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Last Post 23 Feb 2016 12:13 PM by  anon
Image Orthorectification Help
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anon



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23 Feb 2016 12:13 PM
    Student, Western Washington University, Bellingham, WARunning: ENVI v5.1, 64bitThis is my first post so I apologize if it lacks sufficient detail. If so, please let me know what else is needed in order to accurately address my query.I am working towards creating a raster mosaic from a subset of images of Padilla Bay in Washington State taken during 1997 and 1998, of which there are 64 and 63 orthos, respectively. My first step is to (ideally) orthorectify the images based on a later mosaic made up of 2004 orthos; however, while I have a strong DEM, I am lacking GCPs and RPCs. I am wondering if it is possible to create GCPs for both subsets of images based on the 2004 mosaic, and what steps I should take to do so. Any help would be greatly appreciated.

    MariM



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    24 Feb 2016 02:39 PM
    Without RPCs you won't be able to use RPC Orthorectification based on the sensor model. You could use the Build RPCs tool to create them if you need that kind of accuracy. This involves entering some camera model information and then selecting GCPs with corresponding DEM values. Once you select your GCPs they are used to calculate RPCs that can be used to Orthorecify the datasets. Assuming the mosaic is already orthorectified or is very precise, you could also get a very good result by registering the Orthos to the Mosaic using the Image Registration workflow or the ENVI Classic tools of Image to Image registration. This can generate some tie points for you automatically. This may be sufficient for your needs.
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