isce-framework / isce-framework/isce3

`nisar.h5.h5utils.extractScalar` broken with h5py 3.15.1 and HDF5 2.0.0

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Python
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Description

I was able to successfully build isce3 with HDF5 2.0.0 but it looks like the extractScalar method fails with

TypeError: only 0-dimensional arrays can be converted to Python scalars

In an ipython console, I can confirm that h5py now returns an array of 1 element instead of a scalar.

I also had to explicitly build isce3 using -DCMAKE_POLICY_VERSION_MINIMUM=3.5 as gtest requirements break building isce3 with newer versions of cmake.

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Research direction

Start by locating nisar.h5.h5utils.extractScalar and reproduce the failure with h5py 3.15.1 and HDF5 2.0.0. Confirm that the method successfully extracts the scalar when h5py returns a one-element array, and verify the reported TypeError no longer occurs.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
data
Issue type
Bug
Difficulty
2/5
Estimated time
1-3 hours
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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