Photo interpretation and its applications

Releted to the engineering survey

1. Manish Galav
11710834
Badal
11710052

2. DEFINITION
• Identifying and recognizing objects in the aerial
photograph and then judging their significance in the
photograph.
• Oblique photographs are normally easy to interpret.

3. Factors to assess to identify a feature :

Shape
The form of an object on an air photo helps to identify the object. Regular uniform shapes often indicate a
human involvement.

Size
A measure of the object's surface area (e.g. single-lane vs. multi-lane highways).

Tone/Colour
The colour characteristics of an object, relative to other objects in the photo, are used to identify the feature
(e.g. sand has a bright tone, while water usually has a dark tone; tree species can be determined by the colour
of their leaves at certain times of the year).

5. Pattern
Similar to shape, the spatial arrangement of objects (e.g. row crops vs. pasture) is also useful to identify an
object and its
Shadow
A shadow provides information about the object's height, shape, and orientation (e.g. tree species).
Texture
Texture is the frequency of the change in tone in the photographic image. As the photoscale is
reduced, the texture of the given object becomes progressively finer and eventually dissapears.

6. Association/Site
Associating the presence of one object with another, or relating it to its environment, can help
identify the object (e.g. industrial buildings often have access to railway sidings; nuclear power
plants are often located beside large bodies of water).

7. Applications:


Agriculture
•crop type classification
•Crop condition classification
•Crop yield estimation
•Mapping of soil characteristics
•Mapping of soil management practices

Forestry
•Forest cover
•Type of forest
•Vegetation density
•Deforestation
•Forest fires

8. Aerial photograph taken while Nuclear Testing in Pokhran, India