Archive for October, 2008

How to get travel maps

Tuesday, October 21st, 2008

If you are thrifty, you can get travel maps for free.

  • The information center of state or city will provide a free map. These are usually located at the border of the state
  • Go to the state tourism website and sign up for an information package about the state. They will send the brochures and maps by mail, which may take a few weeks

Alternately you can purchase an atlas, second hand atlases cost less than $10

National Geographic - PC CD Rom Offer

Sunday, October 19th, 2008

National Geographic - PC CD Rom Offer

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Price:  Rs. 950/- Including Delivery Charges. Delivery by VPP (All India).

Distortions in maps

Wednesday, October 1st, 2008

Maps are a projection on a 2 dimensional flat surface of a 3 dimensional sphere, the earth . At best they are an approximation to help understand the relative positions of the various continents and oceans. There are always some distortions of conformality, distance, direction, scale, and area during this process. While it may be possible to minimize distortions in the projections for some of the properties,  the errors in other properties may be increased. Other map projections will try to minimize distortion of all of these properties to an equal extent.

Conformality
A projection is considered to be conformal,if the scale of a map at any point on the map is uniform in any direction . Meridians (lines of longitude) and parallels (lines of latitude) intersect at right angles on these maps. Shape is preserved on conformal maps locally .

Scale
Scale of a map is the ratio of the distance portrayed on a map and the same distance on the Earth.

Area
When the areas on a map over the entire map are shown so that all mapped areas have the same proportional relationship to the actual area on the surface of the Earth that they represent, the map is an equal-area map.
Different map projections can show different spatial relationships between regions, as hilly  regions may not be correctly drawn.


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