geolocation | 易学教程

How to Obtain Latitude and Longitude in Android

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问题 How to obtain Latitude and longitude from the mobile device if GPS is not available... My mobile has internet Connection through wifi and gprs connection.... Can we get the lats and long from this? 回答1: edited : Network and also GPS Provider Location Yes we cam...try this LocationManager manager = (LocationManager) Context.getSystemService(Context.LOCATION_SERVICE); manager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); // additionally (you have to implement LocationListener) manager

Showing navigator.geolocation.getCurrentPosition in Baidu Maps

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We know that due to the infamous China GPS offset problem , GPS (WSG-84) map coordinates don't correspond exactly to the coordinate system that state-approved Chinese maps use (GCJ-02). The question is, how does one make sure that placing a marker via the Baidu Maps API at the coordinates reported by navigator.geolocation.getCurrentPosition() will match reality? Would the GPS chip of a device manufactured or approved for use in China return coordinates that don't match the actual position of a user, in order to instead match he GJC-02 maps? Does it matter if the user runs a Chinese navigator

City, State, Zip, Country list/script for sql server table

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I have been searching around for the best source for City, State, Zip, Country to use in an application. I have found the set at GeoNames.org and it seems very comprehensive. However there is not a simple import into SQL Server. I also believe the USPS has something similar. Does anyone know a good reliable source that is easily imported into SQL Server for this information? Or maybe even some better Googling terms? There is a script to load data from geonames in a blog I wrote a while ago. Hopefully it helps. SQL Server Zipcode Latitude/Longitude proximity distance search Why can't you just

Search for range Latitude/Longitude coordinates

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问题 This script works, but I am sure there is a better way to approach this. I have already tried storing them using the MySQL gis functionality any other suggestions would be helpful. $vicinity = .001; $lat_ceiling = floatval($lat) + floatval($vicinity); $lat_floor = floatval($lat) - floatval($vicinity); $lng_ceiling = floatval($lng) + floatval($vicinity); $lng_floor = floatval($lng) - floatval($vicinity); $query = "SELECT * FROM `geolocations` WHERE". "`latitude` <= '".$lat_ceiling."' AND

Transforming GPS coordinates for OpenLayers

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I am building a project in JavaScript that uses OpenLayers with an OpenStreetMap layer. I have the coordinates "48.3185005, 14.2853003" (the coordinated of Linz, Austria) which I get from either navigator.geolocation.getCurrentPosition() or the Google Maps Geocoding API. Now I want to show this point on the map. Which transformations are necessary for the map to display the correct location and how do I do these transformations with OpenLayers? At the moment, I am always getting some point east of Africa. This is because OpenStreetMap data is a projected coordinate system, known as Web

Retrieving Keys From GeoFire within Radius in Swift

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问题 I have the following Firebase Database JSON data structure: { "Post List" : { "-KUlvg8mCEGfY5ZSKCou" : { "addedByUser" : "7llQbPdy2NV7aO337h7ap0qLOhC3", "content" : "Post1", "cost" : "$450", "duration" : "Daily", "latitude" : "25.0879721592719", "longitude" : "55.1487715855458", "number" : "01234567890", "timestamp" : "Posted on: Sun 23 Oct" } }, "Post Locations" : { "-KUlvg8mCEGfY5ZSKCou" : { ".priority" : "thrnwznh58", "g" : "thrnwznh58", "l" : [ 25.0879721592719, 55.1487715855458 ] } },

Iphone 802.11 Scan

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I'm developing a system of indoor position use wifi. however I am having problems with relation to this library of apple. was once private is now public. where I use the code. libHandle = dlopen(”/System/Library/SystemConfiguration/IPConfiguration.bundle/IPConfiguration”, RTLD_LAZY); apple80211Open = dlsym(libHandle, “Apple80211Open”); apple80211Bind = dlsym(libHandle, “Apple80211BindToInterface”); apple80211Close = dlsym(libHandle, “Apple80211Close”); apple80211Scan = dlsym(libHandle, “Apple80211Scan”); apple80211Open(&airportHandle); apple80211Bind(airportHandle, @”en0″); this is code work

Address geolocation on own server

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Disclaimer: Any API is NO OPTION for me because of the vast amounts of places I want to process. I know there are plenty of services out there but I'd like to have my own solution Ok, after this is said here my question :) There are platforms like OpenStreetMap and maybe others who are doing very well in bringing the world of maps into the open source community. What I need I have an address located anywhere in the world and I want to compute the latitude and longitude, elevation would be nice but doesn't really matter. I've seen plenty of solutions offered around OpenStreetMap to generate

How to simulate latitude and longitude values in my browser (for geolocation testing)?

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问题 I'm developing a web app where it requires me to simulate the latitude and longitude values in my browser for geolocation testing. Has anybody has experience in testing gelocation based apps? Thanks in advance! 回答1: Faking geolocations There are many reasons why you would want to fake your location in firefox. One good reason would be “un-faking” your location on computers with no wlan cards, e.g. at work, or where there’s no data available for the WLANs around you. All you need for faking is

Quadtree Nearest Neighbour Algorithm

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问题 I have implemented a quadtree structure for n points as well as a method for returning an array of points within a given rectangle. I can't seem to find an algorithm to efficiently find the point that is closest to another given point. Am I missing something obvious? I assume a recursive solution is the correct approach? Am working in Objective C but pseudo code would be fine. Additionally I am actually storing lat, long data and the distance between points is along a great circle. EDIT: This