Calculate a point on a map given one point and a distance












0















I'm working with google maps on an angular project. I've got a center point of a circle and the length of the radius in meters. I'm trying to find a coordinate of any point on the circumference of a circle - I just need one. How do I calculate this given what I have?



Example data :



Center = {
Latitude : 53.388922117675236
Longitude : -6.280994415283203
}
Radius = 527









share|improve this question




















  • 1





    mathsisfun.com/algebra/circle-equations.html

    – HoangHieu
    Nov 15 '18 at 11:02











  • @NickParsons Sorry, I should have clarified, I just need one point

    – abyrne85
    Nov 15 '18 at 11:03











  • Ok, a point on the circumference should be let x = Center.Latitude+Radius and let y = Center.Longitude If I understand your question correctly :P

    – Nick Parsons
    Nov 15 '18 at 11:06













  • That would mean that the x coordinate is 53.388 + 527 = 605.392. Radius is in meters so I can't add that to a coordinate

    – abyrne85
    Nov 15 '18 at 11:16











  • @abyrne85 a distance and a point will give you the infinite points of a circle. If you want only a point, you should provide another constraint.

    – David Lemon
    Nov 16 '18 at 13:02
















0















I'm working with google maps on an angular project. I've got a center point of a circle and the length of the radius in meters. I'm trying to find a coordinate of any point on the circumference of a circle - I just need one. How do I calculate this given what I have?



Example data :



Center = {
Latitude : 53.388922117675236
Longitude : -6.280994415283203
}
Radius = 527









share|improve this question




















  • 1





    mathsisfun.com/algebra/circle-equations.html

    – HoangHieu
    Nov 15 '18 at 11:02











  • @NickParsons Sorry, I should have clarified, I just need one point

    – abyrne85
    Nov 15 '18 at 11:03











  • Ok, a point on the circumference should be let x = Center.Latitude+Radius and let y = Center.Longitude If I understand your question correctly :P

    – Nick Parsons
    Nov 15 '18 at 11:06













  • That would mean that the x coordinate is 53.388 + 527 = 605.392. Radius is in meters so I can't add that to a coordinate

    – abyrne85
    Nov 15 '18 at 11:16











  • @abyrne85 a distance and a point will give you the infinite points of a circle. If you want only a point, you should provide another constraint.

    – David Lemon
    Nov 16 '18 at 13:02














0












0








0








I'm working with google maps on an angular project. I've got a center point of a circle and the length of the radius in meters. I'm trying to find a coordinate of any point on the circumference of a circle - I just need one. How do I calculate this given what I have?



Example data :



Center = {
Latitude : 53.388922117675236
Longitude : -6.280994415283203
}
Radius = 527









share|improve this question
















I'm working with google maps on an angular project. I've got a center point of a circle and the length of the radius in meters. I'm trying to find a coordinate of any point on the circumference of a circle - I just need one. How do I calculate this given what I have?



Example data :



Center = {
Latitude : 53.388922117675236
Longitude : -6.280994415283203
}
Radius = 527






javascript google-maps math






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 15 '18 at 11:04







abyrne85

















asked Nov 15 '18 at 10:58









abyrne85abyrne85

658520




658520








  • 1





    mathsisfun.com/algebra/circle-equations.html

    – HoangHieu
    Nov 15 '18 at 11:02











  • @NickParsons Sorry, I should have clarified, I just need one point

    – abyrne85
    Nov 15 '18 at 11:03











  • Ok, a point on the circumference should be let x = Center.Latitude+Radius and let y = Center.Longitude If I understand your question correctly :P

    – Nick Parsons
    Nov 15 '18 at 11:06













  • That would mean that the x coordinate is 53.388 + 527 = 605.392. Radius is in meters so I can't add that to a coordinate

    – abyrne85
    Nov 15 '18 at 11:16











  • @abyrne85 a distance and a point will give you the infinite points of a circle. If you want only a point, you should provide another constraint.

    – David Lemon
    Nov 16 '18 at 13:02














  • 1





    mathsisfun.com/algebra/circle-equations.html

    – HoangHieu
    Nov 15 '18 at 11:02











  • @NickParsons Sorry, I should have clarified, I just need one point

    – abyrne85
    Nov 15 '18 at 11:03











  • Ok, a point on the circumference should be let x = Center.Latitude+Radius and let y = Center.Longitude If I understand your question correctly :P

    – Nick Parsons
    Nov 15 '18 at 11:06













  • That would mean that the x coordinate is 53.388 + 527 = 605.392. Radius is in meters so I can't add that to a coordinate

    – abyrne85
    Nov 15 '18 at 11:16











  • @abyrne85 a distance and a point will give you the infinite points of a circle. If you want only a point, you should provide another constraint.

