Finding the lat-long of the corners in a Google Maps window

Question

Using the Google Maps API, how can I get the latitude and longitude of the corners of the map display area?

That is, if my map is 300px wide and 400px tall, how can I find the lat-long of the points at (0,0) and (300,400)?

score 14 · Accepted Answer · edited Oct 13 '16 at 23:59

14

Use getBounds(). From the doc:

Returns the the visible rectangular region of the map view in geographical coordinates.

That function returns exactly what you want: the southwest and northeast corners of your map. The first pair of coordinates are the lower left (southwest) coordinates and the second pair is the upper right (northeast) coordinates.

edited Oct 13 '16 at 23:59

Paul Richter

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answered Jul 05 '09 at 05:16

Derek Swingley

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(0,0) is likely intended to be the northwest corner, in which case Matt will need the latitude of the second coordinate, but the longitude from the first. – SingleNegationElimination Jul 05 '09 at 05:36
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Good point, but I figured since we're talking about a map and not a generic screen, the origin would be the lower left, not the upper left. Either way, getBounds() will return the info Matt wants. It's just a matter of parsing it... – Derek Swingley Jul 05 '09 at 05:48
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map.getBounds().getSouthWest().lng() = the west bound. map.getBounds().getNorthEast().lat() = the north bound, etc. – Chris B Jul 06 '09 at 15:41

score 1 · Answer 2 · answered Jan 28 '21 at 10:27

In Android(Kotlin) you can try this,

val curentScreen: LatLngBounds =  mapview.getProjection().getVisibleRegion().latLngBounds

var northeast=curentScreen.northeast
var southwest=curentScreen.southwest
var center=curentScreen.center
Log.v("northeast LatLng","-:"+northeast)
Log.v("southwest LatLng","-:"+southwest)
Log.v("center LatLng","-:"+center)

Finding the lat-long of the corners in a Google Maps window

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