What changed on the ground, measured from orbit.

Terarscope turns open Sentinel-2 imagery into vegetation-change measurements you can put in front of a client or a regulator. Built for sites across the Niger Delta that are slow, costly or unsafe to inspect on foot.

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Baseline · Jan–Mar 2025Comparison · Jan–Mar 2026
Mean NDVI
0.60 → 0.56
Mean change
−0.039
Beyond −0.15
9.1 ha
11.6% of valid area
Valid pixels
79%
of 99.4 ha
−0.10.9 NDVICloud-masked, excludedSynthetic demo scene at 10 m. The figures are computed from the pixels shown.

From a boundary to a report in one sitting.

  1. Select

    Draw the site boundary on the map, or search for it by name or coordinates. Terarscope gives you its area in hectares before you commit.

  2. Retrieve

    It finds every Sentinel-2 surface-reflectance scene that crosses your boundary in the two periods you choose, and shows which are too cloudy to use.

  3. Analyse

    Cloud, shadow and invalid pixels are masked. What remains is composited per period, and NDVI is computed at 10 m from the near-infrared and red bands.

  4. Understand

    You see both periods side by side, the change map, the area past your threshold, and how much of the site the result actually covers.

  5. Export

    One PDF carries the map, the numbers, the scene IDs and the method version, so a second analyst can run it again and get the same answer.

A drop in NDVI is a measurement. What caused it is a question.

Satellites see that vegetation changed. They do not see why. Terarscope keeps the two apart in every screen and every report, because findings that blur them do not survive a dispute.

What Terarscope reports

  • Which scenes were used, and when each was acquired
  • Mean NDVI for each period and the difference between them
  • Hectares where the decline passed your threshold
  • The share of the site with usable pixels in both periods
  • The thresholds, masks and method version behind every figure

What it leaves to you

  • Why the vegetation changed
  • Who or what is responsible
  • Whether a spill, clearing, flood or season explains it

High-stakes conclusions need a specialist and a visit to the site. The report says so.

The report is the product.

Every export names its source scenes, its thresholds and the version of the method that produced it. Hand it to another analyst and they can reproduce the numbers.

This specimen is generated from the demo scene above.

terarscope

Vegetation change report

Report ID
TR-SPECIMEN-0001
Generated
2026-11-12 03:40 UTC
Method
ndvi-change 1.0.0
−0.4+0.3 ΔNDVI
Site
Specimen site A
Area of interest
99.36 ha
Baseline
2025-01-01 to 2025-03-31
Comparison
2026-01-01 to 2026-03-31
Decrease threshold
−0.15
Minimum coverage
70%

Observed measurements

Mean NDVI, baseline0.596
Mean NDVI, comparison0.557
Mean change−0.039
Area beyond threshold9.13 ha (11.6%)
Valid-pixel coverage79.3%

Limitations

These figures describe a change in a vegetation index between two periods. They do not establish its cause. 21% of the site was masked for cloud in at least one period and is excluded from every figure above.

Start with one site.

We are running paid monitoring pilots with environmental consultancies and industrial facility operators in the Niger Delta. Bring a site you already know well, and check our numbers against what you have seen on the ground.

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