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AERIAL & TERRESTRIAL SCANNING

AERIAL IMAGERY

Introduction

Photogrammetry is a surveying and mapping technique which can be used in various applications. There are many uses of Photogrammetry in the surveying industry such as topographic mapping, site planning, earthwork volumes, production of digital elevation models (DEM) and orthphotography maps. It is also useful in a vast selection of industries such as architecture, manufacturing, police investigation, and even plastic surgery.

The word “photogrammetry” is composed of the words “photo” and “meter” which means measurements from photographs. The classical definition of photogrammetry is: The art, science and technology of obtaining reliable information about physical objects and the environment, through processes of recording, measuring, and interpreting images on photographs. 

Photogrammetry is a skilled profession for the reason that obtaining reliable measurements requires certain skills, techniques and judgments to be made by the Photogrammetrist and experience is an advantage. It is a science and technology because it takes information from an image and transforms this data into meaningful results.

Types of Photogrammetry

There are two types of Photogrammetry, Aerial Photogrammetry and Terrestrial (Close Range) Photogrammetry.
 

- Aerial digital photogrammetry, often used in topographical mapping, begins with digital photographs or video taken from a camera mounted on the bottom of an airplane. The plane often flies over the area in a meandering flight path so it can take overlapping photographs or video of the entire area to get complete coverage.
 

- Close-range, or terrestrial, digital photogrammetry often uses photographs taken from close proximity by hand held cameras or those mounted to a tripod. Close-range photographs can be used to create 3D models, but they are not usually used in topographical mapping. This type of photogrammetry is useful for the 3D modeling of many objects or areas such as buildings, automobile accident scenes, or movie sets.

Types of Photogrammetry

There are two types of Photogrammetry, Aerial Photogrammetry and Terrestrial (Close Range) Photogrammetry.
 

- Aerial digital photogrammetry, often used in topographical mapping, begins with digital photographs or video taken from a camera mounted on the bottom of an airplane. The plane often flies over the area in a meandering flight path so it can take overlapping photographs or video of the entire area to get complete coverage.
 

- Close-range, or terrestrial, digital photogrammetry often uses photographs taken from close proximity by hand held cameras or those mounted to a tripod. Close-range photographs can be used to create 3D models, but they are not usually used in topographical mapping. This type of photogrammetry is useful for the 3D modeling of many objects or areas such as buildings, automobile accident scenes, or movie sets.