Document Type : Research Paper

Author

• Mahdi Modiri

Associate Professor of Urban planning, Malek-Ashtar University of Technolog

Abstract

Aerial photography can be carried out by any type of camera. Many of the utilized aerial photos are taken from a lightweight aircraft by thirty-five-mm cameras. Simplicity and low cost of taking photographs by thirty-five-mm cameras, especially for analyzing small areas, has made them an ideal sensor (the actual size of the images taken by this system is 36 * 24 mm2). In some cases, seventy-millimeter cameras are also used (the actual size of images by such systems is 55 * 55mm2). On the whole, in most cases of aerial photography a camera is used that has a suitable precision. These cameras are designed to allow for taking a large number of photos in rapid succession with geometric homogeneity.
Currently more than one hundred different types of cameras are used that can be categorized into one of four main categories:
1- Single-frame cameras
2 – Cameras with multi-lens frames
3. Strip cameras
4 - Panoramic cameras