WCS - heat maps

Hi,
i am having trouble generating heat maps. I have dwg image. Could you please correct me if i am doing the correct thing ?
1. Monitor -> Maps
2. New Campus then it asks for a image file name which i will skip (usually i use google maps to locate the place)
3. The next page askes me Dimensions - Horizontal and Vertical Span - which i dont have - what do i give htis as ?
4. Now i click on test and -> new Building
5. I give it name, contact, number of floors and then it asks for Horizontal and vertical span which i dont have dimensions ?
6. say if i give an approximate value and then click New floor area -> then choose my dwg file - it comes up with incorrect measurement vlaue for horizontal and vertical span. I know the area of the dwg file would be 5000 sq feet but the software says it is only 200 sq feet and 1 AP is more than enough (planning mode)
could someone please help me correct me ?
Thanks

@Scott - i did a map editor and used the coverage area tool and marked the area. then did recalcualte but does not seem to work. Think it calculates based on the initial dimensions you give for the campus, does it ?
@ravi - when you site survey do you mean external site survey or the one on the wcs software (heap maps) ?
Also after generating heat maps - i know RED is a good signal strength but what about slight yellow - how good is this signal strength ? do we have a colour coding for the signal strenght ?
Thanks

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