    – David Lemon
    Nov 16 '18 at 13:02








1




1





mathsisfun.com/algebra/circle-equations.html

– HoangHieu
Nov 15 '18 at 11:02





mathsisfun.com/algebra/circle-equations.html

– HoangHieu
Nov 15 '18 at 11:02













@NickParsons Sorry, I should have clarified, I just need one point

– abyrne85
Nov 15 '18 at 11:03





@NickParsons Sorry, I should have clarified, I just need one point

– abyrne85
Nov 15 '18 at 11:03













Ok, a point on the circumference should be let x = Center.Latitude+Radius and let y = Center.Longitude If I understand your question correctly :P

– Nick Parsons
Nov 15 '18 at 11:06







Ok, a point on the circumference should be let x = Center.Latitude+Radius and let y = Center.Longitude If I understand your question correctly :P

– Nick Parsons
Nov 15 '18 at 11:06















That would mean that the x coordinate is 53.388 + 527 = 605.392. Radius is in meters so I can't add that to a coordinate

– abyrne85
Nov 15 '18 at 11:16





That would mean that the x coordinate is 53.388 + 527 = 605.392. Radius is in meters so I can't add that to a coordinate

– abyrne85
Nov 15 '18 at 11:16













@abyrne85 a distance and a point will give you the infinite points of a circle. If you want only a point, you should provide another constraint.

– David Lemon
Nov 16 '18 at 13:02





@abyrne85 a distance and a point will give you the infinite points of a circle. If you want only a point, you should provide another constraint.

– David Lemon
Nov 16 '18 at 13:02












2 Answers
2






active

oldest

votes


















1














The Maps API has a geometry library that you can use to calculate distances, heading, etc.



So if you need to find 1 point at a given distance from another point, whatever heading, you can use the computeOffset method.



What the following code does, it adds a marker at position 0,0 (var myLatLng) then adds another marker, 5000 meters from that point, at a heading of 0 (North). You can change the heading of course if you need to.






function initialize() {

var myLatLng = new google.maps.LatLng(0,0);
var mapOptions = {
zoom: 10,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};

var point = google.maps.geometry.spherical.computeOffset(myLatLng, 5000, 0);

var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);

new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Origin marker'
});

new google.maps.Marker({
position: point,
map: map,
title: 'Offset marker'
});
}

initialize();

#map-canvas {
height: 200px;
}

<div id="map-canvas"></div>

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>






Note how the API is loaded, with including the geometry library.







share|improve this answer



















  • 1





    I'm already using the geometry library so this is perfect. Thanks

    – abyrne85
    Nov 15 '18 at 11:54



















2














If you need arbitrary point at given distance, the simplest way is to choose meridional direction



NewLong = Long
NewLat = Lat +- Radius / 111111.111 (meters per degree)


Or parallel direction:



NewLat = Lat
NewLong = Long +- Radius / 111111.111 / Cos(Lat)


For random direction generate random bearing and use formula from this page



Formula:
φ2 = asin( sin φ1 ⋅ cos δ + cos φ1 ⋅ sin δ ⋅ cos θ )
λ2 = λ1 + atan2( sin θ ⋅ sin δ ⋅ cos φ1, cos δ − sin φ1 ⋅ sin φ2 )
where φ is latitude, λ is longitude,
θ is the bearing (clockwise from north),
δ is the angular distance d/R;
d being the distance travelled, R the earth’s radius

JavaScript:(all angles in radians)
var φ2 = Math.asin( Math.sin(φ1)*Math.cos(d/R) +
Math.cos(φ1)*Math.sin(d/R)*Math.cos(brng) );
var λ2 = λ1 + Math.atan2(Math.sin(brng)*Math.sin(d/R)*Math.cos(φ1),
Math.cos(d/R)-Math.sin(φ1)*Math.sin(φ2));





share|improve this answer


























  • This is certainly the right maths. But 1) you didn't provide a Javascript version and 2) you don't need to compute that manually as the API has a method for that (see my answer).

    – MrUpsidown
    Nov 15 '18 at 11:45






  • 1





    @MrUpsidown I did not believe that JS guys cannot write given formulas in JS ;)

    – MBo
    Nov 15 '18 at 11:48













  • Easy ;) But when the question mentions JS, I try to provide JS. Obviously not a big deal! Thanks for updating!

