June 2017
Beginner
428 pages
10h 2m
English
Content preview from Practical GIS
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WKT and WKB
WKT is short for Well-Known Text, while WKB is the abbreviation of Well-Known Binary. They are the ASCII and binary representations of the same format, mainly used by spatial extensions of (O)RDBMS software (such as PostGIS). They support 2D geometries and introduce some special types besides the simple ones (for example, curve, TIN, surface, and others). We can come across WKT representations of geometries mainly in official PostGIS and QGIS examples, as both like to use it. A WKT representation of a point looks like the following:
POINT (17.80554 46.04865)
The format is rarely used with files (it cannot even represent attributes), however, it is a very common format to communicate geometries to SQL-based software. There are ...
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