The building code for all habitable rooms in New York requires the total area of all the windows in the room to at least be one-tenth the room's floor area \cite{URL_IDb}. Using the total floor areas of the buildings obtained from MapPluto data, we can determine the minimum area for windows. Dividing the required area for total windows by the standard window size will give us the approximate number of windows. We chose the window size of 27 x 52 inches. The residential window is often around 24 to 30 inches wide and 48 to 56 inches tall so we picked the middle point for each dimension. The standard area per window, therefore will be 0.1875 squared feet. Since we can only observe windows on a 2D image, we had to take a fraction, one-fourth of the total windows as each building has four faces. Our calculation for the number of window is summed up by the following equation.
   Number of Windows  =  Floor Area   x    Minimum Window to Area Ratio * 1/ Standard Window Size * 1/4

Instrumentation Upgrade

The camera we used previously is a bit complex. It needs a shutter and a corresponding circuit to capture images. So we find a new camera which is more suitable for our project.
The new camera is a digital camera which can be controlled directly by computer program (C++ & python). To compare the performance between two cameras, we choose a region of buildings and capture images with two cameras 
Below are the images taken by two cameras at the same location and time: