Open Vocabulary Temporal Change Retrieval

Describe a land-cover change in plain language — the semantic change search engine finds the satellite image pairs (and the timestep) where it happened. Research demo — results are approximate (see About below).

Change query

Describe the land-cover change you are looking for. Specific transitions (e.g. 'forest cleared to bare soil') work best.

Approach

How each pair is scored. See About for what each option means.

Top-K

How many ranked change events to return.

1 10

Example queries — click to fill. Work best on the default LEVIR-CC corpus; see About for per-corpus tips.

Top match

Before ↔ After — drag the divider to compare

After ↔ change heatmap — drag to reveal Δ

Left: swipe Before ↔ After. Right: swipe the After image against the query-conditioned change heatmap (jet — warm = query-change grew, cool = little/none) to dial the overlay in and out. See About.

Press Search to retrieve.

Download images

All matches

Columns: score = raw change Δ-similarity (model units); match (0–1) = relative rank within this query (min–max normalised, not a probability); caption = the pair's dataset caption; land cover change = permanent / likely-seasonal / stable note (see About). Before/After are the two timesteps.