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Rangi Guy wrote:
So skating back to the train station after work today things went wrong.....now my skateboard is at the bottom of the harbour
The shapefile format (promulgated by ESRI) stores non-topological geometry and attribute information for the spatial features in a data set. Shapefiles are used extensively in Geographic Information Systems (GIS) and they typically contain data related to coastlines, political boundaries, state or county boundaries, climate zones, roads, rivers, topography, etc. The geometry of each spatial feature or 'shape' is stored as a set of vector coordinates. Shapes can be points, lines, or polygons (areas). An ESRI shapefile actually consists of several files: a main file (*.shp), an index file (*.shx), a dBASE file (*.dbf), and an optional projection file (*.prj). The main file describes a set of shapes with a list of their vertices. The index file contains offsets pointing to the locations of each shape in the main file. The dBASE file contains attribute data for each shape in the main file. The projection file contains specifics about the spherical geometry; it is an optional but useful component of a shapefile.
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