Atsiliepimai

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Smart phones, car navigation systems and now driverless cars are based on coordinates and coordinate systems. This book is about why coordinate systems work, and why they sometimes don't work. The previous editions are based on the North American Datum(NAD 83), the horizontal control datum for the United States, Canada, Mexico, and Central America, and the North American Vertical Datum(NAVD 88). By tracking the dynamic nature of the Earth, NGS will provide a new National Spatial Reference System that is semi-dynamic. It will replace NAVD 88 with a GNSS/geoid datum and replace NAD 83 with a geocentric GNSS-based datum. These changes will be explained in the new edition.