Showing posts with label map. Show all posts
Showing posts with label map. Show all posts
Wednesday, 7 September 2016
Tuesday, 6 September 2016
Thursday, 4 October 2012
World map on a dodecahedron
Basically, the world is a sphere (the shape of a ball), and a map is a flat surface. It's difficult to take a sphere and attempt to form it into a flat surface, since a sphere is a curved object, and a map is completely flat.
Say for example that you have a globe, and you wanted to wrap it in a sheet of paper. The globe is the Earth, and the sheet of paper is a map of its surface. If you tried it, you would find that it is extremely hard to do this.
Likewise, if you've ever peeled an orange, you've found that you can't lay it on a flat surface without tearing it. This is actually just the opposite problem of gift-wrapping the ball. Here we're trying to take a spherical surface and turn it into something flat.
Likewise, if you've ever peeled an orange, you've found that you can't lay it on a flat surface without tearing it. This is actually just the opposite problem of gift-wrapping the ball. Here we're trying to take a spherical surface and turn it into something flat.
This is also exactly the problem that the mapmaker faces.
There are a dozen different kinds of maps for the Earth, each one using a different pattern or technique. None of them are the "true" map of the Earth, but some come very close.
You can use a dodecahedron to produce a world map. A dodecahedron is a polyhedron with twelve flat faces.
A world map on a dodecahedron is a projection of a world map onto the surface of a dodecahedron, which can be unfolded and flattened to two dimensions.
Sunday, 30 September 2012
The scale of a map
What is scale ?
The scale of a map is the ratio of a distance on the map to the corresponding distance on the ground. Scale is what makes map drawing possible. It takes real life things and reduces them in size many times so they can be shown on a map.
Every map has a scale printed on the front and you should always check this figure before you start reading it. It will tell you how much smaller the area shown on the map is compared to the same area in real life.
A carthographer (the map maker) reduces the scale, he leaves out more and more details.
Carthographers produce different maps for different uses and with different scales.
Map scale 1 : 1250 - (This map scale is ideal for architects).
This means that every one unit of measurement on the map (like a centimetre) is the same as 1250 of those units (in this case 1250 cm or 12,5 metres) in real life.
Map scale 1 : 10,000 - (Ideal for town developers).
This means that every one unit of measurement on the map (like a centimetre) is the same as 10,000 of those units (in this case 100 metres) in real life.
Map scale 1 : 20,000
This means that every one unit of measurement on the map (like a centimetre) is the same as 20,000 of those units (in this case 200 metres) in real life.
Map scale 1 : 25,000 - (This map covers a small sized area. This unit of measurement is useful for surveying, so these maps are generally made for outdoor activities).
This means that every one unit of measurement on the map (like a centimetre) is the same as 25,000 of those units (in this case 250 metres) in real life.
Map scale 1 : 50,000 - (These maps cover a moderately sized area like a national park. So these maps could be used for planning a day out).
This means that every one unit of measurement on the map (like a centimetre) is the same as 50,000 of those units (in this case 500 metres) in real life.
Map scale 1 : 200,000 - (This map covers a large area and is useful for long-range exploration. For example for motorists, and long journeys).
This means that every one unit of measurement on the map (like a centimetre) is the same as 200,000 of those units (in this case 2 kilometres) in real life.
Map scale 1 : 500,000 - (Ideal for seeing the whole country at a glance).
This means that every one unit of measurement on the map (like a centimetre) is the same as 500,000 of those units (in this case 5 kilometres) in real life.
The scale of a map is the ratio of a distance on the map to the corresponding distance on the ground. Scale is what makes map drawing possible. It takes real life things and reduces them in size many times so they can be shown on a map.
Every map has a scale printed on the front and you should always check this figure before you start reading it. It will tell you how much smaller the area shown on the map is compared to the same area in real life.
A carthographer (the map maker) reduces the scale, he leaves out more and more details.
Carthographers produce different maps for different uses and with different scales.
Map scale 1 : 1250 - (This map scale is ideal for architects).
This means that every one unit of measurement on the map (like a centimetre) is the same as 1250 of those units (in this case 1250 cm or 12,5 metres) in real life.
Map scale 1 : 10,000 - (Ideal for town developers).
This means that every one unit of measurement on the map (like a centimetre) is the same as 10,000 of those units (in this case 100 metres) in real life.
Map scale 1 : 20,000
This means that every one unit of measurement on the map (like a centimetre) is the same as 20,000 of those units (in this case 200 metres) in real life.
Map scale 1 : 25,000 - (This map covers a small sized area. This unit of measurement is useful for surveying, so these maps are generally made for outdoor activities).
This means that every one unit of measurement on the map (like a centimetre) is the same as 25,000 of those units (in this case 250 metres) in real life.
Map scale 1 : 50,000 - (These maps cover a moderately sized area like a national park. So these maps could be used for planning a day out).
This means that every one unit of measurement on the map (like a centimetre) is the same as 50,000 of those units (in this case 500 metres) in real life.
Map scale 1 : 200,000 - (This map covers a large area and is useful for long-range exploration. For example for motorists, and long journeys).
This means that every one unit of measurement on the map (like a centimetre) is the same as 200,000 of those units (in this case 2 kilometres) in real life.
Map scale 1 : 500,000 - (Ideal for seeing the whole country at a glance).
This means that every one unit of measurement on the map (like a centimetre) is the same as 500,000 of those units (in this case 5 kilometres) in real life.
Wednesday, 26 September 2012
Maps of the world
The world
Continents of the world
Political map of the world
Physical map of the world
Satellite map of the world
The Netherlands
Political map of the Netherlands
Physical map
Geological map
Satellite map
Europe
Political map
Physical map
Satellite map
Geological map of Europe
Africa
Political map
Physical map
Satellite map
Asia
Political map
Physical map
Satellite map
North America
Political map
Physical map
Satellite map
Central America
Political map
Physical map
Satellite map
South America
Political map
Physical map
Satellite map
Oceania
Political map
Physical map
Satellite map
Arctica
Political map
Physical map
Satellite map
Satellite map
Antarctica
Political map
Physical map
Satellite map
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