Perspective Cylindrical Projection: Point of Light
Perspective cylindrical projection is a type of map projection where points on a sphere (the generating globe) are projected onto a cylinder. In a perspective projection, the projection lines all converge at a single point, known as the point of light or center of projection.
Identifying the Projection Point of Light
For a perspective cylindrical projection, the specific location of this point of light determines the characteristics of the resulting map projection. The question asks to identify this point concerning the 'generating globe'.
- The projection involves casting light rays from the point of light through points on the generating globe onto the projection surface (in this case, a cylinder).
- In standard definitions of perspective cylindrical projections, especially those used in cartography, the point of light is located at the centre of the generating globe.
- Lines are drawn from this center, passing through points on the globe's surface, and intersecting the cylinder to form the projected image.
Therefore, the point of light required to cast the image in a perspective cylindrical projection is the centre of the generating globe.
Answer Analysis
Comparing this with the options provided:
- Option 1 is incorrect.
- Option 2 is relevant for specific parallel projections, not typically perspective ones.
- Option 3 correctly identifies the point of light as the centre of the generating globe.
- Option 4 describes the point of tangency, not the center of projection for this type.
The correct option is C.
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- Kalpsutra, the illustrated canonical text is from:-
- The Harappan city almost exclusively devoted to craft production was-:
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- Who among the following was not a member of the constituent assembly:-
