Question

1. Prepare a summary of 150-250 words after watching video resources related to coordinate system, map projection and datum

Coordinate Map Projection-Video Resources

Note: For your ease and to avoid cumbersome downloading activity due to internet connectivity, I have chosen these video tutorials explaining different concepts. Please watch these as a part of your lecture notes.

Map Projections Explained - A Beginners Guide

https://www.youtube.com/watch?v=wlfLW1j05Dg

Introducing Coordinate Systems and Map Projections

https://www.youtube.com/watch?v=PICwxT0fTHQ

Map Projections

https://www.youtube.com/watch?v=nJ5r4HJMrfo

Everything you would want to know about Map Projections!

https://www.youtube.com/watch?v=dHT0ckOfScU

Different map projections

https://www.youtube.com/watch?v=qM87BDtXSSQ

Answer 1

Coordinate system- Basically two main coordinate systems are there

• Horizontal coordinate system- Further divided into 2 parts i.e. Geographic coordinate system and Projected coordinate system.

GCS- shows the values of distance, location or direction in the form of angular units i.e latitude and longitude and the surface is 3D.

PCS- Shows the values of distance, location or direction in the linear units i.e km. The reference surface is 2D.

• Vertical coordinate system- This coordinate system takes care of the height or depth values for mountains or river depth etc.

The vertical coordinate system can be further classified into two parts based on the datum surface(the surface which taken as reference for the measurement of height or depth):

Geoid- this is the global representation of mean sea level which shows that gravity is same everywhere on the surface(geopotential surface). Undulating in nature. The datum defined according to this is called Vertical datum.

Ellipsoid- This represents the mean sea level as reference for height and depth calculations. This is known as datum.

Map projection- In simple terms, This is the technique of projecting a 3D map on a plane surface. There are a lot of projection types done based on the type of study required by the user. For example Albers equal area, Stereographic, Azimuthal equidistant, Transversse mercator.