Remote Sensing & GIS Applications: Lesson 18 Data Models

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Fields: continuous phenomena such as elevation, temperature and soil chemistry, they exists everywhere (every point has an elevation or temperature), they are not discrete entities. Vector: Objects are represented as geometric entities, including points, spaghetti lines, arc/node lines, networked lines with directionally, whole polygons, and topological polygons. Continuous fields may be also represented by vector such as triangular irregular network (TINs). Object oriented: Real-world objects are used as basis for abstraction, instead of geometric objects such as points lines and polygons. Vector spatial data files are ones in which the geographic features being represented are built by a collection of vertices and lines. Raster spatial data files are ones in which the geographic features across an entire area are represented by a continuous set of “pixels” or “cells”. Continuous data, representing phenomena such as temperature, elevation or spectral data such as satellite images and aerial photographs Jian, Guo Liu, Philippa, J. Mason, Essential Image Processing and GIS for Remote Sensing, John Wiley & Sons, Ltd (2009), 141-143 Source. Here you can find a full bse of Vector Maps of England in Adobe Illustrator.”

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