1introdigital%imagePowerpnts

1introdigital%imagePowerpnts - By: Dr. Charles Roberts...

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By: Dr. Charles Roberts Presentation designed by: Rachel Williams
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Three Broad Areas of Digital Image Analysis ¾ Image enhancement (expert knowledge interpretation) ¾ Image classification (spectral signature classification) ¾ Time series analysis (Raster GIS systems analysis) ¾ Digital enhancement occurs in two phases.
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Image Enhancement ¾ Geovisualization ¾ Image exploration ¾ Explore what is on screen ¾ Enhance: pull out details that are not readily visible ¾ Image Exploration is A Form of Scientific Visualization ¾ Viewer explores image ¾ looking and interpreting the unknown ¾ Not cartography: presents known info to a viewer ¾ Viewer explores unknown relationships ¾ Cartographic generalization ¾ Expert image interpretation ¾ Reduce information to what is necessary ¾ Present to viewer generalized image
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Digital Image Classification ¾ Classify scene into information categories or classes ¾ Land use from land cover ¾ Point classifiers compare ¾ Spectral curve of raster cell ¾ Spectral curves of information classes ¾ Textural and Contextural classifiers ¾ Consider surrounding rasters ¾ Take into account color, pattern, texture, and context
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Time Series Analysis ¾ Map patterns of change between dates ¾ Change detection (large scale, small area, two dates) ¾ Time series (regional, continental or global, multiple dates)
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Image Processing Softwares Erdas Imagine Most common high-end system Leica LPS Separate Imagine Module Image Analyst ESRI plugin made by ERDAS ESRI ArcGIS, ArcCatalog, Arc9 PCI Easy Pace DRAGON IDRISI World’s most common system ENVI Good for IDL programmers Definiens/ Ecognition Advanced image processing Object oriented
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Graphic Softwares Primarily Raster Primary Vector with
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1introdigital%imagePowerpnts - By: Dr. Charles Roberts...

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