Name: 2023 High Enrichment Conditions

Display Field: Zone

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Description: 2023 Broad Scale Mapping of the Catlins / Pounawea Estuary was undertaken by Salt Ecology on behalf of Otago Regional Council and is described in: Roberts KL, Scott-Simmonds T, Rabel H, Stevens LM. 2024. Synoptic Broad Scale Ecological Assessment of Catlins/ Pounawea Estuary. Salt Ecology Report 144, prepared for Otago Regional Council, August 2024. 74p. Ground-truthing was conducted during December 2023. Features were mapped onto 30cm/pixel colour satellite imagery captured 29 October 2023 . Generally, at a digitising scale of 1:2000, spatial accuracy for features clearly visible on aerial photos (e.g. salt marsh, cobble fields, dense macroalgae) is ~2 metres. Spatial accuracy for features difficult to distinguish on aerial photos (e.g., where boundaries represent a habitat transition from mud to sand) is ~10 to 50 metres depending on the extent of ground truthing undertaken. Features were digitised and field codes recorded by Salt Ecology in a master layer. Salt Ecology proprietary scripting tools were used to validate field codes, check for topology errors, produce symbolised output layers and create summary data tables. Areas with High Enrichment Conditions (HECs) characterise substrates with extreme levels of organic or nutrient enrichment (i.e., eutrophication). HECs are sediments depleted in (or devoid of) oxygen, which have a very shallow aRPD (e.g., 2%). In a broad scale context, the HEC metric is recorded on field maps and is intended to highlight areas of enrichment that may require further investigation. GIS scripting is also used to identify mud-dominated sediments (>=50% mud content, based on expert judgement) that have >50% cover of entrained macroalgae growing as stable beds within the sediment as a cross-check of potential issues. Use with permission of Otago Regional Council and acknowledgment of Salt Ecology.

Copyright Text: Salt Ecology

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Last Edit Date: 12/9/2025 3:29:41 AM

Schema Last Edit Date: 12/9/2025 3:27:47 AM

Data Last Edit Date: 12/9/2025 3:27:47 AM

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