Скачать презентацию Grid Area References It can be Скачать презентацию Grid Area References It can be

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Grid & Area References • It can be difficult to find places or features Grid & Area References • It can be difficult to find places or features easily on a map. •

Topographic maps are large scale and we use these for Area and Grid references Topographic maps are large scale and we use these for Area and Grid references

So how do we locate features on a Topographic map? • http: //news. bbc. So how do we locate features on a Topographic map? • http: //news. bbc. co. uk/2/hi/uk_news/wales/north_west/7824895. stm • This BBC link details the importance of Grid References for emergency services to reach rural areas. • We can locate places easily on a topographic map by using the maps gridlines. • On a topographic map the vertical ( )lines are called eastings because they increase in value as we move eastward. • The horizontal ( ) lines are called northings because they increase in value as we move northwards.

18 17 16 N 15 Northings 22 23 24 Eastings 25 26 27 18 17 16 N 15 Northings 22 23 24 Eastings 25 26 27

Area Reference • Features such as a small lake, quarry or village are usually Area Reference • Features such as a small lake, quarry or village are usually located by means of an Area Reference (AR) • To find the (AR) of a feature we use the coordinate in the lower left-hand corner of the grid square in which the feature is located. • You always read the easting first then the northing. (hint to remember E comes before N in the alphabet) • An area reference always has 4 figures • Into the house and up the stairs” may help you remember!! EXAMPLE: AR 3363 easting northing

The Area Reference of the house is: 18 AR 2317 Remember with (AR) you The Area Reference of the house is: 18 AR 2317 Remember with (AR) you use the bottom left hand corner 17 What is the (AR) for: The plane: AR 2215 16 The boy: N AR 2316 15 Northings 22 23 24 Eastings 25 26 27

Area references Time now for a little test. FOUR squares are going to be Area references Time now for a little test. FOUR squares are going to be highlighted and you have TEN seconds to write down the area reference for each square. 39 10 38 8 7 6 5 A 9 4 3 2 1 37 36 35 21 22 23 24 25 26 CLICK to CLICK for start. . . the next square A

Area references 39 10 38 8 7 6 5 A 9 4 3 2 Area references 39 10 38 8 7 6 5 A 9 4 3 2 1 B 37 B 36 35 21 22 23 24 25 26 CLICK for the next square

Area references 39 10 38 8 7 6 5 A 9 4 3 2 Area references 39 10 38 8 7 6 5 A 9 4 3 2 1 C 37 B 36 C 35 21 22 23 24 25 26 CLICK for the next square

Area references 39 10 38 8 7 6 5 A 9 4 3 2 Area references 39 10 38 8 7 6 5 A 9 4 3 2 1 D D 37 B 36 C 35 21 22 23 24 25 26 CLICK for the next square

Area references A = 2238 B = 2536 39 A C = 2235 38 Area references A = 2238 B = 2536 39 A C = 2235 38 D = 2337 D 37 B 36 C 35 21 22 23 24 25 26 CLICK get How did you. TO on? CHECK EACH ANSWER

Grid References • We can locate relatively small and more specific features on map Grid References • We can locate relatively small and more specific features on map by using Grid Reference (GR). • (GR) locates the exact point on the grid. • Unlike (AR), Grid Reference uses 6 figures. -The first two numbers of each coordinate refers to the eastings and northings that surround the map. - The third number needed to complete each coordinate is obtained by dividing each easting and northing into tenths. Dividing the easting and northing into tenths Example: GR 335638 easting northing

What is the grid reference (GR) for the ball in which the boy is What is the grid reference (GR) for the ball in which the boy is about to catch? 18 17 Answer: GR 238169 16 N 15 22 Northing 23 24 Eastings 25 26 27

Come up to the Interactive White Board Come up to the Interactive White Board

Compass Directions 68 F H I B 66 21 22 E NW D A Compass Directions 68 F H I B 66 21 22 E NW D A 67 J N C NE W G 23 E SE SW S 24 What direction are you walking ? A C G D F H I J B E A

Interactives • http: //mapzone. ordnancesurvey. co. uk/map zone/Pages. Homework. Help/maptivity/gridr eferences/ • http: //geographyfieldwork. Interactives • http: //mapzone. ordnancesurvey. co. uk/map zone/Pages. Homework. Help/maptivity/gridr eferences/ • http: //geographyfieldwork. com/Test. Grid. Intr o. htm

CLASS EXERCISE Give the (AR) for the following features: 1. Church; 2. Village Hall; CLASS EXERCISE Give the (AR) for the following features: 1. Church; 2. Village Hall; 3. Grove farm; 4. The dairy farm; 5. The town of Little Plumpton; 6. The entire (AR)’s for Gibbet Wood; 7. The (AR)’s that Dale Road passes through; 8. The approximate (GR) of Grove farm.

Interactives • http: //www. mape. org. uk/startower/maps/re sources/map 1. htm • http: //www. mape. Interactives • http: //www. mape. org. uk/startower/maps/re sources/map 1. htm • http: //www. mape. org. uk/startower/maps/re sources/map 1 b. htm