## Which type of map gives 3D information in 2D format?

Map Projections. Maps are 2-dimensional (2D) representations of a 3-dimensional (3D) Earth. In a small area, Earth is essentially flat, so a flat map is accurate.

## Which projection system helps in studying 2D features of earth out of a 3 D feature?

A map projection is one of many methods used to represent the 3-dimensional surface of the earth or other round body on a 2-dimensional plane in cartography (mapmaking).

## What are the 3 types of map projections?

This group of map projections can be classified into three types: Gnomonic projection, Stereographic projection and Orthographic projection.

## What is the process that converts a 3D globe into a 2D map?

Similarly, a map projection is a method by which cartographers translates a sphere or globe into a two-dimensional representation. In other words, a map projection systematically renders a 3D ellipsoid (or spheroid) of Earth to a 2D map surface.

## Why second and fourth angle projections are not used?

Overlapping projection views create confusion in the drawing. Therefore the 2nd angle projection system is not used to draw engineering drawings. Similarly when the object is placed in the 4th quadrant both top and front view will overlap. Therefore fourth angle projection is also not used.

## Who uses third angle projection?

Orthographic Representation Third angle projection (figure 1.2) is used mainly in The United States and Canada whilst first angle projection (figure 1.1) is used mainly throughout Europe and the rest of the world.

## What is 3rd angle orthographic?

Third angle projection is one of the methods of orthographic projection used in technical drawing and normally comprises the three views (perspectives): front, top and side. (In a first angle projection, the top is placed below the front and the right side view is placed on the left.)

## What is the three regular views?

The top, front, and right-side views, arranged together, are called the three regular views because they are the views most frequently used. A sketch or drawing should contain only the views needed to clearly and completely describe the object.

## What is the position of object in 3rd Angle Projection?

Explanation: Third angle projection means the object is placed in third quadrant and the top view of the object is above the front view so the bottom view is below the front view.

## Why do we rotate HP by 90 degrees in clockwise direction while drawing projections?

As per rule of orthographic projection, to bring drawing views from three dimensional to two dimensional planes. Horizontal plane (HP) is rotated in the clockwise direction. Therefore Front view of point A will be in the vertical plane (V.P.) and the top view will be on the horizontal plane.

## Which angle projection is recommended by BIS nowadays?

Explanation: The Indian standards Institution now Bureau of Indian Standards, in its earlier versions of Indian standard (IS: 696) ‘Code of Practice for General Engineering Drawing’ published in 1955 and revised in 1960 had recommended the use of third –angle projection method.

## Why is third angle projection preferred?

In third angle projection, the object’s left side will be projected only if we watch from the left side of the object so the impression will fall to the left side of the front view and the right side view is placed on the right side of the front view.

## How do you find angle of projection?

The maximum height achieved by a projectile ignoring the air resistance is given by HM=U2Sin2 θ 2g… (1) where U is the initial velocity, θ is the angle of projection and g is the acceleration due to gravity. The horizontal distance covered by the projectile i.e. range is given by, R=U2Sin2 θ g…

## What is the symbol of first angle projection?

This symbol indicates the projection method used in the drawing. When the large end of the cone in the section view is closest to the top view, this is known as first angle projection. Traditionally, the first angle projection symbol is drawn with the top view on the left and the side view on the right.

## Which projection is recommended by BIS?

First-angle projection

## Why is margin kept in drawing sheet?

The margin helps to define where a line of text begins and ends. When a page is justified the text is spread out to be flush with the left and right margins. When two pages of content are combined next to each other (known as a two-page spread), the space between the two pages is known as the gutter.

## Which one is not a pictorial projection method?

► MCQ Exam ON : Axonometric Projection isometric This is the correct answer.

## Is axonometric a pictorial drawing?

Axonometric projection is a type of orthographic projection used for creating a pictorial drawing of an object, where the object is rotated around one or more of its axes to reveal multiple sides.

## What are the 3 pictorial drawings?

The three main types of pictorial drawings that are extensively used in architectural presentations are perspective drawings, isometric drawings, and oblique drawings.

## Is perspective a pictorial drawing?

In making a pictorial drawing, the viewing direction that shows the object and its details to the best advantage is chosen. Perspective drawings provide the most realistic, and usually the most pleasing, likeness when compared with other types of pictorial views.

## What is the purpose of pictorial drawing?

A Pictorial drawing provides a 3D image to help understand the shape of an object or to assist in interpreting a drawing.