Name: 2022 Macroalgae Percent Cover
Display Field: Category
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: Ground-truthing of dominant macroalgae and seagrass was undertaken by Salt Ecology on 1 December 2021. Features were recorded directly onto 30 cm pixel resolution (0.30 m GSD), 3-band (RGB) uncompressed GeoTIFF colour aerial imagery captured between 12 January and 5 February 2021 by Aerial Surveys Ltd and supplied by ORC.
Each feature was digitised and field codes recorded in a master layer used to produce individual summary output layers using in-house scripting to validate field codes and check for any errors in geometry or typology.
Spatial accuracy for features clearly visible on aerial photos (e.g. dense macroalgae) is ~2 metres. Spatial accuracy for features difficult to distinguish on aerial photos (e.g. sparse macroalgal beds) is ~10 to 20 metres depending on the extent of ground-truthing undertaken.
Macroalgal features were classified based on estimated percent cover, measured biomass (g/m2 wet weight) and presence of entrainment (e.g. growing as stable beds rooted within the sediment).
Areas with High Enrichment Conditions (HECs) - also termed Gross Eutrophic Zones (GEZs) were defined as mud-dominated sediments (>50% mud content, based on expert judgement) with >50% macroalgal cover and with macroalgae entrained. These areas typically also have an aRPD depth shallower than 10mm due to sediment anoxia and elevated organic content (i.e. >1%)
Copyright Text: Salt Ecology
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Supported query Formats: JSON, geoJSON, PBF
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Spatial Reference: 2193 (2193)
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Last Edit Date: 12/9/2025 3:29:40 AM
Schema Last Edit Date: 12/9/2025 3:27:46 AM
Data Last Edit Date: 12/9/2025 3:27:46 AM
Supported Operations:
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