Topographical map grids Topographical map grids are worked out in metres, with the grid lines being 1,000 metres apart. • 1:100,000 maps are divided into squares representing 1 km2, each square on the map being one square centimetre in area and representing 1 km2 on the surface of the Earth. • For 1:50,000 maps, the grid lines are 2 cm apart. Each square on the map is 2 cm by 2 cm (4 cm2) and represents 1 km2 on the surface of the Earth. • For 1:25,000 maps, the grid lines are 4 cm apart. Each square on the map is 4 cm by 4 cm (16 cm2) and represents 1 km2 on the surface of the Earth. In each case, the grid lines enclose one square kilometre.
Medieval city centres , Netherlands, dated 1659. The walls enclosed an area of about 1 square kilometre. The area enclosed by the walls of many European medieval cities were about one square kilometre. These walls are often either still standing or the route they followed is still clearly visible, such as in
Brussels, where the wall has been replaced by a ring road, or in
Frankfurt, where the wall has been replaced by gardens. The approximate area of the old walled cities can often be worked out by fitting the course of the wall to a
rectangle or an oval (
ellipse). Examples include: •
Delft, Netherlands (See map alongside) :The walled city of Delft was approximately rectangular. ::The approximate length of rectangle was about . ::The approximate width of the rectangle was about . • Brierley Forest Park, UK. •
Rio de Los Angeles State Park, California, US • Jones County Central Park, Iowa, US. • Kiest Park, Dallas, Texas, US • Hole-in-the-Wall Park & Campground, Grand Manan Island, Bay of Fundy, New Brunswick, Canada • Downing Provincial Park, British Columbia, Canada • Citadel Park, Poznan, Poland • Sydney Olympic Park, Sydney, Australia, contains 6.63 square kilometres of wetlands and waterways.
Golf courses Using the figures published by golf course architects Crafter and Mogford, a course should have a fairway width of 120 metres and 40 metres clear beyond the hole. Assuming a 18-hole course, an area of 80 hectares (0.8 square kilometre) needs to be allocated for the course itself. • Northop Country Park, Wales, UK • Qingdao International Country Golf Course, Qingdao, Shandong, China • Arabian Ranches Golf Club, Dubai • Sharm el Sheikh Golf Courses: Sharm el Sheikh, South Sinai, Egypt • Belmont Golf Club, Lake Macquarie, NSW, Australia
Other areas of one square kilometre or thereabouts •
The Old City of Jerusalem is almost 1 square kilometre in area. • Milton Science Park, Oxfordshire, UK. • Mielec Industrial Park, Mielec, Poland • The Guildford Campus of Guildford Grammar School, South Guildford, Western Australia • Sardar Vallabhbhai National Institute of Technology (SVNIT), Surat, India • Île aux Cerfs, near the east coast of Mauritius. •
Peng Chau Island, Hong Kong ==See also==