Topic12_Raster - GLY3759 Visualizing Your World with GIS...

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1 Topic 11: Raster Analysis GLY3759 Visualizing Your World with GIS Dean Whitman FIU Department of Earth Sciences All Rights Reserved, 2007 Reading: ArcGIS Desktop 9.3 Help http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm Image and raster data management Understanding raster data Extensions Spatial Analyst Getting started with Spatial Analyst Raster Data Model Synonyms: Grids, Images, Lattices World is represented by a regular grid of cells (pixels, rasters) Each layer of raster cells represents an attribute Example formats: – ESRI Grids – Common Image formats: jpeg, tiff (geotiff), gif – Remote sensing image formats (often multilayer) Raster Data Model A raster model is specified by – the numbers of rows and columns in the grid – the size or spatial resolution of the grid cells – the location of the grid origin or registration point – an array of cell values Continuous Raster Layers Topography Satellite Image Distance to Roads Discontinuous Raster Layers Drainage Basins Land Use Zip Codes
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2 Vector Model Raster Model Attribute Table Typical Raster Analysis Functions Available through the Spatial Analysis
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Topic12_Raster - GLY3759 Visualizing Your World with GIS...

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