem Research online didn't give any positive results. How to solve it? 回答1: The solution to the

问题 How can I check for GPS support in-App to add a feature for those with Location services enabled? My concern is, I know I'd have to specify the tag in the manifest to declare that the app uses location services, but I still want the app to function for those without. I just want to check and, if the service is available, use it; otherwise just ignore that one feature. Thanks. 回答1: You can check if any Location services are enabled by looking to see if any location providers are enabled. I'm

问题 From a List of lat/long pairs, I am trying to find nearest lat/long pair w.r.t to a given Lat/Long . For ex- List of {42_-72,42,-75,43,-76} and a given point 42,-71 The Point 42,-72 is the nearest to 42,-71, hence output => 42,-72. 回答1: I would start by creating a method that can get the distance between two points. If we consider that in any right triangle, a^2 + b^2 = c^2 , and the distance from point P1 to point P2 is c , then we can use this formula to get the distance between two points

问题 I've tried to build a webkit app using HTML5 geoposition APIs to get the current coordinates. I've also turned on the geolocation feature but it fails to start with error Failed to start Geolocation service Then I've tried to use QGetPositionInfoSource , but it can't find any available source to use. I wonder, is Positioning API supported on desktop applications? 回答1: That's a big no-no . Directly from the documentation: The Qt Positioning API provides positioning information via QML and C++

问题 I would like to create a location-aware application on WP7.5 Is it possible to automatically get a trigger on location change without our application running on background? For example: I would like to know if a user has moved in a new location. If the user has moved I would like to trigger a specific event from my application. My only concern is that if I do that from my application I will consume a significant amount of battery. Is it a specific WP7 service which can inform my application

问题 I'm having some trouble with Google Maps. I need to display user's location on the map and then update it. I'm using a default marker. However, the way my code is currently set up, it adds a new marker every time OnLocationChanged is called. I want it to just update that one marker or remove old one as it adds a new one with current location. Here's the code: public class GoogleMapActivity extends FragmentActivity implements LocationListener { Double longitude_user, latitude_user; LatLng

问题 I am trying to develop a system where the particles on the background change their speed accordingly to the speed of the device (while you are in a car or bus, for example). For this, the Geolocation API sounded like a great option, with the Coordinates.speed property. The problem is that my speed is always returning as null . From what I've read, it should be a device-related issue, but I have tried with a Nexus 6p, a Mac, a Samsung tablet and an iPad, always with the same null answer in the