I have heading that i get with this computeHeading(from:LatLng, to:LatLng), latlng of one point and distance to second point(in meters) is there a way using these three things to get latlng of second point ?
From google docs Navigation Functions
Given a particular heading, an origin location, and the distance to travel (in meters), you can calculate the destination coordinates using computeOffset().
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I'm just playing around with Here and this is my escenario for an idea.
Get a routing between 2 points, I know this is doable
Set the start and finish marker, I know this is doable
Get the distance between the 2 points, I know this is doable
Now, if the distance from point 1 and 2 is 3000 meters I want to set a marker ( You are here ) based on a arbitrary distance value, let say I want to add a marker at the 1750 meters point, the market should appears in the half route way.
Is this posible with the actual API?
Thanks in advance!
Yes it is possible to do with HERE javascript API.
Once you get routing response and create H.geo.LineString out of it, you can calculate distance between each two geo points from that line string using H.geo.Point#distance method. This will help to determine between which two points (lat, lng) is your desired arbitrary distance.
After that you need to calculate angle between these two geo points and use it in method H.geo.Point#walk in order to get exact position of the geo point you need.
Here you can find jsfiddle example which places marker on the simple LineString based on desired arbitrary distance.
I am running a taxicab distance function on a list of coordinates and I would like to convert the outcome integer to a mile or km quantity. For example:
0.0117420 = |40.721319 - 40.712278| + |-73.844311 - -73.841610|
Where 0.0117420 is the output I would like to convert to mi/km. How could I go about this?
This appears to be a situation where you are trying to navigate from (40.721319, -73.844311) to (40.712278, -73.841610) where these are lat / lon pairs, and you want to navigate using a "Manhattan" routing rather than a direct great circle route.
It looks like you are considering these points as opposite corners of a "rectangle" where travel is only allowed along north, south, east and west headings to move from one point to another and where travel along the path always brings the traveler closer to the destination point.
An approximation of this is to find one of the corners of the bounding rectangle for all such paths. There are two of them, one at (40.721319, -73.841610) and the other at (40.712278, -73.844311). So, you can pick one of these and chose that as a waypoint for approximating the length each possible "Manhattan routes" between the two points. If we chose the first, you will need to calculate the distance from the starting point to the waypoint then to the destination point. Such as:
l(0) = (40.721319, -73.844311)
l(1) = (40.721319, -73.841610)
l(2) = (40.712278, -73.841610)
Using the Haversine equations we see the distance from l(0) to l(1) is approximately 0.2276km and the distance from l(1) to l(2) is approximately 1.005km making the entire route about 1.2326km.
This is approximately the length of any "Manhattan route" you pick where the distance is strictly decreasing along the path taken between the two points. There are also some errors due to the curvature of the Earth, but for points this close to each other and so distant from either of the poles, this should be good enough for most applications.
I have set of lat/long which are stored in database and I have to find all the lat/long from the database which are lies between the given lat/long(e.glatitude = 37.4224764,and longitude=-122.0842499) and given radius(say 5miles).For this I need to do some addition and subtraction like:
37.4224764 + 5mile
37.4224764 - 5mile
and
-122.0842499+5mile
-122.0842499-5mile
But I don't know how the conversion works here.
You're a little vague in your requirements, do you just want to find out the coordinates of a point a certain distance from your current location in a given direction? Or get a circle of a radius of a particular distance around your coordinates? Or draw a line of a certain length from your coordinates to another point a particular distance away?
I assume you'd probabaly want to use the Geometry spherical library, e.g.
var latLng = new google.maps.LatLng(geometry.location.lat, geometry.location.lng);
var newLatLng = google.maps.geometry.spherical.computeOffset(
latLng,
1000,
0
);
see also https://developers.google.com/maps/documentation/javascript/geometry#Distance
PS: you need to add the geometry library parameter when loading the map:
<script src="https://maps.googleapis.com/maps/api/js?v=3&libraries=geometry"></script>
App works this way:
User enters a starting location and a distance. User can choose to draw circles, or lines over the roads. Circles work fine. Lines used to work.
When Lines, the code finds the lat/long of the starting location, then for the points N, S, E, W of the origin at the distance set by the user (say, 100km). Starting with the N destination, the code calls google.maps.DirectionsService() to get directions from the origin to N. This returns an array of lat/longs in the the route.overview_path.
NOTE: I COULD use the directionsRenderer() to draw the route, BUT, the distance drawn would be greater than the distance set by the user. Drawing the entire route from the origin to the point N might be 124km over the roads, and I just want to draw 100km.
Instead, I step through the route.overview_path[] array, checking the distance between that point and the point of origin, adding each point to a new array. When the distance is greater than the dist set by the user, I stop, pop off the last element, then create a new Polyline based on this 2nd, smaller array.
I've spent the entire day in Chrome's developer mode walking through the javascript, setting breakpoints, watching locals, etc. The array of points passed in google.maps.Polyline({}) is a good array of unique points. I just cannot figure out why they aren't rendering.
Ultimately, the code used to draw 4 lines starting at the point of origin, one heading North, one heading East, South, West. etc....
The code is here: http://whosquick.com/RunViz.html
Thank you for your attention.
Nevermind. Solved it.
var objGeo = new LatLon(Geo.parseDMS(myroute.overview_path[0].Pa), Geo.parseDMS(myroute.overview_path[0].Qa));
I had inadvertently switched Pa with Qa.
I loop along an MVCArray ... trying to split the segments by an offset.
But I would require a little more precision to split the poly-line at the proper points.
Basically I just would need to know how to calculate a point on a line between 2 points - defined by the last few meters.
Or is there any way to insert a verticle at this position?
Talking of Maps API V3.