week9 - URP 4273: Survey of Planning Information Systems,...

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Unformatted text preview: URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Week 9 Cell based GIS Working with rasters Part I URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department topics of the week Spatial Problems Modeling Raster basics Application functions Analysis environment, the mask Spatial Analyst in ArcGIS URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Spatial problems - modeling A model is a representation of reality Raster model Reality Vector model URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Spatial problems - modeling THERE ARE TWO TYPES OF MODELS: Representation models or data models or descriptive models which model objects in reality Process models which simulate relationships and processes URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Raster basics A RASTER (OR GRID) SYSTEM REPRESENTS SPATIAL OBJECTS BY FILLING IN GRID CELLS For example, suppose that our map contains the lines (arcs) and enclosed areas (polygons) as shown below URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Raster basics We can place a grid over these map elements URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Raster basics Map Algebra language provides tools to perform operations Raster features Point data Linear data Polygon data URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Raster basics Raster data: thematic data, image data A raster dataset describes features of an area by theme A raster dataset is made up of cells. Each cell represents a portion of the area in a square. URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department...
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This note was uploaded on 02/15/2012 for the course URP 4273 taught by Professor Papajorgji during the Spring '08 term at University of Florida.

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week9 - URP 4273: Survey of Planning Information Systems,...

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