Metrics reference

Metrics reference

Definitions, sources, and aggregation rules for MariMap survey, satellite, and restoration metrics used in MRV and disclosures.

How to read this reference

Metric keys are stable identifiers used in MariMap dashboards, reports, and exports. Each metric lists its source, protocol, and aggregation. Survey metrics are computed from field observations; satellite metrics are sampled at the site grid cell or coastal bands. Condition categories and heat-stress thresholds are contextual indicators, not verified outcomes.

Survey coverage and effort

Survey effort, staffing, and sampling footprint derived from field survey records.

Surveys

Metric key: survey.count

Number of surveys completed within the selected scope and time range.

  • Unit: surveys
  • Source: Field surveys
  • Method / protocol: Survey metadata
  • Aggregation: Count

Participants (total)

Metric key: survey.participants.total

Sum of recorded participants across surveys in the selected scope and time range.

  • Unit: people
  • Source: Field surveys
  • Method / protocol: Survey metadata
  • Aggregation: Sum

Participants (mean)

Metric key: survey.participants.mean

Average participants per survey in the selected scope and time range.

  • Unit: people
  • Source: Field surveys
  • Method / protocol: Survey metadata
  • Aggregation: Mean

Survey duration (total)

Metric key: survey.duration_hours.total

Total logged survey duration in hours across the selected scope and time range.

  • Unit: hours
  • Source: Field surveys
  • Method / protocol: Survey metadata
  • Aggregation: Sum

Survey duration (mean)

Metric key: survey.duration_hours.mean

Average survey duration in hours per survey.

  • Unit: hours
  • Source: Field surveys
  • Method / protocol: Survey metadata
  • Aggregation: Mean

Divers (total)

Metric key: survey.divers.total

Sum of divers recorded across surveys.

  • Unit: people
  • Source: Field surveys
  • Method / protocol: Survey metadata
  • Aggregation: Sum

Media items

Metric key: survey.media.count

Total photos, videos, and media files attached to surveys.

  • Unit: items
  • Source: Field surveys
  • Method / protocol: Survey metadata
  • Aggregation: Count

Artifacts

Metric key: survey.artifacts.count

Total uploaded artifacts and files linked to surveys.

  • Unit: items
  • Source: Field surveys
  • Method / protocol: Survey metadata
  • Aggregation: Count

Observation units

Metric key: survey.observation_units.count

Number of observation units (transects, plots, quadrats) recorded.

  • Unit: units
  • Source: Field surveys
  • Method / protocol: Survey metadata
  • Aggregation: Count

Transect length (total)

Metric key: survey.transect_length_m.total

Total transect length sampled across surveys.

  • Unit: m
  • Source: Field surveys
  • Method / protocol: Survey metadata
  • Aggregation: Sum

Transect area (total)

Metric key: survey.transect_area_m2.total

Total surveyed transect area across surveys.

  • Unit: m2
  • Source: Field surveys
  • Method / protocol: Survey metadata
  • Aggregation: Sum

Benthic transects

Benthic cover and condition metrics from PIT/LIT/CIT transects.

Live coral cover

Metric key: benthic.live_coral_pct

Percent of benthic cover classified as live hard coral.

  • Unit: %
  • Source: Field surveys
  • Method / protocol: Benthic transect (PIT/LIT/CIT)
  • Aggregation: Percent

Dead coral cover

Metric key: benthic.dead_coral_pct

Percent of benthic cover classified as dead coral.

  • Unit: %
  • Source: Field surveys
  • Method / protocol: Benthic transect (PIT/LIT/CIT)
  • Aggregation: Percent

Rubble cover

Metric key: benthic.rubble_pct

Percent of benthic cover classified as rubble.

  • Unit: %
  • Source: Field surveys
  • Method / protocol: Benthic transect (PIT/LIT/CIT)
  • Aggregation: Percent

Sand cover

Metric key: benthic.sand_pct

Percent of benthic cover classified as sand.

