Terra > 1.9.1 enables more efficient aggregation tables

[njhenry]

terra v.1.9.1, released on March 6, 2026, included a bugfix for terra::extract(SpatVector, SpatRaster, fun = 'table', weights = FALSE) (changelog).

The build_aggregation_table() function was using a workaround for this terra::extract() bug and can now rely on the fixed function to create a pixel-to-polygon aggregation table directly. This fix also specifies terra >= 1.9.1 as a package dependency (see the DESCRIPTION file).

This PR resolves issue #3, as the build_aggregation_table() function will work with terra >= 1.9 moving forward.

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Note

Medium Risk
Changes core aggregation-table generation logic and now depends on specific terra behavior; results/performance should be validated across representative polygon/raster inputs.

Overview
Updates the package to v1.1.1 and requires terra (>= 1.9.1).

Reworks build_aggregation_table() to build pixel-to-polygon area-fraction tables via a single terra::extract(..., fun='table', exact=TRUE, ID=TRUE) call instead of per-polygon cropping/masking and the calculate_pixel_fractions_single_polygon() helper (which is removed along with its export/man page). Adds a small verbose message when polygons are dropped by cropping to the raster extent.

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