By Jonathan C. Iliffe

ISBN-10: 0849308844

ISBN-13: 9780849308840

New tools of buying spatial facts and the arrival of geographic details structures (GIS) for dealing with and manipulating info suggest that we not needs to depend on paper maps from a unmarried resource, yet can collect, mix, and customise spatial info as wanted. to make sure caliber effects, although, one needs to absolutely comprehend the various coordinate frameworks upon which the knowledge are based.

Datums and Map Projections presents transparent, available reasons of the terminology, relationships, adjustments, and computations fascinated with combining facts from diversified assets. the 1st 1/2 the e-book specializes in datums, exploring various coordinate platforms and datums, together with - and 3-dimensional representations of Earth coordinates and vertical datums. After an outline of the worldwide positioning approach (GPS), the writer introduces the basics of map projections and examines the different sorts. He then provides types and systems for remodeling at once among information units. the ultimate bankruptcy offers case stories of tasks that illustrate the kinds of difficulties frequently encountered in practice.

Newcomers to the sector will welcome this therapy that, rather than specific arithmetic, makes use of lucid reasons and diverse examples to resolve the complexities of the topic. For more matured readers, the ebook is a important reference that solutions particular questions and imparts a greater realizing of transformation operations and rules.


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Additional resources for Datums and Map Projections: For Remote Sensing, GIS and Surveying

Sample text

A datum with its origin at the centre of the Earth is said to be geocentric. This is a necessary condition for computations of satellite orbits. Since the advent of satellite geodesy in the early 1960s, there have been several attempts to define a global geocentric datum. The most recent of these is the World Geodetic System 1984 (WGS84). 257223563 as well as further parameters relating to the gravitational field and the rate of rotation. Note that the shape and size of the spheroid thus defined are almost consistent with another commonly used global datum, the Geodetic Reference System 1980 (GRS80), which is mainly used in gravitational applications.

The size of this offset may be as much as 1 km. 2 ------------~ -----------.. / designed to fit here GEOID A local datum and WGS84. (M,L1Y,AZ), where these values are effectively the coordinates of the origin of the local datum in WGS84. 12). Alternatively, it is possible to combine all these steps in one set of equations, such as the Molodensky formulae (Stansell, 1978). These give the changes in geodetic coordinates directly as: - M sin cos A. - L1Y sin sin A. + AZ cos { L1= + L1a[(ve2sin cos cos (p+h)sinA.

The only differences here are that the known points are in orbit, and are not stationary. The determination of the coordinates of these satellites is therefore a continuous process, and is achieved by the control segment of GPS, which consists of a worldwide network of monitoring and control stations dedicated to the task of determining the orbital paths of the satellites and monitoring the health of their signals. It is then possible to predict the orbit of a satellite a short way into the future, and to upload this information to the satellite itself.

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