  • Unit: %
  • Source: Field surveys
  • Method / protocol: Benthic transect (PIT/LIT/CIT)
  • Aggregation: Percent

Transects

Metric key: benthic.transects.count

Number of benthic transects recorded.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Benthic transect (PIT/LIT/CIT)
  • Aggregation: Count

PIT hits

Metric key: benthic.pit_hits.count

Count of point-intercept hits recorded.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Benthic transect (PIT/LIT/CIT)
  • Aggregation: Count

LIT spans

Metric key: benthic.lit_spans.count

Count of line-intercept spans recorded.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Benthic transect (PIT/LIT/CIT)
  • Aggregation: Count

Cover by code

Metric key: benthic.cover_pct_by_code

Percent cover by benthic code or category for each survey.

  • Unit: %
  • Source: Field surveys
  • Method / protocol: Benthic transect (PIT/LIT/CIT)
  • Aggregation: Percent

Health by code

Metric key: benthic.health_pct_by_code

Percent cover by health category or benthic condition code.

  • Unit: %
  • Source: Field surveys
  • Method / protocol: Benthic transect (PIT/LIT/CIT)
  • Aggregation: Percent

Fish transects

Fish belt transect counts, biomass, and diversity.

Fish count

Metric key: fish.total_count

Total fish observed across belt transects.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Fish belt transect
  • Aggregation: Sum

Fish biomass

Metric key: fish.total_biomass_kg

Estimated total fish biomass derived from size classes.

  • Unit: kg
  • Source: Field surveys
  • Method / protocol: Fish belt transect
  • Aggregation: Sum

Species (distinct)

Metric key: fish.species.distinct.count

Distinct fish species recorded.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Fish belt transect
  • Aggregation: Distinct count

Genera (distinct)

Metric key: fish.genera.distinct.count

Distinct fish genera recorded.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Fish belt transect
  • Aggregation: Distinct count

Observations

Metric key: fish.observations.count

Total fish observations recorded.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Fish belt transect
  • Aggregation: Count

Fauna observations

Fauna observations and biodiversity counts from site surveys.

Species (total)

Metric key: fauna.total_species

Total fauna species observations summed across surveys.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Fauna observation
  • Aggregation: Sum

Genera (total)

Metric key: fauna.total_genera

Total fauna genera observations summed across surveys.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Fauna observation
  • Aggregation: Sum

Individuals (total)

Metric key: fauna.individuals.total

Total individual fauna counted.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Fauna observation
  • Aggregation: Sum

Observations

Metric key: fauna.observations.count

Total fauna observations recorded.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Fauna observation
  • Aggregation: Count

Species (distinct)

Metric key: fauna.species.distinct.count

Distinct fauna species recorded.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Fauna observation
  • Aggregation: Distinct count

Mangrove tree growth

Mangrove tree measurements and derived biomass/carbon metrics.

Trees (total)

Metric key: tree_growth.total_trees

Total trees measured in tree growth surveys.

  • Unit: trees
  • Source: Field surveys
  • Method / protocol: Tree growth (DBH/height)
  • Aggregation: Sum

DBH (mean)

Metric key: tree_growth.mean_dbh_cm

Mean diameter at breast height for measured trees.

  • Unit: cm
  • Source: Field surveys
  • Method / protocol: Tree growth (DBH/height)
  • Aggregation: Mean

Height (mean)

Metric key: tree_growth.mean_height_m

Mean tree height for measured trees.

  • Unit: m
  • Source: Field surveys
  • Method / protocol: Tree growth (DBH/height)
  • Aggregation: Mean

Biomass (total)

Metric key: tree_growth.total_biomass_kg

Total above-ground biomass estimated from tree measurements.

  • Unit: kg
  • Source: Field surveys
  • Method / protocol: Tree growth (DBH/height)
  • Aggregation: Sum

Carbon (total)

Metric key: tree_growth.total_carbon_kg

Total carbon stock estimated from tree measurements.

