Add NDWI and MNDWI water indices#959
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Add ndwi() and mndwi() to the multispectral module for mapping surface water bodies. Both reuse the existing normalized-ratio backend functions, so all four backends (NumPy, Dask, CuPy, Dask+CuPy) work out of the box. Includes DataArray/Dataset accessor methods and tests against reference values.
- Add API reference entries in multispectral.rst - Add two rows to the README feature matrix - Add notebook 17_Water_Indices.ipynb with synthetic data demo
Number 17 is taken by another in-flight branch.
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Summary
ndwi(green, nir)andmndwi(green, swir)toxrspatial/multispectral.pyfor mapping surface water_normalized_ratio_*backend functions, so NumPy, Dask, CuPy, and Dask+CuPy work with no new kernel code.xrsaccessor methods (DataArray and Dataset) for both functionsdocs/source/reference/multispectral.rst17_Water_Indices.ipynbTest plan
pytest xrspatial/tests/test_multispectral.py-- 111 pass (12 new)pytest xrspatial/tests/test_accessor.py-- 21 passCloses #948