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| Graphical
representation of a point data file produced by Netstumbler
of a single wireless network. |
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High-resolution
black and white aerial photography of the same area. |
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Point
file and image file are put into the same map projection/ coordinate
system and layered on top of one another in a Geographic Information
System (GIS). |
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Signal
strength values, collected for every point by Netstumbler, are
used to indicate the relative strength of each data point.
Blue = strong and
Orange = weak. |
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Using
the Inverse Distance Weighted (IDW) interpolation technique,
values are generated between the existing point data to recreate
what that signal strength should be for the entire network. |
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click
here for a larger
version |
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The
final map shows a visual representation of the field of signal
strength emitted by a wireless network device. The gradient
from dark blue to orange represents both strong to weak signal
reception and high to low network speed. |
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