  • Unit: kg
  • Source: Field surveys
  • Method / protocol: Tree growth (DBH/height)
  • Aggregation: Sum

Species (distinct)

Metric key: tree_growth.species.distinct.count

Distinct mangrove species recorded.

  • Unit: count
  • Source: Field surveys
  • Method / protocol: Tree growth (DBH/height)
  • Aggregation: Distinct count

Benthic image surveys

Image-based survey volume and annotation outputs.

Images

Metric key: benthic_images.images.count

Number of benthic images captured.

  • Unit: images
  • Source: Field surveys
  • Method / protocol: Benthic image survey
  • Aggregation: Count

Annotated images

Metric key: benthic_images.images.annotated.count

Number of benthic images with annotations.

  • Unit: images
  • Source: Field surveys
  • Method / protocol: Benthic image survey
  • Aggregation: Count

Mask annotations

Metric key: benthic_images.annotations.masks.count

Total segmentation mask annotations.

  • Unit: annotations
  • Source: Field surveys
  • Method / protocol: Benthic image survey
  • Aggregation: Count

Point annotations

Metric key: benthic_images.annotations.points.count

Total point annotations.

  • Unit: annotations
  • Source: Field surveys
  • Method / protocol: Benthic image survey
  • Aggregation: Count

Heat stress indicators

NOAA Coral Reef Watch heat stress indicators used for reef risk context.

Sea surface temperature (NOAA CRW)

Metric key: noaa_crw.sst.value

Daily NOAA Coral Reef Watch CoralTemp sea surface temperature.

  • Unit: deg C
  • Source: NOAA Coral Reef Watch
  • Aggregation: Mean

SST anomaly (NOAA CRW)

Metric key: noaa_crw.ssta.value

Daily SST anomaly relative to the long-term mean.

  • Unit: deg C
  • Source: NOAA Coral Reef Watch
  • Aggregation: Mean

Degree heating weeks (NOAA CRW)

Metric key: noaa_crw.dhw.value

Cumulative heat stress over the previous 12 weeks.

  • Unit: deg C-weeks
  • Source: NOAA Coral Reef Watch
  • Aggregation: Sum

HotSpot (NOAA CRW)

Metric key: noaa_crw.hs.value

Current SST above the bleaching threshold (HotSpot).

  • Unit: deg C
  • Source: NOAA Coral Reef Watch
  • Aggregation: Mean

Bleaching alert area (NOAA CRW)

Metric key: noaa_crw.baa5.value

Bleaching alert level category derived by NOAA CRW.

  • Unit: n/a
  • Source: NOAA Coral Reef Watch
  • Aggregation: Score

Derived heat stress

Baselines and thresholds derived from SST time series.

Maximum monthly mean (MMM)

Metric key: derived.mmm

Site-specific maximum monthly mean SST computed from the baseline period.

  • Unit: deg C
  • Source: Derived / modeled
  • Aggregation: Mean

Bleaching threshold

Metric key: derived.bleaching_threshold

Bleaching threshold computed as MMM + 1 deg C.

  • Unit: deg C
  • Source: Derived / modeled
  • Aggregation: Mean

Ocean context

Satellite ocean conditions from Copernicus Marine Service (CMEMS).

Sea surface temperature (CMEMS)

Metric key: cmems.sst.value

Daily CMEMS SST sampled at the site grid cell.

  • Unit: deg C
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Sea surface salinity (CMEMS)

Metric key: cmems.sea_salinity.value

Daily CMEMS surface salinity sampled at the site grid cell.

  • Unit: PSU
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Chlorophyll-a (CMEMS)

Metric key: cmems.chlorophyll.value

Daily CMEMS chlorophyll-a concentration.

  • Unit: mg/m3
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Chlorophyll-a (multi-year, CMEMS)

Metric key: cmems.chlorophyll_my.value

Multi-year CMEMS chlorophyll-a estimate.

