GEO 481 Lecture Notes - Lecture 4: Data Compression, Shapefile, .Dbf

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. shx - the index of the feature geometry. When copying and pasting, we need to copy all the files. Data compression: reducing the file size while maintaining the contained information. Data compression can be lossless or lossy. Lossless: file size is reduced while no information is lost. Lossy: file size is reduced at the cost of information loss. Run length coding: a common data compression method. Record the number of cells with the same value. May increase the data size when little redundancy exists. Purpose: enable fast display of large raster images. Display image with the suitable resolution based on the view extent. Raster and vector are suitable for different applications. Tin uses points and edges to represent continuous fields. Geographic data are stored in computers as binary numbers. Different data formats can be used to store the same data models.

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