Fix polygon_clip: pass dask chunks to rasterize for lazy mask (#1207)#1209
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brendancol merged 1 commit intomasterfrom Apr 16, 2026
Merged
Fix polygon_clip: pass dask chunks to rasterize for lazy mask (#1207)#1209brendancol merged 1 commit intomasterfrom
brendancol merged 1 commit intomasterfrom
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clip_polygon() was calling rasterize() without chunks=, so the polygon mask was always built as a full numpy array even for dask-backed inputs. For large rasters this defeats chunked evaluation and OOMs. Now extracts chunk sizes from the input raster and passes them through so rasterize uses its _run_dask_numpy path. Also sets use_cuda=True for dask+cupy inputs.
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Summary
Fixes #1207.
clip_polygon()calledrasterize()without passingchunks, so the polygon mask was always built as a full numpy array even for dask-backed inputs. For large rasters this materializes the entire mask in RAM, defeating chunked evaluation.Now extracts chunk sizes from the input raster and passes them to
rasterize()so it uses its_run_dask_numpypath. Also setsuse_cuda=Truefor dask+cupy inputs.Two-line fix in the call site, no changes to rasterize itself.
Test plan