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July
03

Map of WiFi coverage in Controguerra

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This is below the actual coverage, in the jargon footprint, measured at street level and in open fields, on the territory of Controguerra (TE), the current service HotSpot WiFi Wi4Free .

The green areas are reached by a good quality signal, below-70dBm, the yellow, from a discreet quality of the signal, say from-70dBm to-80dBm and orange zone at the edge of a quality sufficient to signal - 80dBm to-89dBm. The areas in red are areas where the signal is present but not enough to make the wireless connection.

This footprint was generated, as expected, taking into account the quality of the signal detected from the roadway, in an open field. Therefore, the quality of the link may vary defect realized within buildings or in excess, when measured, for example, at altitudes over the road.

The map was made using raw data derived from the analysis software of the wireless spectrum NetStumbler

  # $ Creator: Network Stumbler Version 0.4.0
 # $ Format: wi-scan with extensions
 # Latitude Longitude (SSID) Type (BSSID) Time (GMT) [SNR Sig Noise]
 # (Name) Flags Channelbits BcnIntvl
 # $ DateGMT: 07/02/2010
 N 42.8540700 E 13.8234967 (wi4free.com) BSS (00:0 c: 42:68:63:51) 17:47:58 (GMT) [17 66 49] # () 0421 00001000
 N 42.8540700 E 13.8234967 (wi4free.com) BSS (00:0 c: 42:68:63:57) 17:47:58 (GMT) [13 62 49] # () 0421 00000002
 N 42.8540700 E 13.8234967 (wi4free.com) BSS (00:0 c: 42:68:63:57) 17:47:59 (GMT) [13 62 49] # () 0421 00000002
 N 42.8540700 E 13.8234967 (wi4free.com) BSS (00:0 c: 42:68:63:51) 17:47:59 (GMT) [17 66 49] # () 0421 00001000
 N 42.8540717 E 13.8234967 (wi4free.com) BSS (00:0 c: 42:68:63:57) 17:47:59 (GMT) [13 62 49] # () 0421 00000002
 N 42.8540717 E 13.8234967 (wi4free.com) BSS (00:0 c: 42:68:63:51) 17:47:59 (GMT) [17 66 49] # () 0421 00001000
 N 42.8540700 E 13.8234950 (wi4free.com) BSS (00:0 c: 42:68:63:51) 17:48:00 (GMT) [17 66 49] # () 0421 00001000
 N 42.8540700 E 13.8234950 (wi4free.com) BSS (00:0 c: 42:68:63:57) 17:48:00 (GMT) [13 62 49] # () 0421 00000002
 ... 

The data were then analyzed by a little script in Perl for creation of the maps on Google Earth.

For the collection of data was used the following instruments:

  • a portable Aspire One place within un'autovettora
  • a USB WiFi LinkSys WUSB600N placed, through a USB extension cable on the roof of the car
  • Bluetooth receiver GPSSlim240 Holux GPS for position detection apparatus

The map below identifies the sampling points detected by the instrumentation

To derive the signal quality on the whole was used the algorithm described in the article " Toolkit for Automatically Constructing Outdoor Radio Maps "of Mr Kay Connelly, Yong Liu, Dan Bulwinkle, Adam Miller and Ian Bobbitt Department of Science 'Information Indiana University (USA), in order to interpolate the sampled data and get the footprint shown at the beginning of the article.

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One Response to "Map of WiFi coverage in Controguerra"

  • [...] As you may recall, the WiFi is active area for tourists and citizens of Controguerra and right after recording, for a month to navigate to a maximum of 8 hours per day in the areas covered by the service. [...]

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