Google’s Geocoder returns wrong country, ignoring the region hint
Use componentRestrictions attribute: geocoder.geocode({‘address’: request.term, componentRestrictions: {country: ‘GB’}}
geolocation
Python module for getting latitude and longitude from the name of a US city
Have a look at geopy. In the “getting started” documentation it shows: >>> from geopy import geocoders >>> gn = geocoders.GeoNames() >>> print gn.geocode(“Cleveland, OH 44106”) (u’Cleveland, OH, US’, (41.4994954, -81.6954088)) >>> gn.geocode(“Cleveland, OH”, exactly_one=False)[0] (u’Cleveland, OH, US’, (41.4994954, -81.6954088))
Calculate new coordinate x meters and y degree away from one coordinate
Unfortunately, there’s no such function provided in the API, so you’ll have to write your own. This site gives several calculations involving latitude/longitude and sample JavaScript code. Specifically, the section titled “Destination point given distance and bearing from start point” shows how to calculate what you’re asking. The JavaScript code is at the bottom of … Read more
How do some web services recognize I’m logging in from a new location?
Here are some ideas you may be interested in… As I already said to you it’s not an exact science. You should keep what’s important for security first and consider all this “optional” Plus, remember that all suggested “time durations” are subjective depending on how frenetic are accessess to your site and how strong should … Read more
How to properly triangulate GSM cell towers to get a location?
I can help you with a bit of the theory. Triangulation is basically finding the intersection point of 3 circles. Each mobile tower is the center of a circle. The size of the circle is relative to the signal strength of that tower. The place where the 3 circles overlap is where the user is. … Read more
Wait until a condition is true?
Modern solution using Promise function waitFor(conditionFunction) { const poll = resolve => { if(conditionFunction()) resolve(); else setTimeout(_ => poll(resolve), 400); } return new Promise(poll); } Usage waitFor(_ => flag === true) .then(_ => console.log(‘the wait is over!’)); or async function demo() { await waitFor(_ => flag === true); console.log(‘the wait is over!’); } References Promises … Read more
Longitude and latitude value from IP address
MaxMind Geolite city is free. If it is not good enough, you can apparently upgrade to a more accurate paid-version. I can’t speak for the quality of the paid version, as I have never used it. If you like your SQL, download the CSV version. Load it into your database of choice, and query away. … Read more
Detecting whether a GPS coordinate falls within a polygon on a map
Here is a java program which uses a function that will return true if a latitude/longitude is found inside of a polygon defined by a list of lat/longs, with demonstration for the state of florida. I’m not sure if it deals with the fact that the lat/long GPS system is not an x/y coordinate plane. … Read more