Add patch_area_min filter and CRS check to dft_rast_transition()#20
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NewGraphEnvironment merged 3 commits intomainfrom Apr 1, 2026
Merged
Add patch_area_min filter and CRS check to dft_rast_transition()#20NewGraphEnvironment merged 3 commits intomainfrom
NewGraphEnvironment merged 3 commits intomainfrom
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Internal helper that errors when a raster uses geographic CRS (degrees), since area calculations via prod(terra::res()) assume metre units. Wired into dft_rast_summarize(). Also called from dft_rast_transition() (next commit). 7 new tests. Fixes #15 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
New parameter removes connected patches of changed pixels smaller than a threshold (m²) using 8-connected terra::patches(). Filters classification noise from field-forest edges, seasonal canopy variation, and channel migration artifacts. Default NULL preserves current behavior. Also wires dft_check_crs() into both r_from and r_to inputs. Returns $removed SpatRaster of filtered-out transitions for visual QA (NULL when no filtering applied). 23 new tests. Fixes #14 Fixes #17 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Replace broken bookdown @ref() cross-references with natural language. Add Filtering Classification Noise section demonstrating patch_area_min with comparison table and 3-panel figure (unfiltered / removed / filtered). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
patch_area_minparameter todft_rast_transition(): removes connected patches of changed pixels smaller than a threshold (m²) using 8-connectedterra::patches()$removedelement to return list: factor SpatRaster of filtered-out transitions for visual QAdft_check_crs()internal helper: errors on geographic CRS input, wired intodft_rast_transition()anddft_rast_summarize()\@ref()cross-references, add filtering section with comparison table and 3-panel figureFixes #14
Fixes #15
Fixes #17
Relates to NewGraphEnvironment/sred-2025-2026#16
Test plan
devtools::test()— 166 pass, 0 fail (30 new)🤖 Generated with Claude Code