ordnance survey maps (ppt)
TRANSCRIPT
Lesson Four:Ordnance Survey Maps(Year four)
Types of maps
View a range of different types of map on your table (Ordnance Survey maps, tube maps, bus maps, road atlas etc.)
Which would be most useful to find a house, school, or local landmark? Why?
Which maps show human features, which show physical features, and which show both?
Ordnance Survey Map
Ordnance Survey Map Extract, Ordnance Survey © Flickr
What human and physical features can you spot on this map?
What is an OS map?
Ordnance Survey is Britain’s mapping agency. OS maps show human and physical features of the
environment:- Contour lines to show land height, hills, valleys.- Rivers, grassland, forest, marsh, lakes, etc.- Man-made features such as canals, bridges,
footpaths, buildings and roads. OS maps are particularly useful for anyone wishing to
navigate on foot, such as long-distance walkers.
Each square on an OS map has a unique four-figure grid reference.
The grid reference is the easting and northing values of a square combined into one number.
Four-figure grid references
Northings and Eastings
Northing
Map Skills Subject Knowledge Animation © RGS-IBG
Reading four-figure grid references
1657 58
5815How do we get these numbers?
15
1659
15
14595857
14
5714
Look at the bottom left-hand corner of the grid square.
The number on the vertical line is the Easting.
The number on the horizontal line is the Northing.
Put these numbers together to give your four-figure grid reference for that square.
Finding the grid reference on a map
Reading four-figure grid references
16
57 58
5815
How do we get these numbers?
15
1659
15
14595857
14
5714
Easting Northing
Digimap for Schools
Grid references
Watch the RGS-IBG subject knowledge animation
Begin at 5:10.
Map Skills Subject Knowledge Animation © RGS-IBG
Main Activity
Play map symbols bingo. Mark the symbols off your bingo sheet
once you hear them read out.
Plenary
Why do maps use symbols rather than words?
Play map symbols snap on the BBC website