Change Detection

Detect change between two rasters by computing pixel-wise difference. Supports simple difference, normalized difference, and threshold classification. Optional patch filtering removes isolated changed pixels.

ID	raster_change_detection
Domain	geo
Category	analysis
Type	raster-raster-to-raster
Version	1.0.0

view yaml ◦view github ◦

Parameters

method: string · default difference · Detection method. "difference" computes current - baseline (continuous). "normalized_difference" computes (current - baseline) / (current + baseline). "threshold_classification" classifies change into loss (-1), stable (0), gain (1).
threshold: number · default 0 · Threshold for classification. For threshold_classification, pixels with diff < -abs(threshold) are loss, diff > abs(threshold) are gain. For difference with min_patch_pixels, defines what counts as "changed".
min_patch_pixels: integer · default 0 · Minimum connected patch size in pixels. Patches of changed pixels smaller than this value are removed. Set to 0 to disable filtering. Requires scipy for connected component analysis.