    – MrUpsidown
    Nov 15 '18 at 11:52











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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









1














The Maps API has a geometry library that you can use to calculate distances, heading, etc.



So if you need to find 1 point at a given distance from another point, whatever heading, you can use the computeOffset method.



What the following code does, it adds a marker at position 0,0 (var myLatLng) then adds another marker, 5000 meters from that point, at a heading of 0 (North). You can change the heading of course if you need to.






function initialize() {

var myLatLng = new google.maps.LatLng(0,0);
var mapOptions = {
zoom: 10,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};

var point = google.maps.geometry.spherical.computeOffset(myLatLng, 5000, 0);

var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);

new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Origin marker'
});

new google.maps.Marker({
position: point,
map: map,
title: 'Offset marker'
});
}

initialize();

#map-canvas {
height: 200px;
}

<div id="map-canvas"></div>

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>






Note how the API is loaded, with including the geometry library.







share|improve this answer



















  • 1





    I'm already using the geometry library so this is perfect. Thanks

    – abyrne85
    Nov 15 '18 at 11:54
















1














The Maps API has a geometry library that you can use to calculate distances, heading, etc.



So if you need to find 1 point at a given distance from another point, whatever heading, you can use the computeOffset method.



What the following code does, it adds a marker at position 0,0 (var myLatLng) then adds another marker, 5000 meters from that point, at a heading of 0 (North). You can change the heading of course if you need to.






function initialize() {

var myLatLng = new google.maps.LatLng(0,0);
var mapOptions = {
zoom: 10,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};

var point = google.maps.geometry.spherical.computeOffset(myLatLng, 5000, 0);

var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);

new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Origin marker'
});

new google.maps.Marker({
position: point,
map: map,
title: 'Offset marker'
});
}

initialize();

#map-canvas {
height: 200px;
}

<div id="map-canvas"></div>

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>






Note how the API is loaded, with including the geometry library.







share|improve this answer



















  • 1





    I'm already using the geometry library so this is perfect. Thanks

    – abyrne85
    Nov 15 '18 at 11:54














1












1








1







The Maps API has a geometry library that you can use to calculate distances, heading, etc.



So if you need to find 1 point at a given distance from another point, whatever heading, you can use the computeOffset method.



What the following code does, it adds a marker at position 0,0 (var myLatLng) then adds another marker, 5000 meters from that point, at a heading of 0 (North). You can change the heading of course if you need to.






function initialize() {

var myLatLng = new google.maps.LatLng(0,0);
var mapOptions = {
zoom: 10,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};

var point = google.maps.geometry.spherical.computeOffset(myLatLng, 5000, 0);

var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);

new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Origin marker'
});

new google.maps.Marker({
position: point,
map: map,
title: 'Offset marker'
});
}

initialize();

#map-canvas {
height: 200px;
}

<div id="map-canvas"></div>

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>






Note how the API is loaded, with including the geometry library.







share|improve this answer













The Maps API has a geometry library that you can use to calculate distances, heading, etc.



So if you need to find 1 point at a given distance from another point, whatever heading, you can use the computeOffset method.



What the following code does, it adds a marker at position 0,0 (var myLatLng) then adds another marker, 5000 meters from that point, at a heading of 0 (North). You can change the heading of course if you need to.






function initialize() {

var myLatLng = new google.maps.LatLng(0,0);
var mapOptions = {
zoom: 10,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};

var point = google.maps.geometry.spherical.computeOffset(myLatLng, 5000, 0);

var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);

new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Origin marker'
});

new google.maps.Marker({
position: point,
map: map,
title: 'Offset marker'
});
}

initialize();

#map-canvas {
height: 200px;
}

<div id="map-canvas"></div>

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>






Note how the API is loaded, with including the geometry library.







function initialize() {

var myLatLng = new google.maps.LatLng(0,0);
var mapOptions = {
zoom: 10,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};

var point = google.maps.geometry.spherical.computeOffset(myLatLng, 5000, 0);

var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);

new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Origin marker'
});

new google.maps.Marker({
position: point,
map: map,
title: 'Offset marker'
});
}

initialize();

#map-canvas {
height: 200px;
}

<div id="map-canvas"></div>

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>





function initialize() {

var myLatLng = new google.maps.LatLng(0,0);
var mapOptions = {
zoom: 10,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};

var point = google.maps.geometry.spherical.computeOffset(myLatLng, 5000, 0);

var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);

new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Origin marker'
});

new google.maps.Marker({
position: point,
map: map,
title: 'Offset marker'
});
}

initialize();

