lecture03 - MapSelection...

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Map Selection Countries of western Europe with a population of more than 50 million inhabitants hematic selection Thematic selection
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Map Union Union of countries of western Europe p with more than (or exactly) 10 million inhabitants and countries of western Europe with less than 10 million habitants inhabitants
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Map Overlay verlay of western European countries and Overlay of western European countries and language areas spoken all over western Europe Map overlay is THE classical GIS operation (spatial Intersection join) Geometric intersection of the regions of the first map with all regions of the second map The regions of the result map get all thematic tributes of both operand maps attributes of both operand maps
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Map Windowing Countries of western Europe intersected by the area (window) A
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Map Clipping Geometric extraction of a sub map Geometric intersection of a map with a rectangle Spatial range query (rectangle = spatial range)
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Map Fusion Thematic attributes of two or more adjacent regions of a map are changed to the same value g p g regions are geometrically merged Common boundaries of adjacent regions disappear
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What is a Spatial Database System?
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A Three Layered Architecture ofaSpatial Database System
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Which spatial information needs to be represented? (I)
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lecture03 - MapSelection...

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