geocode.py error

[wenguang0412]

geocode.py swbdLat_N26_N28_Lon_E119_E122.wbd -l geo/geo_geometryRadar.h5 -o waterMask.rdr --geo2radar

When using geocode.py to convert a file from the geographic coordinate system to the radar coordinate system, an error occurred. How can I resolve this issue?

number of processor to be used: 1
resampling software: pyresample
Traceback (most recent call last):
  File "/home/dfzy/mambaforge/envs/InSARenv/bin/geocode.py", line 8, in <module>
    sys.exit(main())
  File "/usr/local/EZINSAR/tools_insar/proc_insar/MintPy/src/mintpy/cli/geocode.py", line 264, in main
    run_geocode(inps)
  File "/usr/local/EZINSAR/tools_insar/proc_insar/MintPy/src/mintpy/geocode.py", line 59, in run_geocode
    res_obj.prepare()
  File "/usr/local/EZINSAR/tools_insar/proc_insar/MintPy/src/mintpy/objects/resample.py", line 169, in prepare
    self.prepare_geometry_definition_geo()
  File "/usr/local/EZINSAR/tools_insar/proc_insar/MintPy/src/mintpy/objects/resample.py", line 667, in prepare_geometry_definition_geo
    raise ValueError('geo2radar with lookup table in geo-coord it NOT supported yet!')
ValueError: geo2radar with lookup table in geo-coord it NOT supported yet!

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Potential solution

The solution to the bug involves implementing the missing functionality for the geo2radar operation using a lookup table in geographic coordinates. This will require developing the logic to handle the transformation from geographic to radar coordinates within the prepare_geometry_definition_geo function in the resample class. If implementing this functionality is not feasible, alternative solutions include improving error messaging to guide users towards supported workflows or suggesting alternative tools that support the desired operation.

What is causing this bug?

The bug is caused by the lack of implementation for the geo2radar operation using a lookup table in geographic coordinates. The prepare_geometry_definition_geo function in the resample class raises a ValueError because this functionality is not supported. The code currently only supports radar2geo operations, and the geo2radar operation is incomplete, leading to the error when users attempt to perform this transformation.

Code

To address the bug, the following steps can be taken:

1. Implement geo2radar Functionality: Develop the logic for handling geo2radar transformations using a lookup table in geographic coordinates within the prepare_geometry_definition_geo function.

# Example code snippet for implementing geo2radar functionality
def prepare_geometry_definition_geo(self):
    if self.operation == 'geo2radar':
        # Implement logic for geo2radar transformation
        # This may involve setting up the lookup table and performing coordinate transformations
        pass
    else:
        # Existing radar2geo logic
        pass

2. Improve Error Messaging: If the implementation is not feasible, enhance the error message to provide more context and suggest alternative workflows.

raise ValueError('geo2radar with lookup table in geo-coord is not supported yet. Please use radar2geo or consult documentation for alternatives.')

How to replicate the bug

To replicate the bug, follow these steps:

1. Ensure you have the necessary environment and dependencies set up, including the MintPy package and pyresample.

2. Run the geocode.py script with the following command:

geocode.py swbdLat_N26_N28_Lon_E119_E122.wbd -l geo/geo_geometryRadar.h5 -o waterMask.rdr --geo2radar

3. The script will raise a ValueError indicating that geo2radar with a lookup table in geographic coordinates is not supported.

Conclusion

The root cause of the bug is the lack of support for geo2radar operations with a lookup table in geographic coordinates. The solution involves either implementing the missing functionality or guiding users towards alternative workflows. Improving error messaging and documentation can also help users understand the limitations and available options.

Click here to create a Pull Request with the proposed solution

Files used for this task:

Changes on src/mintpy/objects/resample.py

The issue reported by the user is related to the geo2radar operation not being supported when using a lookup table in geographic coordinates. The error message is raised in the prepare_geometry_definition_geo function within the resample class in the src/mintpy/objects/resample.py file. Here's a detailed analysis of the relevant code:

Key Points:

1. Function Involved: The error is raised in the prepare_geometry_definition_geo function, which is responsible for setting up the geometry definitions for resampling operations.

2. Error Message: The specific error message is: ValueError: geo2radar with lookup table in geo-coord it NOT supported yet!. This indicates that the functionality for converting geographic coordinates to radar coordinates using a lookup table in geographic coordinates is not implemented.

3. Code Analysis:

   • The function prepare_geometry_definition_geo is designed to handle both radar2geo and geo2radar operations.
   • For geo2radar, the code raises a ValueError indicating that this operation is not supported.
   • The comment in the code suggests that the implementation for geo2radar is incomplete and requires further development.

4. Potential Solutions:

   • Implement Missing Functionality: The most direct solution would be to implement the missing functionality for geo2radar operations. This would involve completing the logic to handle geographic to radar coordinate transformations using the lookup table.
   • Alternative Solutions: If implementing the functionality is not feasible, consider providing a more informative error message or suggesting alternative workflows to the user.

5. Workarounds:

   • If the user can convert their data to a format that supports radar2geo operations, they might bypass this limitation.
   • Alternatively, using different software or tools that support geo2radar transformations could be suggested.

Conclusion:

The root cause of the issue is the lack of support for geo2radar operations with a lookup table in geographic coordinates in the current implementation. Addressing this would require either implementing the missing functionality or guiding the user towards alternative solutions.

Changes on src/mintpy/geocode.py

Analysis of src/mintpy/geocode.py

The geocode.py script is responsible for converting files between geographic and radar coordinate systems. The main function of interest is run_geocode, which handles the geocoding process. Here's a breakdown of the relevant parts:

1. Input Handling: The script takes various inputs, including files, interpolation methods, and other parameters necessary for geocoding.

2. Resample Object Initialization: The script initializes a resample object using the largest input file and prepares it for geocoding. This involves setting up geometry and other parameters.

3. Error Handling: The error reported by the user originates from the prepare_geometry_definition_geo function in the resample object. The error message indicates that the geo2radar operation with a lookup table in geographic coordinates is not supported.

4. Output Handling: The script manages output file creation, including metadata updates and file writing.

Potential Causes of the Bug

• Unsupported Operation: The error message explicitly states that the geo2radar operation with a lookup table in geographic coordinates is not supported. This suggests that the functionality is either not implemented or intentionally disabled.

• Missing Implementation: If the geo2radar functionality is required, it might be necessary to implement the missing feature in the resample object or provide an alternative approach.

Recommendations

1. Clarify Requirements: Confirm whether the geo2radar operation with a geographic lookup table is intended to be supported. If so, it may require development work to implement this feature.

2. Error Messaging: Improve the error message to provide more context or suggest alternative workflows if the operation is not supported.

3. Documentation: Ensure that the limitations of the current implementation are clearly documented to prevent confusion.

4. Explore Alternatives: If implementing the feature is not feasible, consider alternative methods or workflows that achieve the desired result without relying on unsupported operations.

The next step would be to investigate the prepare_geometry_definition_geo function in src/mintpy/objects/resample.py to understand why the operation is not supported and explore potential solutions.

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[yunjunz]

You should use -l inputs/geometryRadar.h5 file instead.