Resolving RPC File Errors and Seeking Documentation Guidance of S2P

[silverbean-j]

Hello S2P Team,

I hope this message finds you well. I am currently working with S2P to generate DSM, but I have encountered an issue. I have set up my S2P environment on Ubuntu 20.04 using the information provided in the following link: https://github.com/centreborelli/s2p#installation.

I have a couple of questions I'd like to ask:

First, I am looking for documentation or a website that explains the elements that go into the config.json file for S2P. I'm interested in understanding what I can configure and the details of each element. I have been unable to locate this information, so any guidance in this regard would be greatly appreciated.

Second, I initially created my config.json file following the example provided with your sample data. However, my imagery does not have an rpc.xml file, and when I added one, I encountered the following error.

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/rpcm/rpc_file_readers.py", line 28, in read_rpc_file
    rpc = read_rpc_xml(rpc_content)
  File "/usr/local/lib/python3.8/dist-packages/rpcm/rpc_file_readers.py", line 112, in read_rpc_xml
    raise NotImplementedError()
NotImplementedError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/bin/s2p", line 11, in <module>
    load_entry_point('s2p', 'console_scripts', 's2p')()
  File "/s2p/s2p/cli.py", line 25, in main
    s2p.main(user_cfg, start_from=args.start_from)
  File "/s2p/s2p/__init__.py", line 537, in main
    initialization.build_cfg(user_cfg)
  File "/s2p/s2p/initialization.py", line 112, in build_cfg
    check_parameters(user_cfg)
  File "/s2p/s2p/initialization.py", line 59, in check_parameters
    img['rpcm'] = rpcm.rpc_from_rpc_file(img['rpc'])
  File "/usr/local/lib/python3.8/dist-packages/rpcm/rpc_model.py", line 90, in rpc_from_rpc_file
    return RPCModel(read_rpc_file(rpc_file_path))
  File "/usr/local/lib/python3.8/dist-packages/rpcm/rpc_file_readers.py", line 30, in read_rpc_file
    raise NotImplementedError('XML file {} not supported'.format(rpc_file))
NotImplementedError: XML file /s2p/rpc_01.xml not supported

Is there a specific format or set of rules for creating the rpc.xml file? Could you provide an example or some guidance on this matter?

For your reference, the imagery I am working with is Panchromatic with a GSD of 0.5m, and the dimensions are approximately 25,000 (width) by 17,400 (height) pixels. Below, I've included the config.json file I have created:

{
  "out_dir" : "/data/testoutput/output_pair",
    "images":[
        {
            "img":"img_01.tif",
            "rpc":"rpc_01.xml"
        },
        {
            "img":"img_02.tif",
            "rpc":"rpc_02.xml"
        }
    ],
  "full_img":true,
  "horizontal_margin": 20,
  "vertical_margin": 5,
  "tile_size" : 300,
  "disp_range_method" : "sift",
  "msk_erosion": 0,
  "dsm_resolution": "2.0",
  "3d_filtering_r": 5,
  "3d_filtering_n": 50
}

I am eager to use your software to generate DSM, and your assistance in resolving these issues would be greatly appreciated. Thank you in advance for your help!

Best regards,