Sat., Nov. 5th

I am wondering whether it might be best to locate the detectors farther apart in the building at CLC, to improve our angular resolution.

I got a building outline from the Leon County GIS.  It is not very detailed, but it gives you some idea of the building size and layout.  Here are a couple of views (click to zoom):

Building plat with image overlay from
Property Appraiser GIS.  This one has
dimensions of various line elements.

Building plat with image overlay from
Base Map GIS.  This one has terrain contours.

I have overlaid on these a triangle showing one (potentially) possible arrangement of detectors for maximum spacing.  The long side of the triangle is about 185' and the shorter sides are about 150'.  Altitude of the building is about 190' above sea level.

Here is another, slightly higher-resolution image from Google Earth:

Another aerial building image, from Google Earth.

For future reference, the location of the push-pin is 30°26'25.32"N,  84°17'0.22"W.  Google agrees that the altitude there (where the ground used to be, I assume) is about 190' above sea level.

Finally, here's another, even higher-resolution, but skewed, image from Google Maps:

Aerial or satellite image from Google Maps.

According to Google Maps, the coordinates of the green arrow are 30.440406, -84.283404.  Converted using http://www.gpsvisualizer.com/calculators, that is N30°26'25.462", W84°17'0.254", i.e., within less than 1 second of arc of the Google Earth coordinates from earlier.  A second of latitude is 101 feet and a second of longitude at this latitude is about 87'.  Based on the differences of 0.142" and 0.034", we're within ~14' on the N-S axis and about 3' on the E-W axis.  The larger N-S difference can be accounted for by the fact that the aerial photos were taken at different angles, so it was hard to eyeball where the green arrow should be.

After we install our GPS unit, we should take long-term averages of the position readings to get a more accurate idea of the position of the antenna.  (We could include code for this in the server, and test it here in the lab.)