NAPP Photo Five Pockets near Dubois. Google Earth. Geometric Corrections. Rectification and Registration. What is Geometric Correction?. Any process that changes the spatial characteristics of pixels. Pixel coordinates (e.g., map projection) Pixel relationship with other pixels
Five Pockets near Dubois
Rectification and Registration
Both techniques are based on same concept.
Image Coordinate Frame (row/column)
Real World Coordinate Frame (e.g., UTM)
Google Earth – Seminoe Reservoir (Wyoming). Where would you locate GCPs?
Result of erroneous GCP coordinates or placement.
Real World Coordinates
Points = GCPs; Line = best linear (1st order) fit
(No spatial relationship to location on earth)
(Matches real-world coordinates; Oriented to north, etc.)
Nearest Neighbor Resampling
Cubic Convolution Resampling