envi orthorectification

orthorectify ObViewSubset.dat with reference image and DEM model

toolbox -> geometric correction -> generate GCP from reference image

select image, reference, dem

toolbox -> geometric correction -> orthorectification -> RPC Orthorectification workflow

select DEM file

select generated GCP

turn on error overlay

delete or move the high error GCP

export and overlay the orthorectified imaged on reference

auto orthorectification. toolbox -> RPC using reference -> increase GCP # to 40

orthorectified image contains geo location and height above sea level

reference:

https://www.l3harrisgeospatial.com/docs/rpcorthotutorial.html