I am interested in plotting random points within X miles of a user's location.
Is there a function/algorithm for finding a coordinate X miles (or meters) away from a given coordinate?
You get coordinate of any map point with respect to the current location or any location of your choosing. [ https://stackoverflow.com/a/20241963/1336105 ]
Plot it on the map.
Related
I am writing a java program to generate a calculated distance from a mathematical formula. I want to add this value to a location coordinate value obtained from google maps in order to get the new location coordinate.How can i add the distance to geo-location in my program?
to do the conversions between geoloaction coordinates and distances in meters, nautical mile conversions has to be taken to consideration.This is possible in a manual calculation. but projection system or the coordinate s system of the maps used should be known.
Given latitude and longitude of a location say 27.1231 and 72.3454 how do I randomly plot points within a circle of radius say 10km with the above lat and log as the center?
It's somewhat similar to this (?)
EDIT
It's a geocoder question and not a Gmaps4rails one
How to get the co-ordinates of random points within a given range?
you may use google.maps.geometry.spherical.computeOffset with random distance and heading
I want to ask this question without thinking about a specific technology. Suppose I pull a map tile from any maps provider using my real world location. How can I mark my location on this map tile? What is the calculation used here to convert longitude and latitude to pixels?
I have worked on OpenGL methods to view data on the earth and I think I'd summarize the position process as follows. This is by no mean the only way to do it by hopefully it helps you to think about the problem.
Treat the earth's core as the origin of a sphere, convert all polar coordinate of (latitude, longitude, radius) into (x,y,z) for every map points. Same thing for a particular mark you are interested in.
At this point, you would need to pick a view origin. Say this is your location.
Rotate everything by view origin's negative longitude through z-axis.
Rotate everything by view origin's negative latitude through y-axis.
At this point, the cartesian coordinate of all the points should have view location as the origin. Essentially, you are looking downward to the view origin.
Finally, scale it down and translate so that (x,y) fits in your coordinate system.
How can I find out the size of the currently displayed area of MKMapKit view, ideally in meters?
MKMapKit has a visibleMapRect method which can be used to obtain a MKMapSize, for which the docs say:
The units of this value are map points.
What is a "map point"?
This might help:
iphone -- convert MKMapPoint distances to meters
I have a series of lat/lon which represents the center of some object. I need to draw a line through this point that is x meters on either side of the center and it needs to be perpendicular to the heading (imagine a capital T)
Ultimately I want to get the lat/lon of this line's endpoints.
Thanks!
The basic calculation is in this similar question's answer: Calculate second point knowing the starting point and distance. Calculate the points for the two headings perpendicular to the main heading the distance away you want.
Have a look at: Core Location extensions for bearing and distance
With those extensions and two points on the initial line you should be able to get the bearing, add/subtract pi/2 and find points to either side like this:
double bearing = [bottomOfT bearingInRadiansTowardsLocation:topOfT];
CLLocation *left = [topOfT newLocationAtDistance:meters
alongBearingradians:bearing+M_PI/2];
CLLocation *right = [topOfT newLocationAtDistance:meters
alongBearingradians:bearing-M_PI/2];