geog529_lecture6.ppt
TRANSCRIPT
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: photograph film . ( ) digital image . scanners ( ) . Panchromatic Multi-spectral .
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ERDAS . : . Image Correction . Image Enhancement . Multi-temporal images Change Detection . Image Classification. Pixels .
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raster columns rows . () formats Tagged Image File Format (TIF). ERDAS ( ) ILWIS () IDRISI PCI Geomatica TNTmips . formats import . import
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()Raw data Radiometric distortions Geometric distortions . : radiometric correction () Geometric correction.
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Radiometric distortion. . fidelity radiometric correction. : haze . destripe . . . .
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. Geometric distortion Systematic distortions Random distortions. Geometric correction (rectification) geo-coding. () Resampling Nearest neighbor Bilinear Cubic convolution.
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Geo-referencing grid . registration reference image .
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Ground Control Points.
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( ) GPS.
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Transformation ( ).
polynomial ERDAS Affine ILWIS 4 . 6 .
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() .
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scanner : . Reference points (Tie-points) . Reference points (Tie-points) GPS.
Coordinates Projection ( / ) Ellipsoid or Spheroid Datum
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: . geographical coordinate system ( = 60 = 60 ). grid system plane coordinates or rectangular coordinates (X) (Y). . UTM . ERDAS :http://www.rcn.montana.edu/resources/tools/coordinates.aspxhttp://www.dmap.co.uk/ll2tm.htmhttp://www.oasisphoto.com/navigation/convert_form.phphttp://www.cellspark.com/UTM.htmlhttp://home.hiwaay.net/~taylorc/toolbox/geography/geoutm.html
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projection: () . . . projections . ( ). UTM.
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.
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60 . UTM 36 39 .
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Spheroid / Elipsoid : .
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Datum : Spheroid . : Geocentric Datum (WGS84). Local Horizontal Datums . . ( / ) Ellipsoid or Spheroid Horizontal Datum . Ellipsoid or Spheroid Datum . Ellipsoid Datum .
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Spheroid / Ellipsoid International Datum Ain el Abd 1970 (Saudi Arabia).
Ellipsoid WGS84 .
UTM Spheroid / Ellipsoid ( ) International Datum Ain el Abd 1970 (Saudi Arabia).