Name: 2022 Estuary Area

Display Field: Estuary

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 and Otago Regional Council

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Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

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Object ID Field: OBJECTID

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Type ID Field:

Fields:

• OBJECTID (type: esriFieldTypeOID, alias: FID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
• Estuary (type: esriFieldTypeString, alias: Estuary, SQL Type: sqlTypeOther, length: 254, nullable: true, editable: true)
• Year (type: esriFieldTypeString, alias: Year, SQL Type: sqlTypeOther, length: 254, nullable: true, editable: true)
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• Area_ha (type: esriFieldTypeDouble, alias: Area_ha, SQL Type: sqlTypeOther, nullable: true, editable: true)
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Name: Catlins_2022_Estuary
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Last Edit Date: 12/9/2025 3:29:41 AM

Schema Last Edit Date: 12/9/2025 3:27:45 AM

Data Last Edit Date: 12/9/2025 3:27:45 AM

Supported Operations:   Query   Query Pivot   Query Top Features   Query Analytic   Query Bins   Generate Renderer   Validate SQL   Get Estimates   ConvertFormat