OBJECTIVES: 1. TO DISCUSS THE CONTENT OF OUR REMAINING LESSONS. 2. TO INTRODUCE STUDENTS TO ORDNANCE SURVEY MAPS. 1A2 Geography 5 th May, 2015

Plans for this month… seven lessons remaining Only seven lessons remaining (including this class!). During the coming days, we will be focusing on the following:

Plans for this month… May 5 th – 19 th 5 th : Introduction to OS maps, scale and the national grid, and four figure grid references. 11 th : Four and six figure grid references*/ map symbols. 12 th : Measuring distance and area/ sketch maps*. 18 th : Revision – short answer questions. 19 th : Revision – long answer questions. (* Questions on grid references, and sketch maps will feature on the summer exam.)

Ordnance Survey Maps 1. What is a map? A map is a diagram that illustrates the entire world, individual countries, or regions within each nation state. 2. What are maps used for? Maps help people to navigate the world. 3. Who makes maps? cartographers Cartography Maps are prepared by people called cartographers. Cartography is the study and practice of making maps. 4. Is there a company that prepares maps of Ireland? Ordnance Survey Ireland Discovery Series Yes; Ordnance Survey Ireland (OSI) is the country’s national mapping agency. The OSI prepares the Discovery Series, the collection of maps we will be studying.

Ordnance Survey Maps SCALE The scale of a map refers to the measure of distance on a map that is equal to a certain distance on the ground. For example, the scale used on an OS map is 1:50,000. This means that every 1cm on the map is equal to 50,000cm (500m) on the ground. Therefore, every 2cm on an OS map is equal to 1km/ 1000m on the ground. (See page 106.)

Ordnance Survey Maps THE NATIONAL GRID Ireland and its territorial waters has been divided into twenty-five boxes, called subzones. (see page 106) Each box is identified by a letter. These boxes illustrate each part of the country in great detail. They measure 100km by 100km.

Ordnance Survey Maps THE NATIONAL GRID Each subzone can be further divided into boxes that measure 1km by 1km. Each of these smaller squares consist of horizontal lines called eastings and vertical lines called northings. Eastings and northings are used to give coordinates – i.e. specific points on a map!

Location We can locate specific points on a map using grid references. Grid references consist of the subzone letter and the numbers of the eastings and northings. Remember LEN when attempting to find a location on a map: L: Letter of subzone. E: Easting (horizontal lines/ they go across). N: Northing (vertical lines/run up and down).

Four Figure Grid Reference This is used to identify the position of an area or a specific grid square on a map. We look for the easting first, then the northing (in the door, and up the stairs!). The area of any one square identified in this way is 1km² (1km X 1km = 1km²). Let’s take a look at some examples – Question 1 page 114 & 116.

Homework Textbook, page 118, question 1.