In the LAS 7.0, the location of a projection or other (X,Y) coordinate is defined to be located at the center of a pixel. The diagram that follows describes coordinate locations when dividing a pixel into subpixel increments.
To calculate subpixel values from an enlarged (interpolated) image window (as in tiepts), the following equation is applied:
1 (x-1) x' = .05 + ---- + ---- 2*zoom zoom 1 (y-1) y' = .05 + ---- + ---- 2*zoom zoom
x and y are integer image coordinates in the enlarged image
x' and y' are noninteger image coordinates in the original image
zoom is the enlargement factor