Introduction to Air Photo Interpretation Flashcards
What information can I find on an air photo?
Unlike a map, features on an aerial photograph are not generalized or ?. Air photos record all ? features on the Earth’s surface from an overhead perspective. Although the features are visible, they are not always easily ? . The process of studying and gathering the information required to identify the various cultural and natural features is called ??. With careful interpretation, air photos are an excellent source of spatial data for studying the Earth’s environment.
symbolized
visible
identifiable
photo interpretation
Factors to assess to identify a feature
?
The form of an object on an air photo helps to identify the object. Regular uniform shapes often indicate a human involvement.
Shape
Similar to shape, the spatial arrangement of objects (e.g. row crops vs. pasture) is also useful to identify an object and its usage.
Pattern
A measure of the object’s surface area (e.g. single-lane vs. multi-lane highways).
Size
?
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).
Tone/Colour
?
A shadow provides information about the object’s height, shape, and orientation (e.g. tree species).
Shadow
?
The physical characteristics of an object will change the way they appear on a photo (e.g. calm water has a smooth texture; a forest canopy has a rough texture).
Texture
?
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).
Association/Site
