Vector Representation

Vector Representation - REPRESENTATIONOF REPRESENTATIONOF...

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REPRESENTATION OF  REPRESENTATION OF  VECTOR DATA VECTOR DATA
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REPRESENTATION OF REPRESENTATION OF GEOGRAPHIC DATA GEOGRAPHIC DATA TWO TYPES OF GEOGRAPHIC TWO TYPES OF GEOGRAPHIC DATA DATA 1. RASTER DATA 1. VECTOR DATA HYBRID GIS
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SPATIAL DATA STRUCTURE SPATIAL DATA STRUCTURE Raster model Raster model Raster model) Features
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Polygon (x,y) Point (x,y) Line (x,y) Line (x,y,z) Digital Landscape Model - Objects, (point, line and area) - X,Y,Z, Co-ordinates - Attributes - Without scale PT 1289 1200 Digital Cartographic Model Scale 1:25,000 SPATIAL DATA STRUCTURE SPATIAL DATA STRUCTURE Vector model Vector model
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VECTOR AND RASTER REPRESENTATIONS VECTOR AND RASTER REPRESENTATIONS OF POINTS, LINES AND AREAS OF POINTS, LINES AND AREAS Column Column Column Row Row Vector data model Raster data model Point Line Area y y y x x x code code code Key for the vector models: intermediate point node
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VECTOR REPRESENTATION VECTOR REPRESENTATION OBJECTS/FEATURES CAN BE SHOWN IN THREE FORMS OBJECTS/FEATURES CAN BE SHOWN IN THREE FORMS 1. Points : Location of houses (Single XY coordinates) 2. Lines: Like Roads, Street, River etc (Series of XY coordinates) 3. Polygons: Land use type, forest area, houses etc (Enclosed series of XY Coordinates that define the boundary. 1. Surfaces: Represent the elevation (Contour, DEM) Preparing a map by digitization is converted into vector data into the computer Associate coordinate pairs with the real geographic phenomena. Maps are built up from points, lines and areas. Each defined by a pair of XY coordinates. 1 coordinate pair makes a vector
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POINT REPRESENTATIONS POINT REPRESENTATIONS Represent objects Without shape and size (depending on scale) Single locality Point can contain attribute information (x,y,attribute) or (x,y,z,attribute)
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LINE REPRESENTATIONS LINE REPRESENTATIONS When/how do we use lines? To represent one-dimensional objects Depending on relevance and scale How do we define line? Begin node and end node Zero or more internal nodes (or vertices ) Line segments between nodes and vertices Vertices determine shape of line
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LINE LINE Begin node End node Vertex Line segments Vertex Vertex
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AREA REPRESENTATIONS AREA REPRESENTATIONS AREA OBJECT Polygon as boundary model Same area features as single data layer with non-overlapping polygons Occupied place in the space
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Vector Representation - REPRESENTATIONOF REPRESENTATIONOF...

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