  • Unit: mg/m3
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Surface pH (CMEMS)

Metric key: cmems.ph.value

Daily CMEMS surface ocean pH estimate.

  • Unit: pH
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Surface current speed (CMEMS)

Metric key: cmems.surface_current_speed.value

Surface current speed magnitude from CMEMS.

  • Unit: m/s
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Surface current direction (CMEMS)

Metric key: cmems.surface_current_direction.value

Surface current direction (0-360 degrees) from CMEMS.

  • Unit: deg
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Tide height / sea level proxy (CMEMS)

Metric key: cmems.tide_height.value

Sea level anomaly or tide height proxy from CMEMS.

  • Unit: m
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Sea level anomaly (CMEMS)

Metric key: cmems.sea_level_anomaly.value

Sea level anomaly relative to mean sea level (CMEMS).

  • Unit: m
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Wave and swell

Wave state and swell metrics from CMEMS wave products.

Wave height (CMEMS)

Metric key: cmems.wave_height.value

Significant wave height from the CMEMS wave model.

  • Unit: m
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Wave period (CMEMS)

Metric key: cmems.wave_period.value

Dominant wave period from the CMEMS wave model.

  • Unit: s
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Wave direction (CMEMS)

Metric key: cmems.wave_direction.value

Dominant wave direction (0-360 degrees).

  • Unit: deg
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Primary swell height (CMEMS)

Metric key: cmems.primary_swell_height.value

Primary swell height from the CMEMS wave model.

  • Unit: m
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Primary swell period (CMEMS)

Metric key: cmems.primary_swell_period.value

Primary swell period from the CMEMS wave model.

  • Unit: s
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Primary swell direction (CMEMS)

Metric key: cmems.primary_swell_direction.value

Primary swell direction (0-360 degrees).

  • Unit: deg
  • Source: Copernicus Marine Service (CMEMS)
  • Aggregation: Mean

Land context

Land surface and land cover metrics from Copernicus Land Monitoring Service (CLMS).

NDVI (CLMS)

Metric key: clms.ndvi.value

Normalized Difference Vegetation Index (10-daily).

  • Unit: n/a
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Mean

NDVI quality flag (CLMS)

Metric key: clms.ndvi_qflag.value

Quality flag for NDVI; lower values indicate better quality.

  • Unit: n/a
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Mean

NDVI observation count (CLMS)

Metric key: clms.ndvi_nobs.value

Number of observations contributing to NDVI composite.

  • Unit: n/a
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Mean

NDVI uncertainty (CLMS)

Metric key: clms.ndvi_uncertainty.value

Uncertainty estimate for NDVI composite.

  • Unit: n/a
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Mean

Land surface temperature (CLMS)

Metric key: clms.lst_day.value

Daytime land surface temperature (10-daily).

  • Unit: deg C
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Mean

Tree cover fraction (CLMS)

Metric key: clms.lc_tree_pct.value

Percent of land cover classified as tree cover.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Shrub cover fraction (CLMS)

Metric key: clms.lc_shrub_pct.value

Percent of land cover classified as shrub cover.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Grass cover fraction (CLMS)

Metric key: clms.lc_grass_pct.value

Percent of land cover classified as grass cover.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Crops cover fraction (CLMS)

Metric key: clms.lc_crops_pct.value

Percent of land cover classified as crops.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Bare cover fraction (CLMS)

Metric key: clms.lc_bare_pct.value

Percent of land cover classified as bare ground.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Built-up cover fraction (CLMS)

Metric key: clms.lc_builtup_pct.value

Percent of land cover classified as built-up areas.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Permanent water fraction (CLMS)

Metric key: clms.lc_water_perm_pct.value

Percent of land cover classified as permanent water.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Seasonal water fraction (CLMS)

Metric key: clms.lc_water_seasonal_pct.value

Percent of land cover classified as seasonal water.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Snow/ice fraction (CLMS)

Metric key: clms.lc_snow_pct.value

Percent of land cover classified as snow or ice.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Tree canopy density (CLMS)

Metric key: clms.tree_canopy_pct.value

Tree canopy density from the CLMS pantropical product.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Burned area fraction (CLMS)

Metric key: clms.burnt_area_pct.value

Burned area fraction for the period.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Burned area confidence (CLMS)

Metric key: clms.burnt_area_confidence_pct.value

Confidence of burned area detection.

