geolocation

问题 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

问题 Does anyone have experience using cordova, html and know how to fix this geolocation message issue for iOS? I just want the message to say the app name followed by the line, "would like to use your current location." Current Geolocation Message: ///Users/kklsndksjladn/Library/Developer/CoreSimulator/Devices/FAF7EE4C-40BA-430A-80D5-5C84B07D970D/data/Containers/Bundle/Application/DAE305B6-C6DD-438B-B4D7-9B183A8B2D97/HelpME.app/www/index.html I've tried various solutions from stack overflow and

问题 Why do calls to the Google Maps Geocoder API return different results than what I see in my browser? This one returns many items : http://maps.google.fr/maps?q=McDonald,+paris This one returns a ZERO_RESULT : http://maps.googleapis.com/maps/api/geocode/xml?McDonald,+paris&sensor=false 回答1: FAQ: https://developers.google.com/maps/faq#geocoder_differences The API geocoder finds postal addresses . The Maps geocoder uses lots of data, including business data, to find results. There is the Places

问题 I have a number of longitude and latitude coordinates that make up a polygonal zone. I also have a longitude and latitude coordinate to define the position of a vehicle. How do I check that the vehicle is located within the polygonal zone? 回答1: This is essentially the Point in polygon problem on a sphere. You can modify the ray casting algorithm so that it uses arcs of great circles instead of line segments. for each pair of adjacent coordinates that make up your polygon, draw a great circle

问题 I have a number of longitude and latitude coordinates that make up a polygonal zone. I also have a longitude and latitude coordinate to define the position of a vehicle. How do I check that the vehicle is located within the polygonal zone? 回答1: This is essentially the Point in polygon problem on a sphere. You can modify the ray casting algorithm so that it uses arcs of great circles instead of line segments. for each pair of adjacent coordinates that make up your polygon, draw a great circle

问题 I have a number of longitude and latitude coordinates that make up a polygonal zone. I also have a longitude and latitude coordinate to define the position of a vehicle. How do I check that the vehicle is located within the polygonal zone? 回答1: This is essentially the Point in polygon problem on a sphere. You can modify the ray casting algorithm so that it uses arcs of great circles instead of line segments. for each pair of adjacent coordinates that make up your polygon, draw a great circle

问题 I'm having a weird error while using the emulator ONLY. I found one question that has the same issue 9 months ago with no answers at all... I'm using google play services locations to get locations in my app and I'm sure of my manifest permissions and everything works perfectly on my phone, the problem occurs when using an emulator only, and I tried different emulators on both my iMac and Windows machines. I doubt that emulators don't support this basic function! here is my manifest code: <

问题 i am using http://api.easyjquery.com/ips/?ip=115.119.253.90&full=true this api for getting current location but when this site goes down i am not able to get current location. can google provide any api to find current location using ip. 回答1: If you don't want to use the HTML5 Geolocoation API, you can detect a bit from IP. Or try other other solution The Google Geocoding API Geolocator-PHP Maxmind http://www.maxmind.com/app/php ipinfodb 来源： https://stackoverflow.com/questions/10562265/i-want

问题 Is there a way to figure out the country name just by looking at an IP address? I mean, do countries have specific ranges of IP addresses? For example, Australia can have IP addresses only in the range of 123.45.56.89 - 231.54.65.98 (just an example) 回答1: I think what you're looking for is an IP Geolocation database or service provider. There are many out there and some are free (get what you pay for). Although I haven't used this service before, it claims to be in real-time. https://kickfire

问题 Given a database of places with Latitude + Longitude locations, such as 40.8120390, -73.4889650, how would I find all locations within a given distance of a specific location? It doesn't seem very efficient to select all locations from the DB and then go through them one by one, getting the distance from the starting location to see if they are within the specified distance. Is there a good way to narrow down the initially selected locations from the DB? Once I have (or don't?) a narrowed