feat: scaffold spatialbench-raster crate with scaling, footprint grid, and topology#98
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feat: scaffold spatialbench-raster crate with scaling, footprint grid, and topology#98prantogg wants to merge 2 commits into
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…print grid, and topology Add the spatialbench-raster crate to the workspace with three modules: - scaling: SF→(A, N, M, T) lookup table with invariant enforcement - footprint: UTM-based tessellation of S. North America into fixed-metric (109.8km × 109.8km) tiles with per-footprint CRS and WGS84 bbox - topology: Narrow/Balanced/Wide enum and scene assignment logic Footprint generation uses proper UTM forward/inverse projection (WGS84 ellipsoid) to produce realistic tiles matching Sentinel-2/Landsat tiling conventions. Each footprint carries its UTM EPSG code and origin.
- Extract WGS84 constants to module-level consts (avoid per-call recomputation) - Pre-allocate Vec with capacity for expected footprint count - Determine hemisphere per-footprint from center latitude (not from affine edge) - Add Snyder 1987 citation for UTM series expansion algorithm - Adjust SF=1 footprint count from 1,650 to 1,320 to match actual UTM tessellation
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Summary
Adds the
spatialbench-rastercrate — the data model foundation for the raster benchmark (ENGP-263).Three modules:
Part of the phased raster benchmark implementation. Next: COG writer (PR 2).