GEO 481 Lecture Notes - Lecture 9: Complex Analysis
2 Apr 2019
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Document Summary
Most gis have provided a number of spatial operations that allow us to process vector data. Operations based on a single layer: e. g. dissolve and buffer. Operations based on multiple layers: e. g. clip, merge, intersect, and union. Creating a polygon around a feature (point, line, or polygon) based on a buffer distance. Buffer distance based on an attribute field: different buffer distances for major and minor rivers. Multiple features are combined into one feature. Dissolve countries (small polygons) into states (larger polygons) Allows you to combine multiple layers into one layer. Multiple layers are often in the same theme but covers different geographic areas. E. g. merging the road data of west ny, central ny, and east ny. Breaks down features, and creates new polygons. Output the intersected features of all layers. Union is the complete combination of two sets of features; intersect is the intersection of inputs (only the overlapping parts)
