12,278 questions
3
votes
3
answers
1k
views
Where is the best place to download accurate lat/long/alt data? [closed]
I'm sure this is publicly available somewhere but my google-fu has failed me. What I'd like to do is download the most accurate lat/long/alt data available for the world. This can exclude oceanic ...
- 5,731
1
vote
3
answers
1k
views
How can i determine if location information returned by CLLocationManager is valid?
How can I determine if location information returned by CLLocationManager is valid?
- 20.6k
1
vote
2
answers
241
views
Is there an API that I can use to duplicate the "Places" functionality of iPhoto '09?
I saw the Apple keynote address and was very impressed by the new Places functionality that's been added to iPhoto '09. In short, it takes the geocode information from a photo and translates it into a ...
- 21.6k
1
vote
2
answers
738
views
Location API not working for custom/third-party applications
I'm trying to write a simple GPS based application for my BB 8800 (with Airtel, India).
But for some reason my code getLocation(timeout) always returns with a non-valid location (only after timing ...
- 41
2
votes
3
answers
2k
views
The Google Maps Wikipedia Layer
Is there a way to programmatically list all geo-tagged Wikipedia entries within a radius of a long/lat point? I'm thinking this is possible with the google maps API but I am interested in any method. ...
- 5,109
209
votes
19
answers
515k
views
Getting the location from an IP address [closed]
I want to retrieve information like the city, state, and country of a visitor from their IP address, so that I can customize my web page according to their location. Is there a good and reliable way ...
krishna Kant
14
votes
5
answers
23k
views
Geospatial coordinates and distance in kilometers
This is a followup to this question.
I seem to be stuck on this. Basically, I need to be able to convert back and forth to referring to coordinates either in the standard degree system OR by ...
- 7,217
8
votes
3
answers
3k
views
Calculate longitude/latitude
Given the following input:
known longitudes/latitudes of 1..n locations
known distance between locations 1..n and another location "m"
How can I calculate the longitude/latitude of the location "m"?
filibuster
447
votes
32
answers
559k
views
Calculate distance between 2 GPS coordinates
How do I calculate distance between two GPS coordinates (using latitude and longitude)?
- 7,279
2
votes
2
answers
780
views
Deliver multicast to several different geo-locations
I need to use one logical PGM based multicast address in application while enable such application "seamlessly" running across several different geo-locations (i.e. think US/Europe/Australia).
...
- 105
6
votes
6
answers
18k
views
Determine the centroid of multiple points
I'm writing a mapping application that I am writing in python and I need to get the lat/lon centroid of N points.
Say I have two locations
a.lat = 101
a.lon = 230
b.lat = 146
b.lon = 200
Getting the ...
- 2,669
10
votes
5
answers
5k
views
Where can I get databases of cities/places around the world?
In dopplr [http://www.dopplr.com] there is an option to fill the city of travel and the site will automatically find the city around the world. Is there any web service or database for such a city ...
- 11k
7
votes
6
answers
8k
views
Is there a way to get the users location without having the user install Google Gears?
I don't want to have the user install Google Gears so I can show him his guessed location. Is there a way to get the location without having to use Google Gears?
I have found http://www.wipmania.com/...
- 18.2k
35
votes
6
answers
61k
views
Where can I get postal codes for all countries?
I once read about an open source database for postal codes with geolocation data but now I can't remember its name. Can someone help?
- 11k
7
votes
6
answers
5k
views
Most efficient way for storing geolocations in a database
I know postgres has a datatype for storing geographical coordinates. But I'm looking for a RDBMS-agnostic solution. Currently I'm using Decimal(25,20) in MySQL. I may be using this data to lookup ...
- 38.5k
7
votes
1
answer
3k
views
How to plot Polyline Area, i.e. service coverage area, and also check to see if visitor's address lies within that area using Google Maps API and PHP?
I am the owner of a business that is building a new website application. My partner is the programmer who is doing the development and neither one of us has any real in-depth experience with Google ...
Larry D
4
votes
6
answers
8k
views
Is there a formula to convert from Thomas Bros Map page & grid to a latitude/longitude?
I'm working on a project that contains Thomas Brothers Map page and grid numbers. Is there a way to programatically convert from this map page to a latitude & longitude?
An Example would be for ...
- 709
3
votes
5
answers
4k
views
Redirect depending on the Country?
We basically have 2 sites ( Java /JSP / Apache Webserver) :
something.ca & something.com
The .ca is canadian content, and the .com is american content.
We need users to be redirected based on ...
- 5,797
0
votes
1
answer
1k
views
How do I use a state specific proxy?
I need to hit a website through a state specific IP Address. Any suggestions on how to do this?
asdf
2
votes
3
answers
322
views
Simple Geographic Data Sources for a Web App
For a web app I'm working on, I need to know the lat/lon of about 300 US cities. I also need to know the lat/lon for every US zip code.
Does anyone know of a free source to get this information?
- 47.5k
40
votes
9
answers
56k
views
Geolocation API on the iPhone
Does anyone know whether the iPhone supports or will soon support the W3C Geolocation specification?
I'm looking to build an app for mobile users, but rather than spend the time developing apps for ...
- 44.1k
4
votes
6
answers
6k
views
Testing IP based geolocation [closed]
We are implementing an IP based geolocation service, and we need to find some IP's from various markets (LA, NY etc) to fully test the service.
Does anybody know of a directory where we could find ...
- 176k
1
vote
3
answers
1k
views
Are there any better geolocation databases / technologies / services or has anyone done any work with improving the accuracy of existing systems?
I am working on integrating geolocation services into a website and the best source of data I've found so far is MaxMind's GeoIP API with GeoLite City data. Even this data seems to often be ...
- 15.4k
29
votes
5
answers
71k
views
Java, convert lat/lon to UTM [closed]
Does anyone know of a way, in Java, to convert an earth surface position from lat, lon to UTM (say in WGS84)? I'm currently looking at Geotools but unfortunately the solution is not obvious.
- 63.3k
11
votes
6
answers
19k
views
How do I limit which countries can view my website ( PHP )
In there an easy way to do this in PHP. I want to make sure that only web requests from certain countries are able to access my website.
Any ideas?
- 55.2k
76
votes
12
answers
99k
views
How to obtain longitude and latitude for a street address programmatically (and legally) [closed]
Supposedly, it is possible to get this from Google Maps or some such service. (US addresses only is not good enough.)
- 5,986
12
votes
8
answers
11k
views
What pre-existing services exist for calculating distance between two addresses?
I'd like to implement a way to display a list of stored addresses sorted by proximity to a given address.
Addresses in the list will be stored in a database table. Separate parts have separate ...
- 5,757
1
vote
5
answers
2k
views
What's a good way to store raster data?
I have a variety of time-series data stored on a more-or-less georeferenced grid, e.g. one value per 0.2 degrees of latitude and longitude. Currently the data are stored in text files, so at day-of-...
Rick Wayne