Showing posts with label cartography. Show all posts
Showing posts with label cartography. Show all posts

2/26/2012

Understanding Map Projections Review

Understanding Map Projections
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This book is hard to rate. Where it is good, it gets a high score, but it cannot be rated 5-star in my opinion because of a serious lack of what I consider important information.
First, the good part. The book is very attractive; most map projection books stick to black and white line drawings illustrating projections and geometric properties, but this book uses color in a very helpful way. It also provides its information in a well-organized manner; each of the projections it describes has a page devoted to it, with an illustration depicting the projection (usually a world map if the projection is well-adapted to that purpose, or a map of Antarctica if the projection is better suited to smaller areas), a list of some of the important properties of the projection, and some information on where it is used.
My strongest negative criticism is related to the fact that the authors seem not to be sure how much mathematics the reader considers comfortable. Thus there are equations giving the transformation of coordinates from one geographic system to another, but not the equations that define the various projections; and I think these equations are really necessary in a book of this type.
The other criticism that I have is that the computer program used to draw the illustrative maps of the projections has too low a resolution, at least in the case of the world maps. (The maps of Antarctica seem all right.) Thus a lot of the lines have the kind of jaggedness that comes from this insufficient resolution.
I suppose "you get what you pay for" as this book is much less expensive than other map projection books, but I'm particularly disappointed because there are so many good things about this book.

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12/30/2011

Flattening the Earth: Two Thousand Years of Map Projections Review

Flattening the Earth: Two Thousand Years of Map Projections
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About two months ago, I reviewed "Understanding Map Projections" by Melita Kennedy and Steve Kopp. While in certain minor ways this book falls short of Kennedy and Kopp's book, it is generally head and shoulders above it. And while it is true that Snyder's book is almost twice the price of Kennedy and Kopp's book, it is worth it. Other books of comparable value cost much more.
The only negative thing I really have to say about Snyder's book is that he tries to do two different things in it. This book is both a history and a survey of map projections, and what is appropriate for a history may not be best for a survey. In particular, it means that Snyder covers the various projections not in a sensible order (grouping similar types together), but chronologically. Projections popularized, say, in the 19th century are all covered in the same section.
I prefer the organization of Kennedy and Kopp's book, and I think the use of color in that book makes for a more attractive book. But my primary rating of a book on map projections is going to be based on three criteria: (1) Does it cover a large variety of different projections? (2) Does it give illustrations of what they look like? and (3) Does it give formulas or other information by which one can actually construct maps on the projections listed? This book ranks much higher than Kennedy and Kopp's on two of these three criteria (the first and last), and does not fall very far short of it on the remnaining one.
Over a hundred projections (actually, close to twice that many) are treated in this book, from familiar ones to novelty projections that never will be used in a serious atlas. And a large proportion of them are illustrated (though not all, and the ones that are do not use color as in the Kennedy & Kopp book) and either have the formulas for plotting them or are described in terms equivalent to giving formulas (By contrast the Kennedy-Kopp book has almost no formulas, and the descriptions do not allow you to produce them).
If you don't want to spend over $50, this is the one map projection book to buy.

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As long as there have been maps, cartographers have grappled with the impossibility of portraying the earth in two dimensions. To solve this problem mapmakers have created hundreds of map projections, mathematical methods for drawing the round earth on a flat surface. Yet of the hundreds of existing projections, and the infinite number that are theoretically possible, none is perfectly accurate. Flattening the Earth is the first detailed history of map projections since 1863. John P. Snyder discusses and illustrates the hundreds of known projections created from 500 B.C. to the present, emphasizing developments since the Renaissance and closing with a look at the variety of projections made possible by computers. The book contains 170 illustrations, including outline maps from original sources and modern computerized reconstructions. Though the text is not mathematically based, a few equations are included to permit the more technical reader to plot some projections. Tables summarize the features of nearly two hundred different projections and list those used in nineteenth-and twentieth-century atlases. "This book is unique and significant: a thorough, well-organized, and insightful history of map projections. Snyder is the world's foremost authority on the subject and a significant innovator in his own right."—Mark Monmonier, author of How to Lie with Maps and Mapping It Out: Expository Cartography for the Humanities and Social Sciences.

