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Use rioxarray to read to chunked dask array, add 'lazy' flags#74

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tomalrussell wants to merge 1 commit intomainfrom
feature/58-large-rasters
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Use rioxarray to read to chunked dask array, add 'lazy' flags#74
tomalrussell wants to merge 1 commit intomainfrom
feature/58-large-rasters

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Aims to close #58

Keeps band-reading API and general assumption of tiffs and 2D data arrays,
but adds rioxarray, dask and xarray as optional dependencies that can handle
lazy reading of chunked data - works well in side experiments with VRT built
from ~100s of TIFFs for global raster layer and national vector layer.

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Allow working with larger-than-memory rasters

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