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Re: How to include a scale bar (distance bar) on the Google Map Plot? [message #90982 is a reply to message #90981]

Wed, 20 May 2015 08:27

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Madhavan Bomidi writes:

> How can I include a scale bar within the Google Map plot below? (For example, I wanted something like the one at the following link: http://www.androidcentral.com/google-maps-update-brings-back -scale-bar).
>
> Assume the Google Map plot is something similar to the following:
> http://www.idlcoyote.com/gallery/google_map_plot.png
>
> Can anyone suggest me how I can do that?

You know how many meters/pixel you have in your image (it is in the
"scale" variable). Do some simple math to figure out how many pixels
would be required to display the range you want (maybe 500 meters in
this image). Then just draw an arrow or whatever that long on your image
with cgPlotS. Use cgText to label it.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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		How to include a scale bar (distance bar) on the Google Map Plot? By: atmospheric physics on Wed, 20 May 2015 07:29
		Re: How to include a scale bar (distance bar) on the Google Map Plot? By: David Fanning on Wed, 20 May 2015 08:27

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