#map-canvas {
height: 200px;
}

<div id="map-canvas"></div>

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>






share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 15 '18 at 11:30









MrUpsidownMrUpsidown

15.2k84995




15.2k84995








  • 1





    I'm already using the geometry library so this is perfect. Thanks

    – abyrne85
    Nov 15 '18 at 11:54














  • 1





    I'm already using the geometry library so this is perfect. Thanks

    – abyrne85
    Nov 15 '18 at 11:54








1




1





I'm already using the geometry library so this is perfect. Thanks

– abyrne85
Nov 15 '18 at 11:54





I'm already using the geometry library so this is perfect. Thanks

– abyrne85
Nov 15 '18 at 11:54













2














If you need arbitrary point at given distance, the simplest way is to choose meridional direction



NewLong = Long
NewLat = Lat +- Radius / 111111.111 (meters per degree)


Or parallel direction:



NewLat = Lat
NewLong = Long +- Radius / 111111.111 / Cos(Lat)


For random direction generate random bearing and use formula from this page



Formula:
φ2 = asin( sin φ1 ⋅ cos δ + cos φ1 ⋅ sin δ ⋅ cos θ )
λ2 = λ1 + atan2( sin θ ⋅ sin δ ⋅ cos φ1, cos δ − sin φ1 ⋅ sin φ2 )
where φ is latitude, λ is longitude,
θ is the bearing (clockwise from north),
δ is the angular distance d/R;
d being the distance travelled, R the earth’s radius

JavaScript:(all angles in radians)
var φ2 = Math.asin( Math.sin(φ1)*Math.cos(d/R) +
Math.cos(φ1)*Math.sin(d/R)*Math.cos(brng) );
var λ2 = λ1 + Math.atan2(Math.sin(brng)*Math.sin(d/R)*Math.cos(φ1),
Math.cos(d/R)-Math.sin(φ1)*Math.sin(φ2));





share|improve this answer


























  • This is certainly the right maths. But 1) you didn't provide a Javascript version and 2) you don't need to compute that manually as the API has a method for that (see my answer).

    – MrUpsidown
    Nov 15 '18 at 11:45






  • 1





    @MrUpsidown I did not believe that JS guys cannot write given formulas in JS ;)

    – MBo
    Nov 15 '18 at 11:48













  • Easy ;) But when the question mentions JS, I try to provide JS. Obviously not a big deal! Thanks for updating!

    – MrUpsidown
    Nov 15 '18 at 11:52
















2














If you need arbitrary point at given distance, the simplest way is to choose meridional direction



NewLong = Long
NewLat = Lat +- Radius / 111111.111 (meters per degree)


Or parallel direction:



NewLat = Lat
NewLong = Long +- Radius / 111111.111 / Cos(Lat)


For random direction generate random bearing and use formula from this page



Formula:
φ2 = asin( sin φ1 ⋅ cos δ + cos φ1 ⋅ sin δ ⋅ cos θ )
λ2 = λ1 + atan2( sin θ ⋅ sin δ ⋅ cos φ1, cos δ − sin φ1 ⋅ sin φ2 )
where φ is latitude, λ is longitude,
θ is the bearing (clockwise from north),
δ is the angular distance d/R;
d being the distance travelled, R the earth’s radius

JavaScript:(all angles in radians)
var φ2 = Math.asin( Math.sin(φ1)*Math.cos(d/R) +
Math.cos(φ1)*Math.sin(d/R)*Math.cos(brng) );
var λ2 = λ1 + Math.atan2(Math.sin(brng)*Math.sin(d/R)*Math.cos(φ1),
Math.cos(d/R)-Math.sin(φ1)*Math.sin(φ2));





share|improve this answer


























  • This is certainly the right maths. But 1) you didn't provide a Javascript version and 2) you don't need to compute that manually as the API has a method for that (see my answer).

    – MrUpsidown
    Nov 15 '18 at 11:45






  • 1





    @MrUpsidown I did not believe that JS guys cannot write given formulas in JS ;)

    – MBo
    Nov 15 '18 at 11:48













  • Easy ;) But when the question mentions JS, I try to provide JS. Obviously not a big deal! Thanks for updating!

