Comments on: Bounding Box in Google Maps

By: Naresh

Naresh — Tue, 01 Mar 2011 07:08:06 +0000

Hi,

I have used ur code. but i m not able to see the any bounding box….

Can u please help me on this….

Rerads,
Naresh

By: buy kinect

buy kinect — Sun, 24 Oct 2010 09:50:42 +0000

Hello,

I have a inquiry for the webmaster/admin here at http://www.svennerberg.com.

Can I use some of the information from this post above if I give a link back to your website?

Thanks,
Alex

By: Grapsus

Grapsus — Fri, 30 Jul 2010 15:17:02 +0000

Here is an adaptation of this code I made for API v3 :
http://grapsus.net/blog/post/Google-API-v3-fit-map-zoom-and-bounds-to-all-markers

By: Toleti S

Toleti S — Tue, 17 Nov 2009 16:32:37 +0000

We have an image with two points in the middle and the bound area in pixels only and two reference points in the image with their pixel coordinates. We can get a zoom/scale for the image based on the above data.

We also know the latlng for the above two reference points.

How do I set the box north-east and south-west corners so that I can place it on the map.

Appreciate any help/pointers.

Thanks

By: gopi

gopi — Fri, 05 Jun 2009 10:00:35 +0000

Here This bounded rectangle is not working in all the cases
when we move the map at some zoomlevel

NorthEast (topRight) points (70.495574, -102.304688)
topRight[0] = 70.495574;
topRight[1]= -102.304688;

SouthWest(BottomLeft) points (-59.712097, 47.109375)
BottomLeft[0] =-59.712097;

and my point is under this getBounds

we have a condition like

if(lat > bottomLeft[0] and lat BottomLeft[1] and lng < TopRight[1])
{}
this condition falils in some points even though its under that Bounded Rectangle
and the actual point is (30.145127,75.234) between those top and bottom points

By: Alex O'Byrne

Alex O'Byrne — Sun, 22 Feb 2009 13:01:01 +0000

OK that didn’t post directly… I’ll reformat it and post again later.

By: Alex O'Byrne

Alex O'Byrne — Sun, 22 Feb 2009 12:59:53 +0000

If you’re getting the lat and long from a collection of Ruby objects.

Here’s the method:

# returns a hash of top right and bottom left bounds
def self.bounds(collection)
top = 0
bottom = 0
right = 0
left = 0
initially_set = false
collection.each do |point|
if point.lat and point.long
if !initially_set or point.long > top
top = point.long
end
if !initially_set or point.long right
right = point.lat
end
if !initially_set or point.lat < left
left = point.lat
end
initially_set = true
end
end
# you could add 10% to each value here
# if your map is correct portioned (otherwise)
# your centre will be skewed
# now create the hash
result = Hash.new
result[:top] = top
result[:bottom] = bottom
result[:right] = right
result[:left] = left
return result
end

And then in the map definition…

// if we have a collection of items, set the map to fit them all
// Define the two corners of the bounding box
var sw = new GLatLng(, );
var ne = new GLatLng(, );
var bounds = new GLatLngBounds(sw, ne);

By: Gabriel Svennerberg

Gabriel Svennerberg — Thu, 29 Jan 2009 13:59:45 +0000

Aiska: After looking at your code again it occurred to me that there's a problem in it and that is in how you extend the bound. You don't use the new keyword when you create a new GLatLng. It should be: bounds.extend(new GLatLng(lat, lng)); Maybe that's the reason it doesn't work properly? I haven't looked at your new method yet.

By: Aiska

Aiska — Thu, 29 Jan 2009 10:32:40 +0000

Gabriel Svennerberg: yeah that's right maybe this is bugs in API. I found new method how to set zoom level of a google map base on markers. maybe you can check this out for your reference. Thanks Set zoom level of a google map base on markers

By: Gabriel Svennerberg

Gabriel Svennerberg — Wed, 28 Jan 2009 12:28:26 +0000

Aiska: Cool! I never thought of that, but naturally that’s one way to do it. Thanks!

I have never encountered the error you’re talking about myself. Could be a bug in the API?