Attached are a few slides from the ATSP/vWLAN course covering heat maps. There is a short section in the vWLAN Admin Guide also.
The key is after loading the floor plan (JPG or PNG) file, you will need to calibrate and then place the APs. After calibrating, all APs will be stacked in the lower left corner of floor plan. Drag APs to position in proper location.
Beside for having a map that shows RF coverage, another benefit of heat maps is locating devices (Rogue AP for example). From the Status > Adjacent APs menu, select the Source MAC. If it has recently been seen, a cirlce will show the area the device is in on the map.
vWLAN HeatMaps.pdf 481.3 K
This explanation is based on vWLAN 126.96.36.199. YMMV when using different versions.
The map feature is vWLAN is fairly simplistic. In addition to your floor plans, you will also need to know measured dimensions for calibration purposes. Alternatively, you could use the width and length.
You first create a map under Status > Maps. Input an appropriate Name, browse to your image file, select a Map Type and Map Environment from the drop down menus, choose which APs will be placed on the map, then check Use Calibration or input the Width and Length. Click Create Map to finish the initial creation step.
If you choose to use calibration, then you will be shown the uploaded image with two red targets in the top left. The targets are on top of each other, so do not be alarmed if you only see one. Click and drag one target to the edge of known object, for example, the corner of a building or wall. Drag the second target to another known object, for example, the opposite corner of the previous building or wall. Input the distance (in feet) between the two targets to calibrate the map distance. Click Calibrate to finish this step.
Now you can drag your APs onto the map. You will also see a few options at the top of the map. You can set a cutoff signal level (ie. what's the lowest acceptable signal strength), select the frequency to view (2.4 GHz or 5 GHz), and filter channels or SSIDs. The AP basic coverage area (BSA) will be shown based on the current channel and power settings of each individual AP.
Let me know if this helps or if you have additional questions.