[VHFcontesting] Grid map overlay for google maps

John_JK Kalenowsky_K9JK k9jk73 at msn.com
Fri Feb 1 17:22:02 EST 2013

Primarily for Paul KE1LIFN41 but leaving the list copied, expecting that others might be interested or have some additional ideas.

This can be done using KML within Google Maps.

Here's a link to a Google Map that I created showing the MAJOR (2-letter) Grid Borders over the U.S.:


And here's a KML Structure that will create ONE of the lines shown in that map (40N from 126W to 60W):


You will also need a KML Header such as:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://earth.google.com/kml/2.2">

before the KML Line(s) and a KML Trailer such as:


Following the KML Lines(s) to have a complete KML file that can be 'imported' to Google Maps.

NOW, to put TEXT on the map to 'name'  each Grid Square is something that I've NOT figured out.

An alternate approach might be to draw each Grid Square separately and overlaying them but that will duplicate a LOT of line segments

73, JK (or K9JKEN52 if you prefer)

> From: barry at k7bwh.com
> To: vhfcontesting at contesting.com
> Date: Fri, 1 Feb 2013 10:16:22 -0800
> CC: paulrollinson at sbcglobal.net
> Subject: Re: [VHFcontesting] Grid map overlay for google maps
> It sounds like you're looking for example programming to the Google Maps API
> so you can display your own map in a web page with the Maidenhead grid
> super-imposed on it. Or maybe I've completely missed the point, in which
> case, never mind, nothing to see, move along...
> I've never seen a programming example for the general case of drawing a grid
> over a Google map that works at all different zoom levels. I'd love to see
> such an example, too.
> Here's an example of a single grid square drawn on a Google map that I
> designed to show just one grid at a time in Washington state:
> http://www.coilgun.info/rover_wa/CN87.htm 
> There may be some useful Javascript techniques in there for you to
> plagiarize. Hope it helps! 
> Another Google map tip: As a map user, you can get the lat-long at any point
> with a right-click and "what's here?".  And there is a browser add-on to
> display the lat-long at the mouse pointer while holding the Shift key. Both
> are clunky, but at least you can find grid transitions.
> Barry K7BWH
> barry at k7bwh.com   
> -----Original Message-----
> From: VHFcontesting [mailto:vhfcontesting-bounces at contesting.com] On Behalf
> Sent: Friday, February 01, 2013 8:24 AM
> To: vhfcontesting at contesting.com
> Subject: [VHFcontesting] Grid map overlay for google maps
> Hi Guys,
> I'm starting to do some planning that may or may not happen but I'm looking
> for a link to a gridmap overlay onto Google maps. This will be used to zoom
> in on potential locations.
> Google has a terrain feature so you can also view elevation as well as
> global views.
> Any help would be appreciated.
> 73,Paul, KE1LIFN41
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