Pictorial Drawings
What is a Pictorial Drawing and give one example of a pictorial drawing
It is a realistic Picture
Example:
3d
What is a Orthographic Projection?
A three-dimensional method of projection, drawn in 2D where each face of drawing is seen as a separate view.
What are Scales used for?
Scales are used on a map to determine distance between places.
It helps to determine the distance “on the ground”. It is the relationship between the distance on a map or diagram and the actual distance in real life
What are secondary points or intercardinal points?
Northeast, Southeast, Southwest and Northwest
What are the vertical lines which run from north to south known as?
eastings
What are Three types of Pictorial Drawings
Isometric Projection
Oblique Projection
Perspective Projection
How many Types of Orthographic Projection are there?
There are 2 types of Orthographic Projection
What are types of Scales?
Word Scale
Linear Scale and
Representative Fraction Scale (R.F. Scale)
What are the Cardinal Points on a compass?
North
East
South
West
What are the horizontal lines which run from east to west known as?
Northings
What is a Isometric Projection?
Displays objects where the three axes (height, width, and depth) are equally spaced at 120-degree angles.
Vertical lines remain vertical, while horizontal lines are drawn at 30 degrees to the base.
No perspective distotion
What are the 2 types of Orthographic Projection?
First Angle Projection
Third Angle Projection
What is a Word Scale?
A statement scale, e.g., one inch to one mile or One centimetre on the map represents 10 metres on the ground.
Who uses bearings?
Pilots
Boat Captains
Civil Engineers
Architects
Military Personnel
Surveyors
What do you notice about the numbers?
The Numbers along the top and bottom get larger as they move East. These are known as Eastings.
What is an Oblique Drawing?
What are two types of Oblique Drawings?
Show one face of the object in it's true shape, and the other faces recede at an angle, usually 45 degrees.
Two types: Cavalier Oblique and Cabinet Oblique
What is the First Angle Projection
Front view is above plan and end views are switched i.e. Right drawn on left and vice versa.
What is a Linear or Line Scale?
A line divided into equal parts. It tells us how much map distance represents a certain real distance.
How to calculate an Angular Bearing?
Establish where you are starting from (A) and where you are going to (B).
Using a ruler, draw a line from A to B.
Draw a vertical line through your starting point, pointing towards North. This is your North line!!!
Place the protractor's center point on Point A. Align the 0° mark on the protractor with the North line.
Read the angle where the line to Point B crosses the protractor. Record your answer. Bearings are recorded with three digits (Eg. 050°)
How would I describe the location of the gray square using 4 figure grid referencing?
Start with the EASTINGs (E comes before N in the alphabet). Pick the LOWER LEFT NUMBER EASTING first.
Next look at the two numbers of the NORTHING. You always pick the bottom left number.
What is a Perspective Drawing?
Objects appear smaller as they get further away, simulating human eye perception.
One-Point, two-point, and three-point perspectives are the common types, based on the number of vanishing points
What is the Third Angle Projection
Plan is drawn above front elevation; end views are drawn on same side seen.
i.e. Right on the right side and left on the left side
What is a Representative fraction scale?
Representative fraction scale is a way of showing the scale of a map using a ratio.
How do I know where I am starting?
If the question is posed “Give the direction from A to B.”, your starting point is A and your end point is B.
If the question is posed “Give the direction of A from B.”, your starting point is B and your end point is A.
How to find a 6 figure grid reference?
1.Firstly, find the 4-figure grid reference
2.You must now divide the easting and northing into 10 lines so you can find a precise location.