1 B. 2 Lab. No. 2
USE OF AERIAL PHOTOGRAPHS IN THE STUDY OF NATURAL HAZARDS

1. INTRODUCTION:
The interpretation of vertical aerial photographs has proved to be an effective technique in the preparation of environmental-engineering-geologic maps. No other technique can provide a three-dimensional overview of the terrain from which the inter-relations of topography, drainage, surface cover, geologic materials, geologic structure, geohazards and human activities on the landscape can be viewed and evaluated.
The purpose of this exercise is to introduce you to the techniques of aerial photo- interpretation and preparation of an environmental-geologic map of Harbour View area, St.Andrew, Jamaica.

2. PRINCIPLES OF ANALYSIS:
EXAMINE THE PHOTOGRAPHS PROVIDED WHILE YOU READ THIS SECTION.
See SHEET # 1 for basic principles of aerial photo-interpretation. This will help you to set the photos for stereoscopic viewing.

The interpretation of aerial photographs involves:

a. Examine the photographs to get a 3-D perception,
b. Identify ground conditions by observing certain elements appearing in the photographs and
c. Using photo-interpretation techniques, analyze specific problems by the association of ground conditions with interpreter's experience.

The quality and reliability of interpretations is improved by subsequent field checks, which is an essential component of all mapping projects.