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fix: preserve parent coordinate dtype in overview levels #47

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fix: preserve parent coordinate dtype in overview levels #47

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@wietzesuijker wietzesuijker commented Oct 3, 2025 •
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xarray.DataTree requires aligned coordinates between parent/child groups. When parent (level 0) uses int64 coords and children (level 1+) use float64 (np.linspace default), xarray throws "not aligned" errors, preventing TiTiler from reading multiscale groups.

Solution

Preserve parent coordinate dtype when creating overview coordinates:

parent_x_dtype = ds.coords["x"].dtype if "x" in ds.coords else np.float64
parent_y_dtype = ds.coords["y"].dtype if "y" in ds.coords else np.float64
x_coords = np.linspace(..., dtype=parent_x_dtype))
y_coords = np.linspace(..., dtype=parent_y_dtype))

Impact

  • Fixes "group /measurements/reflectance/r10m/1 is not aligned" error
  • Enables tile rendering at all zoom levels
  • Critical for STAC browser functionality
  • 7 lines, zero dependencies, backwards compatible

d-v-b
d-v-b reviewed Oct 3, 2025
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@wietzesuijker
fix: preserve parent coordinate dtype in overview levels
f1e6303 
TiTiler requires coordinate dtypes to match between parent and child
groups. Previously np.linspace() always returned float64, causing
alignment errors when parent coordinates were int64.

Now reads parent dtype and casts overview coordinates accordingly.

Fixes: group /measurements/reflectance/r10m/1 is not aligned error
@wietzesuijker wietzesuijker force-pushed the fix/overview-coordinate-dtype branch from abc7906 to f1e6303 Compare October 3, 2025 15:01
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@emmanuelmathot emmanuelmathot Awaiting requested review from emmanuelmathot

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@wietzesuijker @d-v-b