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Write a short note on developable surface and zenithal projections.

Answer» <html><body><p></p>Solution :A developable surface is one, which can be flattened, and on which, a network of <a href="https://interviewquestions.tuteehub.com/tag/latitude-540038" style="font-weight:bold;" target="_blank" title="Click to know more about LATITUDE">LATITUDE</a> and longitude can be projected. A cylinder, a cone and a plane have the property of developable surface. <br/> On the basis of nature of developable surface, the projections are classified as cylindrical, <a href="https://interviewquestions.tuteehub.com/tag/conical-929271" style="font-weight:bold;" target="_blank" title="Click to know more about CONICAL">CONICAL</a> and zenithal projections. <br/> (i) Cylindrical Projections: These are made through the use of cylindrical developable surface. A paper-made cylinder covers the globe, and the parallels and meridians are projected on it. <br/> (ii) Zenithal projection: It is directly obtained on a plane surface when plane <a href="https://interviewquestions.tuteehub.com/tag/touches-1423978" style="font-weight:bold;" target="_blank" title="Click to know more about TOUCHES">TOUCHES</a> the globe at a point and the graticule is projected on it. Generally, the plane is so placed on the globe that it touches the globe at one of the poles. These projections are further subdivided into normal, <a href="https://interviewquestions.tuteehub.com/tag/oblique-1127501" style="font-weight:bold;" target="_blank" title="Click to know more about OBLIQUE">OBLIQUE</a> or polar as per the position of the plane touching the globe. <br/> (a) Normal Projection: If the developable surface touches the globe at the equator, it is called equatorial or normal projection. <br/> (b) Oblique Projection: If it is tangential to a point between the pole and the equator, it is called the oblique projection, <br/> (<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a>) Polar Projection: If it is tangential to the pole, it is called the polar projection.</body></html>


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