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. 2015 Mar 4;15(3):5311–5330. doi: 10.3390/s150305311

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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(a) Grid map result of magnetic field intensity distribution; (b) grid map result of light intensity distribution; (c) grid map of WiFi access point number distribution; (d) grid map of intensity distribution of one WiFi access point.