    – MrUpsidown
    Nov 15 '18 at 11:52














2












2








2







If you need arbitrary point at given distance, the simplest way is to choose meridional direction



NewLong = Long
NewLat = Lat +- Radius / 111111.111 (meters per degree)


Or parallel direction:



NewLat = Lat
NewLong = Long +- Radius / 111111.111 / Cos(Lat)


For random direction generate random bearing and use formula from this page



Formula:
φ2 = asin( sin φ1 ⋅ cos δ + cos φ1 ⋅ sin δ ⋅ cos θ )
λ2 = λ1 + atan2( sin θ ⋅ sin δ ⋅ cos φ1, cos δ − sin φ1 ⋅ sin φ2 )
where φ is latitude, λ is longitude,
θ is the bearing (clockwise from north),
δ is the angular distance d/R;
d being the distance travelled, R the earth’s radius

JavaScript:(all angles in radians)
var φ2 = Math.asin( Math.sin(φ1)*Math.cos(d/R) +
Math.cos(φ1)*Math.sin(d/R)*Math.cos(brng) );
var λ2 = λ1 + Math.atan2(Math.sin(brng)*Math.sin(d/R)*Math.cos(φ1),
Math.cos(d/R)-Math.sin(φ1)*Math.sin(φ2));





share|improve this answer















If you need arbitrary point at given distance, the simplest way is to choose meridional direction



NewLong = Long
NewLat = Lat +- Radius / 111111.111 (meters per degree)


Or parallel direction:



NewLat = Lat
NewLong = Long +- Radius / 111111.111 / Cos(Lat)


For random direction generate random bearing and use formula from this page



Formula:
φ2 = asin( sin φ1 ⋅ cos δ + cos φ1 ⋅ sin δ ⋅ cos θ )
λ2 = λ1 + atan2( sin θ ⋅ sin δ ⋅ cos φ1, cos δ − sin φ1 ⋅ sin φ2 )
where φ is latitude, λ is longitude,
θ is the bearing (clockwise from north),
δ is the angular distance d/R;
d being the distance travelled, R the earth’s radius

JavaScript:(all angles in radians)
var φ2 = Math.asin( Math.sin(φ1)*Math.cos(d/R) +
Math.cos(φ1)*Math.sin(d/R)*Math.cos(brng) );
var λ2 = λ1 + Math.atan2(Math.sin(brng)*Math.sin(d/R)*Math.cos(φ1),
Math.cos(d/R)-Math.sin(φ1)*Math.sin(φ2));






share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 15 '18 at 11:46

























answered Nov 15 '18 at 11:17









MBoMBo

49.2k23051




49.2k23051













  • This is certainly the right maths. But 1) you didn't provide a Javascript version and 2) you don't need to compute that manually as the API has a method for that (see my answer).

    – MrUpsidown
    Nov 15 '18 at 11:45






  • 1





    @MrUpsidown I did not believe that JS guys cannot write given formulas in JS ;)

    – MBo
    Nov 15 '18 at 11:48













  • Easy ;) But when the question mentions JS, I try to provide JS. Obviously not a big deal! Thanks for updating!

    – MrUpsidown
    Nov 15 '18 at 11:52



















  • This is certainly the right maths. But 1) you didn't provide a Javascript version and 2) you don't need to compute that manually as the API has a method for that (see my answer).

    – MrUpsidown
    Nov 15 '18 at 11:45






  • 1





    @MrUpsidown I did not believe that JS guys cannot write given formulas in JS ;)

    – MBo
    Nov 15 '18 at 11:48













  • Easy ;) But when the question mentions JS, I try to provide JS. Obviously not a big deal! Thanks for updating!

    – MrUpsidown
    Nov 15 '18 at 11:52

















This is certainly the right maths. But 1) you didn't provide a Javascript version and 2) you don't need to compute that manually as the API has a method for that (see my answer).

– MrUpsidown
Nov 15 '18 at 11:45





This is certainly the right maths. But 1) you didn't provide a Javascript version and 2) you don't need to compute that manually as the API has a method for that (see my answer).

– MrUpsidown
Nov 15 '18 at 11:45




1




1





@MrUpsidown I did not believe that JS guys cannot write given formulas in JS ;)

– MBo
Nov 15 '18 at 11:48







@MrUpsidown I did not believe that JS guys cannot write given formulas in JS ;)

– MBo
Nov 15 '18 at 11:48















Easy ;) But when the question mentions JS, I try to provide JS. Obviously not a big deal! Thanks for updating!

– MrUpsidown
Nov 15 '18 at 11:52





Easy ;) But when the question mentions JS, I try to provide JS. Obviously not a big deal! Thanks for updating!

– MrUpsidown
Nov 15 '18 at 11:52


















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