1. A method for calibrating a camera system having a plurality of cameras on a housing, comprising: aligning the housing to a coordinate system; calibrating each camera of the plurality of cameras with respect to the coordinate system, wherein calibrating includes: exposing each pixel in the camera to two distinct points, wherein the locations of the two distinct points within the coordinate system are known, determining a pixel vector for each pixel based on the locations of the two distinct points, and generating a pixel vector map including pixel vectors for each of the pixels in the camera; and generating a composite pixel vector map including pixel vector maps for each of the plurality of cameras.