By Michael Kennedy
The worldwide Positioning method and Geographical details platforms, operating in tandem, offer a strong software. fresh advancements comparable to the elimination of Selective Availability haven't simply made those applied sciences extra exact yet have additionally spread out a brand new seam of purposes, quite in place established prone. the worldwide Positioning procedure and GIS is a transparent textual content and advisor to the use and integration of those strong applied sciences, with each one subject combining an summary with a step by step process. This considerably revised and prolonged moment variation now comes with a suite of assets on a CD-ROM, together with an instructor's advisor, demonstration information and routines. it's a user-friendly introductory textual content for college kids and lecturers on GIS/GPS classes in addition to a realistic and introductory box handbook for mapping technology execs, giving simple functional tips, quite to the built-in use of ESRI's GIS software program with Trimble's GPS undefined.
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The Global Positioning System and GIS: An Introduction (2nd Edition)
The worldwide Positioning approach and Geographical info structures, operating in tandem, supply a robust device. fresh advancements akin to the removing of Selective Availability haven't simply made those applied sciences extra actual yet have additionally spread out a brand new seam of functions, relatively in situation dependent providers.
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Before we undertake to use a GPS receiver to determine a position, it is important to understand what is meant by that term. 7 Take a tent stake, or a knitting needle, or a table knife and stick it vertically into a patch of ground. Now reflect upon the fact that the object is not moving with respect to the planet,8 as it would be if you stuck it into the soil in a flowerpot on the deck of a ship. The location of the object may be identified through time by three unchanging numbers of latitude, longitude, and altitude.
While the unit is very complex internally, containing not only signal reception electronics, but a microcomputer with a quarter megabyte memory as well, its user controls are quite basic: eight buttons. See Figure 1—3. gov takes you to the web site of the National Geodetic Survey, which is part of the National Oceanic and Atmospheric Administration. , of Sunnyvale, California. BASIC CONCEPTS 19 Figure 1—3. The GeoExplorer II GPS receiver from Trimble Navigation. The Geo3 contains its own batteries.
A more 2 THE GLOBAL POSITIONING SYSTEM AND GIS general, recent acronym for such systems is GNSS, standing for Global Navigation Satellite Systems. In the western world, GPS usually implies NAVSTAR, so I will use the two designations interchangeably in this text. Where Are You? Geography, and Geographic Information Systems (GISs) particularly, depend on the concept of location. Working with “location” seems to imply that we must organize and index space. How do we do that? Formally, we usually delineate geographical space in two dimensions on the Earth’s surface with the latitude-longitude graticule, or with some other system based on that graticule.