Entries from December 2007 ↓

What is an Atlas?


The earliest atlases were not called by that name at the time of their publication, as it was introduced in 1595 by [tag]Mercator[/tag].

The first book that in hindsight could be called an atlas was constructed from the calculations of Claudius Ptolemy, a geographer working in Alexandria circa A.D. 150. The [tag]first edition[/tag] was published in Bologna in 1477 and was illustrated with a set of 27 maps, though scholars say that it is not known whether the printed maps were engraved versions of original maps made by Ptolemy, or whether they were constructed by medieval Greek scholars from [tag]Ptolemy[/tag]’s text.

From about 1544, many maps were produced, especially in the important trading centers of Rome and Venice. Each publisher worked independently, producing maps based upon their own needs. The maps often varied dramatically in size. Over time, it became common to bind the maps together into composite works. Although the term atlas was not in use in 1544, these works are now called “IATO” atlases - (Italian, Assembled to Order) or more frequently “Lafreri atlases” after one of the leading publishers of the period.

Abraham Ortelius is credited with issuing the first modern atlas on May 20, 1570. His Theatrum Orbis Terrarum, contained 53 map-sheets covering the countries of the World. This work was the first book of its kind to reduce the best available maps to a uniform size. It was an immediate critical and commercial success.

However, use of the word “atlas” for a bound collection of maps was not to come into use until the 1595 publication of Gerardus Mercator’s “Atlas, Sive Cosmographicae Meditationes De Fabrica Mundi …” (Atlas, or Description of the Universe) (Duisburg, 1585-1595).

“Atlas” etymology

The origin of the term atlas is a common source of misconception, perhaps because two different mythical figures named ‘Atlas’ are associated with mapmaking.

  • King Atlas, a mythical King of Mauretania, was, according to legend, a wise philosopher, mathematician and astronomer who supposedly made the first celestial globe. It was this Atlas that Mercator was referring to when he first used the name ‘Atlas’, and he included a depiction of the King on the title-page.
  • However, the more widely known Atlas is a figure from Greek mythology. He is the son of the Titan Iapetus and Clymene (or Asia), and brother of Prometheus. Atlas was punished by Zeus and made to bear the weight of the heavens on his back. One of Heracles’s labours was to collect the apples of the Hesperides. Heracles went to Atlas and reasoned with him. Eventually, Atlas agreed to collect the apples, and Heracles was left to carry the weight. Atlas tried to leave Heracles there, but Heracles tricked him and Atlas was left to carry the heavens forever. In his epic Odyssey, Homer refers to this Atlas as “one who knows the depths of the whole sea, and keeps the tall pillars who hold heaven and earth asunder”.

In works of art, this Atlas is represented as carrying the heavens or the Celestial Sphere, on his shoulders. The earliest such depiction is the Farnese Atlas, now housed at the Museo Archeologico Nazionale Napoli in Naples, Italy. This figure is frequently found on the cover or title-pages of atlases. This is particularly true of atlases published by Dutch publishers during the second half of the seventeenth century. The image became associated with Dutch merchants, and a statue of this figure adorns the front of the World Trade Center in Amsterdam.

The first publisher to associate the Titan Atlas with a group of maps was Lafreri, on the title-page to “Tavole Moderne Di Geografia De La Maggior Parte Del Mondo Di Diversi Autori …”. However, he did not use the word “atlas” in the title of his work.

Get your geographer a GPS system for Christmas

Only a few shopping days left before christmas to get that GPS unit for your car or [tag]geocaching[/tag]. Here are some of the best which can shipped in time to make your holiday’s perfect. Below is not only a list of GPS solutions, but an overview on how to choose:

How to Choose a GPS?

In order to guide you on how to choose a GPS, we will start with the various categories available. This guide applies to consumer users - GPS is utilized for commercial applications as well as consumer needs, and because those commercial uses can get quite specialized we do not address them here.

Basic [tag]handheld GPS[/tag] receivers - These are going to be the least expensive choices for GPS - often less than $100 US. Basic receivers are as accurate as more expensive units, they just don’t have as many features. The main feature they lack is mapping capability. Here is a list of what most basic receivers display/have:

  • Location, usually in the format of your choice.
  • Compass heading.
  • Elevation above sea level, although elevation accuracy is not as good as position accuracy.
  • Satellite location and signal strength.
  • The ability to calculate [tag]distance traveled[/tag].
  • The ability to record your path as a set of [tag]waypoints[/tag].
  • The ability to navigate routes.
  • The ability to retrace your steps.

Handheld mapping GPS receivers - These units display pre-loaded maps and/or maps uploaded from a PC. Map detail is reflected by the size and resolution of the screen. This means that mapping units are generally larger than basic units. Although mapping units are more expensive than basic units, the increase in cost is not all that much.

Automotive - These are larger than handhelds in order to accommodate a screen large enough to be seen while driving. They are powered by the car’s electrical system and because of this, they can only be used in a vehicle. Automotive units usually have voice instructions to allow you to navigate without taking your eyes off the road.