1. A method of determining a geometric parameter of a region from an image, wherein the image is collected to develop a navigation database, the method comprising: determining calibration values corresponding to a camera mounted on a vehicle; capturing a plurality of images of geographic features, the plurality of images captured by the camera mounted on the vehicle; identifying a single image from the plurality of images; calculating a vector from a center of the camera through a point in a single image; calculating an intersection of a ground plane and the vector from the center of the camera through the point in the single image; and determining a geometric parameter of a region in the single image based on the determined calibration values and the intersection of the ground plane and the vector from the center of the camera through the point in the single image, wherein the geometric parameter is a real-world distance.