ENVI Tutorial

E N V I T u t o r i a l :O r t h o r e c t i f y i n g A e r i a lP h o t o g r a p h sO r t h o r e c t i f y i n g A e r i a l P h o t o g r a p h s 2B a c k g r o u n d 3B u i l d R P C s 4B u i l d I n t e r i o r O r i e n t a t i o n 5B u i l d E x t e r i o r O r i e n t a t i o n 6C o m p u t e R P C s 9O r t h o r e c t i f y t h e A e r i a l P h o t o g r a p h 1 0S e l e c t a D E M 1 0N o t e s A b o u t R e s a m p l i n g 1 11E N V I T u t o r i a l : O r t h o r e ct i f yi n g A e r i a l P h o t o g r a p h sO r t h o r e c t i f y i n g A e r i a l P h o t o g r a p h sThis tutorial gives you a working knowledge of ENVI’s orthorectification capabilities for aerialphotographs but (because of the size of the required datasets) does not use any hands-on exercises. Nodata files are required. You should be able to produce similar results with your own scanned aerialphotographs following the procedures outlined.The figure below shows an original aerial photograph for Boulder, Colorado.2E N V I T u t o r i a l : O r t h o r e ct i f yi n g A e r i a l P h o t o g r a p h sB a c k g r o u n dOrthorectification is the process of removing the distortion within an image caused by terrain relief andthe camera. This is done by modeling the nature and magnitude of geometric distortions in the imagery.Camera or satellite models in conjunction with limited ground control, allow construction of correctionformulae that produce accurate, ...