Glossary


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UTM
Universal Transverse Mercator, one of the most popular cylindrical map projection, subdivided into 60 zones with a width of six degrees in longitude. UTM is widely used for topographic map of 1:25,000 or 1:50,000.

 

Vectorization
Conversion from raster to vector data, sometimes called raster vector conversion.

Vector model
A model to represent spatial objects with points, lines and/or areas corresponding to the attributes. Vector model has advantages of precise expression, less data volume, full topology, fast retrieval and fast conversion.

 

Window Operator
A matrix operator to execute the convolution. The most popular window operator is 3 x 3 matrix, including Sobel, Laplacian, Mean, Median, High-pass and Sharpening filters.


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