geolocation

Using JavaScript in the browser, how can I determine the distance from my current location to another location for which I have the latitude and longitude? Frank van Puffelen If your code runs in a browser, you can use the HTML5 geolocation API: window.navigator.geolocation.getCurrentPosition(function(pos) { console.log(pos); var lat = pos.coords.latitude; var lon = pos.coords.longitude; }) Once you know the current position and the position of your "target", you can calculate the distance between them in the way documented in this question: Calculate distance between two latitude-longitude

I tried to make my AppProject iOS 8 ready. I had read a lot about [_locationManager requestWhenInUseAuthorization]; and the entry in plist NSLocationWhenInUseUsageDescription So I changed all the necessary code lines. It works fine, but now I have copied my project again from my iOS 7 base to include new features. But when I make the changes for the iOS8 Location Privacy the Popup doesn't appear anymore. My code worked until I copied. <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0

I have seen the service like spypig.com placing a small image in the email and tracking when it is opened and from where. They track city, country, IP address etc. How is this done? How do we know when the mail is opened? And how is the image generated? How is the IP address detected and how is it possible to know location from it? Basically, in the HTML body of your email, there will be an <img> tag that would look like this : <img src="http://www.yoursite.com/tracker.php?id=123456" alt="" /> When someone reads his mail, with images enabled, the email-client will send a request to tracker.php

We have a restaurant table that has lat-long data for each row. We need to write a query that performs a search to find all restaurants within the provided radius e.g. 1 mile, 5 miles etc. We have the following query for this purpose: ***Parameters*** Longitude: -74.008680 Latitude: 40.711676 Radius: 1 mile ***Query*** SELECT * FROM restaurant WHERE ( POW( ( 69.1 * ( Longitude - -74.008680 ) * cos( 40.711676 / 57.3 ) ) , 2 ) + POW( ( 69.1 * ( Latitude - 40.711676 ) ) , 2 ) ) < ( 1 *1 ); The table has about 23k rows. The size of the result set is weird at times e.g. for a 5.4 mile search, it

Chrome and Firefox have HTML Geolocation implemented. My question is: how does it work? Do they have a Database locally and get the information from the provider then try to match it? Where is the DB stored ? Can it be accessed ? Update1: the only downside to geolocation is the browser has to ask the user for permission and this is really a bad thing for usability. I understand the security issue but still I don't see how this will become a popular solution. Update2 : Firefox is using a Google WebService to detect the location. Now this seems very strange considering they are competitors now.

Before asking for specific code examples, I just wanted to ask whether it is possible to make a query something like this pseudo code: select items from table where lat/lon = -within x miles of a certain lat/lon point- Is that doable? Or do I have to jump through some hoops? Any good approaches that could be recommended would be great! daroczig You should search for the Haversine formula, but a good start could be: Creating a Store Locator with PHP, MySQL & Google Maps - See Section 'Finding Locations with MySQL' Geo/Spatial Search with MySQL Citing from the first url: Here's the SQL statement

There are clearly a number of packages in R for all sorts of spatial analysis. That can by seen in the CRAN Task View: Analysis of Spatial Data . These packages are numerous and diverse, but all I want to do is some simple thematic maps . I have data with county and state FIPS codes and I have ESRI shape files of county and state boundaries and the accompanying FIPS codes which allows joining with the data. The shape files could be easily converted to other formats, if needed. So what's the most straight forward way to create thematic maps with R? This map looks like it was created with an

My client would like me to implement geolocation in a mobile application. He want me to use a map which is quite deformed (definitely not a google-like map). Is it an easy way to transform the GPS coordinates into the coordinates on that deformed map? I get the coordinates (X0,Y0) from the GPS -> I need the location on my client's map (X1,Y1) Dude, you should try http://trimaps.com . It does exactly what you are looking for! You need to know the mapping from the client map to real world co-ordinates. Either ask your client, or perhaps you could overlay it on a google map of the same area in