2Unit2%20CorrectionsPowerpnts

2Unit2%20CorrectionsPowerpnts - Digital Image Analysis...

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Digital Image Analysis Project Design Considerations • Designing a project • Image preprocessing Æ Radimetric corrections Æ Geometric corrections
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Designing a Project • Identify goals • Formulate hypothesis • Choose a GIS system • Data acquisition • Feature extraction • Image enhancement • Image classification • Accuracy assessment
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Advantages of Digital Image Analysis •Cos t • Imagery as poor person’s database Æ Maps are secondary sources ± Generalized by who for what? Æ Imagery is raw, primary source information ± Image exploration is scientific visualization or
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Advantages of Digital Image Analysis • Consistent results Æ 1+1=2 Æ 1+1=2, try it Æ Every time it is the same
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Advantages of Digital Image Analysis •T ime Æ Approaches real time Æ Vast areas imaged daily Æ Multitude of satellites Æ
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Advantages of Digital Image Analysis • Spectral characteristics • Statistical analysis: Comparability • Compatibility
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Disadvantages • Spatial Resolution and Scale •Cos t • Accuracy • Non-standard file formats • Preprocessing Æ Radiometric corrections Æ
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Digital Image Analysis Techniques • Image Enhancement • Image classification • Change detection
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Theory and Problem of Machine Interpretation vs. Human interpretation • Computers read a string of numbers Æ BVs and spectral signatures one raster at a time Æ Point classifiers ± Non-vegetation ± Grass ± Trees ± water
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Theory and Problem of Machine Interpretation vs. Human Interpretation • Cannot see: Æ Pattern Æ Texture Æ Context
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Image Preprocessing • Radiometric corrections • Geometric corrections
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Radiometric Corrections • Detector response error • BV missing line= (BV previous line+ BV subsequent line)
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Striping or Banding • Assume any array of six sensors • Sensor #6 is out of calibration • Lines 5, 10, 15, 20, etc. are bad Bad Line
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2Unit2%20CorrectionsPowerpnts - Digital Image Analysis...

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