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12/03/2011

Star Maps: History, Artistry, and Cartography (Springer Praxis Books / Popular Astronomy) Review

Star Maps: History, Artistry, and Cartography (Springer Praxis Books / Popular Astronomy)
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Nick Kanas's Star Maps is perhaps the most comprehensive book on astronomical cartography to be published in the last 50 years. It is an inch-thick mass of well-illustrated information and is worth its weight in gold just for the mini-biographies of astronomers spanning three millenia and four continents. Its content belies its very modest price. Star Maps will likely become the standard reference on astronomical cartography for many years to come.
Kevin J Kilburn FRAS.
Secretary, the Society for the History of Astronomy

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From 1600 to 1800 a number of beautiful star atlases depicting the constellations according to ancient myths and tales were printed. In Europe, where the quality of celestial atlases was unmatched, classical Greek traditions prevailed and the constellations were given allegorical visual representations of heroes and heroines, real and imaginary animals, scientific instruments and artistic tools. These images were placed in celestial latitude and longitude coordinate systems that allowed the positions of the stars to be mapped in the sky and formed the backdrop for predictions of the location of the planets and other heavenly bodies throughout the year. These celestial atlases also contained diagrams of the solar system that reflected both contemporary and ancient cosmological systems, thus tracing the development of man\'s view of his place in the universe.With the construction of the International Space Station, and with new plans for manned missions to the Moon, Mars and beyond, there is renewed interest in the heavens. An ever-increasing number of people are fascinated with the science of space and are becoming amateur astronomers. Antiquarian map societies are prospering, and celestial maps are now viewed as a specialty of map collecting. At the same time, the beauty and awe generated by the celestial void captures our imagination and delights our aesthetic sense.This book traces the history of celestial cartography and relates this history to the changing ideas of man\'s place in the universe and to advances in map-making. Photographs from actual antiquarian celestial atlases and prints, many previously unpublished, enrich the text, and a legend accompanies each illustration to explain its astronomical and cartographic features. Also included in the book are discussions of non-European celestial maps and chapters on early American influences and celestial map-collecting.

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11/25/2011

Maps and Globes (Reading Rainbow Book) Review

Maps and Globes (Reading Rainbow Book)
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Colorful, fun way to introduce Map and Globe reading and understanding. It covers the history of maps, and uses. Advanced concepts like debth and elevatons are discussed. It looks at different uses maps have, and leaves the student wanting to discover more on their own. A very usful tool in teaching basic geography.

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Maps and globes can take you anywhere -- to the top of the tallest mountain on earth or the bottom of the deepest ocean. Maps tell you about the world: where various countries are located, where the jungles and deserts are, even how to find your way around your own hometown. If you take a fancy to any place on earth, you can go there today and still be home in time for dinner. So open a map, spin a globe. The wide world awaits you.

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7/03/2011

Raymarine E32042 Raystar 125 GPS Sensor Review

Raymarine E32042 Raystar 125 GPS Sensor
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My original GPS antenna stopped working because of broken wires. I checked with Raymarine and discovered they have a flat rate charge of $800 to diagnose and fix any of their electronics. I ordered this new unit, attached it and was up and running immediately. Buying a new unit was definitely the less expensive route to go.
The new unit arrived in a few days and I was very satisfied.


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The Raymarine E32042 Raystar 125 GPS Sensor is a 12-channel satellite differential GPS sensor designed to be used with Raymarine's A-series GPS chartplotters, as well as Raymarine's C-series and E-series multifunctional displays. This durable GPS sensor can be pole, surface, or rail mounted so it is able to work with virtually any required boat configuration.
Compact and accurate the Raystar 125 Satellite Differential GPS Receiver provides pinpoint accuracy to Raymarine's C-Series and E-Series Multifunction displays. The Raystar 125 outputs either SeaTalk or NMEA 0183, and is fully compatible with Raymarine SeaTalk instruments and autopilots. A self contained waterproof GPS receiver and antenna combined, the Raystar 125 delivers accuracy better than three meters by decoding GPS correction signals terrestrially from the WAAS (Wide Area Augmentation System) network.

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