May 2002
Beginner to intermediate
448 pages
13h 18m
English
Content preview from Geographic Information Systems: An Introduction, 3rd Edition
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11.4 Data Storage Precision
Data storage of both geometry and attributes can also affect data accuracy whenever entries comprise many significant figures. Storage with floating point single precision, in which a single computer word (string of bits) is used to represent a number, results in precision to seven significant figures. Storage with double precision, in which double the usual number of bits are used to represent a number, results in precision of up to 15 significant figures. If data are transferred from a single-precision system to a double-precision system, digits after the sixth or seventh are unreliable. Single-precision systems may also introduce noticeable errors in rounding off when decimal numbers are repeatedly multiplied, as, for example, when computing nodes.
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