I wanted to test how well the 3D plots overlaid the Signal Plots. So I did a little test on a cheapy AP I purchased to handle my wireless IP security cameras. The NS log was taken over a 3-4 day period using a standard USB dongle with toothpick antenna. The survey resulted in over 700 signal readings.
You might notice there is a GPS shift of 15 or so feet to the SW that took place on one of those days.
I was really surprised to discover how far the little POS broadcast it's signal, considering there's a lot of trees.
http://www.rjpi.com/misc/corel023.jpg
btw.. I forgot to mention you'll find a number at the end of each AP's SP folder name. That number represents the total number of signal readings taken for that AP. Once you drill down to the signal placemarks the number represents the signal reading as an absolute value.
Interesting side note..
I've found numerous WISP in my cross country logs. They typically use the same MAC for 5 to 20 miles in areas I've driven. WISP providers here look as though they are using a WiMax backbone which breaks out to WiFi every mile or so. They show up as .5 mile long dashes on 1 mile centers. Normally there is another AP that's being used to fill in the gaps. Just look for another mac in the same series with a large signal data size.