Junior Cycle Geography CYCLONE Calculating an Irregular-Shaped Area
The total area of each grid square on a 1:50 000 map is 1 km². Use this method to calculate the approximate area of any irregular-shaped feature, e.g. a lake, a bay, a forest:
Tick off and count all the squares that are at least half-filled by the feature. This number will represent the approximate area of the feature in km². 85
92 93 94 95 96 85 84
Square (almost!) completely filled with the irregular- shaped feature (Westport Bay)
83 83 82
4. Westport Bay, Co. Mayo
81 92 93 94 95
7.3 Directions on an OS Map Directions on OS maps are given in the form of compass points.
22 23 24 25 31 31 N 1 30 3 S 2 29 29
Identify the following directions on figure 5, which shows an area of Galway:
28
5. An area of Galway
27 82 22 23 24 2527 28
1. From Clydagh to An tÁth Buí 2. From Corcullen to Tooreeny 3. From Pollagh to Pollnaclogha
9681 82
1. Calculate the area of the map in figure 4.
2. Finish calculating the area of the bay in figure 4.
84
Square more than half-filled with the irregular-shaped feature (Westport Bay)