Comments on: GMap geocoding – zoom level and accuracy

By: Aiska Hendra

Aiska Hendra — Thu, 29 Jan 2009 10:16:30 +0000

Hi Dusan,

Thank’s for the formula, that inspire me to improve it.

check this out.

http://aiskahendra.blogspot.com/2009/01/set-zoom-level-of-google-map-base-on.html

By: Fatalerror

Fatalerror — Wed, 05 Nov 2008 15:39:33 +0000

Hey Dusan, how can i use another url for geocoding?
Thank you!

By: guigui

guigui — Mon, 10 Mar 2008 09:56:23 +0000

hey Dusan,

thanks for taking the time.

Cheers!

By: Dusan

Dusan — Thu, 06 Mar 2008 09:42:32 +0000

JavaScript has only natural (base E) logarithm.

logarithm base 2 can be rewritten as

log 2 (y) = Math.log(y)/Math.log(2)

where Math.log() is natural JavaScript logarithm.

So equation would look something like:

var zoom = 18-Math.log(3.3*range/Math.sqrt(x*x+y*y))/Math.log(2)

By: guigui

guigui — Wed, 05 Mar 2008 15:28:02 +0000

hi there,
Very Interesting investigation but i can’t make it work with javascript…

18-Math.log(3.3*4/Math.sqrt(398*398+256*256), Math.LOG2E)

if u have any ideas!

Cheers.

By: Dusan

Dusan — Mon, 25 Feb 2008 07:39:24 +0000

I am using different url for geocoding.

http://maps.google.com.au/maps?q=Poprad,Slovakia&output=kml

If you check docs about kml
http://code.google.com/apis/kml/documentation/kml_tags_21.html#range
it describes range as a distance from the earth. Distance returned by google is bigger for big cities and smaller for smaller cities.

By: JulienC

JulienC — Sun, 24 Feb 2008 10:42:02 +0000

This formula looks nice
But, can you please explain how you found it? In particular, I don’t know what the range parameter is. It doesn’t seem to be present in the doc.