The uint64 problem | The solution: a5_cell_from_arrow() and a5_cell_to_arrow() | Writing and reading Parquet | Storing coverings | Data written by a5R before 1.0 | How it works under the hood

What a covering stores | Building coverings | Measuring coverings | Combining coverings | Testing coverings | Drawing and joining | Storing coverings

Index a point | Cell boundaries | Hierarchy and compaction | Compact and uncompact | Traversal | Converting geometries to a5 cells | Tracing a line | Next steps

The problem | The solution: eight raw-byte fields | R-side: a vctrs record type | Why this matters | NA handling | Working with base R | Coverings | From compiled code | Summary

The index hierarchy is not spatially nested | Aggregating to a coarser grid | Expanding coarse cells | Which to use

Setting the thread count | What gets parallelised | When is it worthwhile? | Other parallel code

Selecting cells around a point | Distance heatmap | Distance methods