EAS221 Lecture Notes - Lecture 2: Ephemeris, Spatial Analysis, Map Projection
12 Feb 2020
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Document Summary
Image corrections geometric introduction imageryfrom airborneispaceborne sensors contains undesirable geometric errors sources of distortion : curvature of earth. Variations in satellite orbital parameters (velocity ,altitude , altitude) topography of the surface geometric distortion : rotation (alignment) ,projection ,resolution , "correction of errors : hehder uses ephemeris of the platform (exact location ofplatform atanytime distortion characteristics . That still leaves you in image coordinates mosaicking,skewness . " allowing overlay with datafrom other sources (images arenot in a map projection) " allowingtemporal studies or area into comparison between images creation of basemaps for cartography. " identification of unique image features relative to known points. How;by matchingcoordinates of features on image and map cup"s) or using gps coordinates. Geocorrection geocodding : geographical referencing of imagery (ex. image to imageimap) georectification :specificallyrefers to assigning map coordinates to image pixels . i. e . Iatlongand utm this is the onlystep necessary if rectifying datathat has already undergone some planar - transform.
