Measure percent photodetector area within an ISA region pdArray = sensorPDArray(ISA,spacing) Create an array that measures the percentage of area of the photodetector contained within each square in a grid spanning the pixel locations. The code is used as part of the spatialIntegration calculation. The spacing indicates the fineness of the grid on a unit region (i.e., 1 is the center-to-center spacing between pixels. This code assumes the shape of the photodetector is row-col separable (i.e. a rectangle or square). When spacing = =1, this is the same as the pixel fill factor (0,1). See also: spatialIntegration Copyright ImagEval Consultants, LLC, 2003.