Query: What changed, and where?
Task: change · Input config: bitemporal
· Confidence: 0.582
Based on the provided measurements and visual evidence, here’s what changed between Image 1 (earlier) and Image 2 (later): What Changed: - Water/Flooding Increased: The most significant change is a large area of new or increased water coverage, likely due to flooding. This is confirmed by: - A negative NDVI delta (-0.981), indicating loss of vegetation cover (likely submerged crops). - A positive NDWI delta (+0.838), which typically indicates increased water content in the canopy. - The tool explicitly flags this as "likely new water / flooding." Where: - The change occurred primarily along the river channel and its immediate floodplain, extending into adjacent agricultural fields. - In Image 1, the river appears as a dark blue line with some green/brown patches on either side (vegetated banks). - In Image 2, this same area is
[
{
"name": "river_t1.tif",
"modality": "optical",
"bands": 4,
"size": [
1024,
1024
],
"crs": null
},
{
"name": "river_t2.tif",
"modality": "optical",
"bands": 4,
"size": [
1024,
1024
],
"crs": null
}
]
| # | tool | status | ms | params | stats | conf | output |
|---|---|---|---|---|---|---|---|
| 1 | change_cva | ok | 88 | {"threshold": null, "noise_k": 2.0} | {"changed_pct": 9.16, "threshold": 1.666, "ndvi_delta_in_changed": -0.981, "ndwi_delta_in_changed": 0.838, "likely": "new water / flooding"} | None | |
| 2 | vlm_change | ok | 11067 | {"max_tokens": 200} | null | 0.582 | Based on the provided measurements and visual evidence, here’s what changed between Image 1 (earlier) and Image 2 (later): What Changed: - Water/Flooding Increased: The most significant change is a large area of new or increased water coverage, likely due to flooding. This is confirmed by: - A negative NDVI delta (-0.981), indicating loss of vegetation cover (likely submerged crops). - A positive NDWI delta (+0.838), which typically indicates increased water content in the canopy. - The tool explicitly flags this as "likely new water / flooding." Where: - The change occurred primarily along the river channel and its immediate floodplain, extending into adjacent agricultural fields. - In Image 1, the river appears as a dark blue line with some green/brown patches on either side (vegetated banks). - In Image 2, this same area is |