Excerpt from Base Map Analysis of Coastal Changes Using Aerial Photography This report describes a technique to quantify changes in shoreline position using time - sequence aerial photos. Aerial photos, which are usually available more often than repetitive ground surveys, may be the only source of past shore line change data. The technique was developed during a sediment budget study conducted for the u.s. Army Engineer District, Philadelphia. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.