Add 5 kilo meter in latitude value or longitude value

[khaldoon]

Hi,

Is there any way to add 5km distance to latitude, in order to move geographic point to 5 km north or add 5 km to longitude to move 5km east. I want to get the new lat and  lng after adding distance value.

Example:

lat1: 34

lng1: 34

after adding 5km in lat1, new point should be like

new_lat1: 34+5km

new_lng1: 34 (lng1 will remain same as we only added in latitude)

[Jeremy Geerdes]

You can do this using Great Circle algorithms.

Here's how to find distance. You would need to solve the equation for lat2.

distance = ((factor * (lat2-lat1)) ^ 2 + (factor * (lng2 - lng1) * cos(lat2 / 57.3)) ^ 2) ^ .5

Note: factor ~ 69.1 for miles ~ 115.1666667 for km

Jeremy R. Geerdes

Generally Cool Guy

Des Moines, IA

For more information or a project quote:

jrge...@gmail.com

If you're in the Des Moines, IA, area, check out Debra Heights Wesleyan Church!

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[geoco...@gmail.com]

http://www.movable-type.co.uk/scripts/latlong.html

some of that functionality is in the "Geometry" library:
http://code.google.com/apis/maps/documentation/javascript/geometry.html

-- Larry

[Eric Clark]

One important thing is you have to make sure to include the geometry library when you declare your javascript for gmaps

src="http://maps.google.com/maps/api/js?sensor=false&libraries=geometry"

I just did this, my goal was to draw a 1km box around a point. 

ne = google.maps.geometry.spherical.computeOffset(latlng, 500, 0)

latlng is the original latlng object, 500 is the number of meters you want to go, 0 is the number of degrees from North that you want to move in. (0 goes straight up, 90 goes east, 180 south, 270 west)

ne is the resulting latlng 

So to build a square around a point I did:

ne = google.maps.geometry.spherical.computeOffset(latlng, 500, 0) 

ne = google.maps.geometry.spherical.computeOffset(ne, 500, 90)

se = google.maps.geometry.spherical.computeOffset(ne, 1000, 180)

sw = google.maps.geometry.spherical.computeOffset(se, 1000, 270)
nw = google.maps.geometry.spherical.computeOffset(sw, 1000, 0)

var box = new google.maps.Rectangle({

        map:map,

        strokeOpacity:5,

        bounds:new google.maps.LatLngBounds(sw,ne)

        });