How to rebuild RPC file after image clipping?

[Anna D.]

Hello,
I am pretty new (and nube :) ) in ASP. Please, guide me with my question:

I have a large-covering stereo images (Earth data, SPOT 7 exactly) with an associated RPC file as *.xml . I would like to make a DEM for a smaller region than the images actually cover. How can I clip the images and rebuild the associated RPC?
I found the clipping option in <mapproject> tool , but the <parallel_stereo> tool finished with an error "RPCModel: GDAL resource appears not to have RPC metadata." (   I do no specify RPC_*.xml file as it stays for a big source images)

Thanks, A.

[Alexandrov, Oleg (ARC-TI)[KBR Wyle Services, LLC]]

> I am pretty new (and nube :) ) in ASP. 

Nube today, expert tomorrow. 🙂

You don't need to rebuild the RPC, the original RPC will work by making adjustments to the images. One approach is to invoke stereo_gui with the same options as you'd like to do stereo with, select regions with the mouse, and run parallel_stereo from the GUI (https://stereopipeline.readthedocs.io/en/latest/tools/stereo_gui.html). (Note that I just found that the GUI got broken within the last weeks and put a fix, which will be up tomorrow, but the official 3.0.0 version should work in the meantime). 

A second option, if you have a DEM of the area you care for (which can be further cropped as stated here: https://stereopipeline.readthedocs.io/en/latest/tools/stereo_gui.html#finding-pixel-values-and-region-bounds), the left and right images can be mapprojected onto that DEM and stereo run with obtained mapprojected clips, original cameras, and that initial DEM clip, as stated here: https://stereopipeline.readthedocs.io/en/latest/next_steps.html#running-stereo-with-mapprojected-images).

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From: 'Anna D.' via Ames Stereo Pipeline Support <ames-stereo-pi...@googlegroups.com>
Sent: Tuesday, April 12, 2022 1:19 AM
To: Ames Stereo Pipeline Support <ames-stereo-pi...@googlegroups.com>
Subject: [EXTERNAL] How to rebuild RPC file after image clipping?

 

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[Anna D.]

Thanks a lot! 

The second solution (crop and run parallel_stereo with the source PRC) managed my problem.

The first-one didn't work properly, parallel_stereo raised an error a bit after the start. Perhaps because there is no "-t rps" option when launching stereo_gui which seems important for my case. 

PS My special thanks to the authors for automatic identification of already-done jobs when the processing is restarted after a system crash 💗 

вторник, 12 апреля 2022 г. в 18:59:51 UTC+3, oleg.al...@nasa.gov:

[Alexandrov, Oleg (ARC-TI)[KBR Wyle Services, LLC]]

Glad the mapprojection worked when it comes to running small clips. That is a good approach if your underlying DEM is reasonably well-registered with the images you use. 

The -t rpc option can be passed to stereo_gui (and the gui silently accepts all other parallel_stereo options as of recently) which will then passed on to parallel_stereo if invoked from the gui later. And my fix to the gui made it to the latest build at https://github.com/NeoGeographyToolkit/StereoPipeline/releases (not that you need any of this for now). 

> My special thanks to the authors for automatic identification of already-done jobs when the processing is restarted after a system crash 

That was a user-requested feature and I am glad it is of use. 

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From: 'Anna D.' via Ames Stereo Pipeline Support <ames-stereo-pi...@googlegroups.com>

Sent: Tuesday, April 12, 2022 11:45 PM

To: Ames Stereo Pipeline Support <ames-stereo-pi...@googlegroups.com>

Subject: Re: [EXTERNAL] How to rebuild RPC file after image clipping?

 

To view this discussion on the web visit https://groups.google.com/d/msgid/ames-stereo-pipeline-support/dbccf09c-29be-499f-b57d-74341448653dn%40googlegroups.com.