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KNOWLEDGE BASE

Monitoring restoration: NDVI, plots and survival

Combine satellite greenness (NDVI) with field plots and survival counts.

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Intermediate 1 min read restorationNDVImonitoringremote sensing

Three kinds of evidence together tell you if a restoration is working.

  1. NDVI (Normalised Difference Vegetation Index). A satellite-derived score of how green and dense vegetation is, from about 0 (bare) to 1 (very dense). A rising NDVI over several years suggests canopy is growing. Atlas holds NDVI for natural-regeneration protection zones for fiscal years 2023–25.
  2. Monitoring plots. Small marked areas where people count seedlings, measure height and record species. Atlas holds 17 natural-regeneration plots.
  3. Survival and condition surveys. Return visits to planted areas to count what survived and assess health and threats.

How to read NDVI. Compare the same season in different years, and compare the restored area with an untouched reference. Mangrove NDVI rises with canopy density but can saturate at high values, so it works best for early recovery.

Good practice. Record the planting date, species and tidal position at the start; without them, later numbers cannot be interpreted.

Limits. NDVI shows greenness, not carbon or biodiversity. Cloud and tide affect it in the tropics.

Related reading

How satellites see mangroves

Radar sees through cloud and optical sensors see colour; maps combine both.

How mangrove restoration works (and fails)

Fix the water flow first, let the forest regrow naturally where it can, and plant only when needed.

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