  • Unit: %
  • Source: Copernicus Land Monitoring Service (CLMS)
  • Aggregation: Percent

Human pressure

Human pressure metrics from the Global Human Settlement Layer (GHSL).

Population (GHSL)

Metric key: ghsl.population.value

Population count per grid cell.

  • Unit: people
  • Source: Global Human Settlement Layer (GHSL)
  • Aggregation: Sum

Built-up surface (GHSL)

Metric key: ghsl.built_area.value

Built-up surface area per grid cell.

  • Unit: m2
  • Source: Global Human Settlement Layer (GHSL)
  • Aggregation: Sum

Built-up volume (GHSL)

Metric key: ghsl.built_volume.value

Built-up volume proxy per grid cell.

  • Unit: m3
  • Source: Global Human Settlement Layer (GHSL)
  • Aggregation: Sum

Restoration facility

Fragment monitoring, measurements, and outplant performance metrics.

Fragments total

Metric key: restoration.fragments.total

Total coral fragments tracked at the facility.

  • Unit: count
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Count

Fragments alive

Metric key: restoration.fragments.alive

Fragments with status Alive (summary rollup).

  • Unit: count
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Count

Outplants total

Metric key: restoration.outplants.total

Total outplant batches recorded.

  • Unit: count
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Count

Outplant survival %

Metric key: restoration.outplants.survival_pct

Percent of outplanted fragments surviving.

  • Unit: %
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Percent

Measurements

Metric key: restoration.measurement.count

Count of fragment measurement events.

  • Unit: count
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Count

Fragment size (mean)

Metric key: restoration.measurement.size_value

Mean fragment size value based on the selected size metric.

  • Unit: n/a
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Mean

Bleaching (%)

Metric key: restoration.measurement.bleaching_pct

Mean bleaching percent recorded in measurements.

  • Unit: %
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Percent

Partial mortality (%)

Metric key: restoration.measurement.partial_mortality_pct

Mean partial mortality percent recorded in measurements.

  • Unit: %
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Percent

Disease prevalence

Metric key: restoration.measurement.disease_present

Percent of measurements with disease present.

  • Unit: %
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Percent

Predation prevalence

Metric key: restoration.measurement.predation_present

Percent of measurements with predation present.

  • Unit: %
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Percent

Fragment status: alive

Metric key: restoration.fragment.status.alive

Count of fragments currently marked alive.

  • Unit: count
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Count

Fragment status: outplanted

Metric key: restoration.fragment.status.outplanted

Count of fragments marked outplanted.

  • Unit: count
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Count

Fragment status: dead

Metric key: restoration.fragment.status.dead

Count of fragments marked dead.

  • Unit: count
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Count

Fragment status: lost

Metric key: restoration.fragment.status.lost

Count of fragments marked lost.

  • Unit: count
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Count

Fragment status: merged

Metric key: restoration.fragment.status.merged

Count of fragments marked merged.

  • Unit: count
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Count

Fragment status: archived

Metric key: restoration.fragment.status.archived

Count of fragments archived.

  • Unit: count
  • Source: Restoration facility logs
  • Method / protocol: Restoration facility monitoring
  • Aggregation: Count

Aggregated indices

Composite indicators and index-level rollups.

Human Impact Index (HPI)

Metric key: aggregated.hpi

Composite index combining ocean stress and human pressure indicators.

  • Unit: n/a
  • Source: Aggregated indicator
  • Aggregation: Index (unitless)
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