latitude-longitude

问题 How can i calculate delta-latitude and delta-longitude values form latitude and longitude values for MapView component in React-Native. Thank You 回答1: If you have an array of coordinates and you want a region that will fit all these points, you can do something like this: const regionContainingPoints = points => { let minLat, maxLat, minLng, maxLng; // init first point (point => { minLat = point.latitude; maxLat = point.latitude; minLng = point.longitude; maxLng = point.longitude; })(points[0

问题 I have several data frames in R. The first data frame contains the computed convex hull of a set of lat and long coordinates by market (courtesy of chull in R). It looks like this: MyGeo<- "Part of Chicago & Wisconsin" Longitude <- c(-90.31914, -90.61911, -89.37842, -88.0988, -87.44875) Latitude <- c(38.45781, 38.80097, 43.07961, 43.0624,41.49182) dat <- data.frame(Longitude, Latitude, MyGeo) The second has zip codes by their latitude and longitudinal coordinates (courtesy of the US census

问题 What algorithm/formula can I use to calculate a LatLng point 5 meters closer to another LatLng point? I'm trying to write a function with 2 LatLng parameters and have it return a LatLng that is 5 meters from the first LatLng and in the direction of the second LatLng. 回答1: Have a look at Android Map Utils library, specifically the SphericalUtil class. 1.) Call the method computeHeading to obtain your heading from first to second 2.) Call the method computeOffset to solve for the location 5

问题 I have a location (latitude & longitude). How can I get a list of zipcodes that are either partially or fully within the 10 mile radius of my location? The solution could be a call to a well known web service (google maps, bing maps, etc...) or a local database solution (the client has sql server 2005) or an algorithm. I have seen the somewhat similar question, but all the answers there pretty much pertain to using SQL Server 2008 geography functionality which is unavailable to me. 回答1:

问题 I have a netCDF file that I wish to extract a subset from defined by latitude/longitude boundaries (i.e. a lat/long defined box), using the ‘ncdf’ package in R. A summary of my netCDF file is below. It has two dimensions (latitude and longitude) and 1 variable (10U_GDS4_SFC). It is essentially a lat/long grid containing wind values: [1] "file example.nc has 2 dimensions:" [1] "lat_0 Size: 1280" [1] "lon_1 Size: 2560" [1] "------------------------" [1] "file example.nc has 1 variables:" [1]

问题 I have know my current position({lat:x,lon:y}) and I know my speed and direction angle; How to predict next position at next time? 回答1: First, calculate the distance you will travel based on your current speed and your known time interval ("next time"): distance = speed * time Then you can use this formula to calculate your new position (lat2/lon2): lat2 =asin(sin(lat1)*cos(d)+cos(lat1)*sin(d)*cos(tc)) dlon=atan2(sin(tc)*sin(d)*cos(lat1),cos(d)-sin(lat1)*sin(lat2)) lon2=mod( lon1-dlon +pi,2

问题 I'm setting up a small program to take 2 geographical coordinates from a user and then calculate the distance between them(taking into account the curvature of the earth). So I looked up wikipedia on what the formula is here. I basically set up my python function based on that and this is what I came up with: def geocalc(start_lat, start_long, end_lat, end_long): start_lat = math.radians(start_lat) start_long = math.radians(start_long) end_lat = math.radians(end_long) end_long = math.radians

问题 This question already has answers here : How to get a time zone from a location using latitude and longitude coordinates? (15 answers) Closed 12 months ago . I am trying to get the time zones for latitude and longitude coordinates but am having a few problems The mistakes are probably very basic I have a table in a database with around 600 rows. Each row contains a lat long coordinate for somewhere in the world I want to feed these co-ordinates into a function and then retrieve the time zone.

问题 I'm trying to find a webservice that will allow me to get a County name (not Country) for a specific Lat/Long. I would be performing the lookup within a server application (likely a Java application). It doesn't have a be a webservice if there is some library out there I suppose, but I would like up-to-date information. I have looked around quite a bit for an API that supports this, but so far I haven't been able to find one that works. I have tried the Yahoo APIs like so: http://where

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I have thousands of IP addresses of visitors to my site, what tools can I use to convert these into lat/lng coordinates? I will then be able visualise the data on a map with filters for further demographics gathered. 回答1: For one of my sites I made use of maxmind's free geolite country database which can be