Description: Ground-truthing of dominant substrate, saltmarsh, macroalgae, seagrass, and terrestrial margin (200m) was undertaken by Wriggle Coastal Management over December 2016. Features were recorded directly onto rectified ~0.25m/pixel resolution colour aerial photos flown in 2014/15 and sourced from LINZ online data service.
In 2021, Salt Ecology in-house scripting was used to validate 2016 field codes and check for topology errors. In the 2016 master layer, "Orig_Code" is the original 2016 field code and "FieldCode" shows any changes made. Field codes were updated to reflect improvements to the classification of substrate and any mapping errors that were found have been corrected.
Spatial accuracy for features clearly visible on aerial photos (e.g. salt marsh, cobble fields) 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 20 metres depending on the extent of ground truth undertaken.
Field codes present features in order of their dominance; e.g Lesi Sare = (Lesi (rushland) dominant to Sare (herbfield)). Vegetation height is able to be derived from the structural class of features; e.g. Lesi (rushland) is taller than Sare (herbfield).
Catchment land cover was sourced from Landcare Research Land Cover Database (LCDB5, 2018).
Sand and mud substrate classifications were validated through the laboratory analysis of representative samples for sediment grain size.
Macroalgal features were classified based on estimated percent cover, measured biomass (g/sq m wet weight) and presence of entrainment (growing >30mm within sediment).
The primary indicators used to assess sediment oxygenation are aRPD depth and RP measured at 3cm. These indicators were measured at representative sites throughout the dominant sand
and mud substrate types, and from a range of sites with variable macroalgal cover and bio-mass. Results have been used to delineate LowO2 zones where sediment oxygen is depleted to the extent that
adverse impacts to macrofauna (sediment and surface dwelling animals) are expected.
Description: Ground-truthing of dominant substrate, saltmarsh, macroalgae, seagrass, and terrestrial margin (200m) was undertaken by Wriggle Coastal Management over December 2016. Features were recorded directly onto rectified ~0.25m/pixel resolution colour aerial photos flown in 2014/15 and sourced from LINZ online data service.
In 2021, Salt Ecology in-house scripting was used to validate 2016 field codes and check for topology errors. In the 2016 master layer, "Orig_Code" is the original 2016 field code and "FieldCode" shows any changes made. Field codes were updated to reflect improvements to the classification of substrate and any mapping errors that were found have been corrected.
Spatial accuracy for features clearly visible on aerial photos (e.g. salt marsh, cobble fields) 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 20 metres depending on the extent of ground truth undertaken.
Field codes present features in order of their dominance; e.g Lesi Sare = (Lesi (rushland) dominant to Sare (herbfield)). Vegetation height is able to be derived from the structural class of features; e.g. Lesi (rushland) is taller than Sare (herbfield).
Catchment land cover was sourced from Landcare Research Land Cover Database (LCDB5, 2018).
Sand and mud substrate classifications were validated through the laboratory analysis of representative samples for sediment grain size.
Macroalgal features were classified based on estimated percent cover, measured biomass (g/sq m wet weight) and presence of entrainment (growing >30mm within sediment).
The primary indicators used to assess sediment oxygenation are aRPD depth and RP measured at 3cm. These indicators were measured at representative sites throughout the dominant sand
and mud substrate types, and from a range of sites with variable macroalgal cover and bio-mass. Results have been used to delineate LowO2 zones where sediment oxygen is depleted to the extent that
adverse impacts to macrofauna (sediment and surface dwelling animals) are expected.
Description: Ground-truthing of dominant substrate, saltmarsh, macroalgae, seagrass, and terrestrial margin (200m) was undertaken by Wriggle Coastal Management over December 2016. Features were recorded directly onto rectified ~0.25m/pixel resolution colour aerial photos flown in 2014/15 and sourced from LINZ online data service.
In 2021, Salt Ecology in-house scripting was used to validate 2016 field codes and check for topology errors. In the 2016 master layer, "Orig_Code" is the original 2016 field code and "FieldCode" shows any changes made. Field codes were updated to reflect improvements to the classification of substrate and any mapping errors that were found have been corrected.
Spatial accuracy for features clearly visible on aerial photos (e.g. salt marsh, cobble fields) 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 20 metres depending on the extent of ground truth undertaken.
Field codes present features in order of their dominance; e.g Lesi Sare = (Lesi (rushland) dominant to Sare (herbfield)). Vegetation height is able to be derived from the structural class of features; e.g. Lesi (rushland) is taller than Sare (herbfield).
Catchment land cover was sourced from Landcare Research Land Cover Database (LCDB5, 2018).
Sand and mud substrate classifications were validated through the laboratory analysis of representative samples for sediment grain size.
Macroalgal features were classified based on estimated percent cover, measured biomass (g/sq m wet weight) and presence of entrainment (growing >30mm within sediment).
The primary indicators used to assess sediment oxygenation are aRPD depth and RP measured at 3cm. These indicators were measured at representative sites throughout the dominant sand
and mud substrate types, and from a range of sites with variable macroalgal cover and bio-mass. Results have been used to delineate LowO2 zones where sediment oxygen is depleted to the extent that
adverse impacts to macrofauna (sediment and surface dwelling animals) are expected.
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Description: Ground-truthing of dominant substrate, saltmarsh, macroalgae, seagrass, and terrestrial margin (200m) was undertaken by Wriggle Coastal Management over December 2016. Features were recorded directly onto rectified ~0.25m/pixel resolution colour aerial photos flown in 2014/15 and sourced from LINZ online data service.
In 2021, Salt Ecology in-house scripting was used to validate 2016 field codes and check for topology errors. In the 2016 master layer, "Orig_Code" is the original 2016 field code and "FieldCode" shows any changes made. Field codes were updated to reflect improvements to the classification of substrate and any mapping errors that were found have been corrected.
Spatial accuracy for features clearly visible on aerial photos (e.g. salt marsh, cobble fields) 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 20 metres depending on the extent of ground truth undertaken.
Field codes present features in order of their dominance; e.g Lesi Sare = (Lesi (rushland) dominant to Sare (herbfield)). Vegetation height is able to be derived from the structural class of features; e.g. Lesi (rushland) is taller than Sare (herbfield).
Catchment land cover was sourced from Landcare Research Land Cover Database (LCDB5, 2018).
Sand and mud substrate classifications were validated through the laboratory analysis of representative samples for sediment grain size.
Macroalgal features were classified based on estimated percent cover, measured biomass (g/sq m wet weight) and presence of entrainment (growing >30mm within sediment).
The primary indicators used to assess sediment oxygenation are aRPD depth and RP measured at 3cm. These indicators were measured at representative sites throughout the dominant sand
and mud substrate types, and from a range of sites with variable macroalgal cover and bio-mass. Results have been used to delineate LowO2 zones where sediment oxygen is depleted to the extent that
adverse impacts to macrofauna (sediment and surface dwelling animals) are expected.
Description: Ground-truthing of dominant substrate, saltmarsh, macroalgae, seagrass, and terrestrial margin (200m) was undertaken by Wriggle Coastal Management over December 2016. Features were recorded directly onto rectified ~0.25m/pixel resolution colour aerial photos flown in 2014/15 and sourced from LINZ online data service.
In 2021, Salt Ecology in-house scripting was used to validate 2016 field codes and check for topology errors. In the 2016 master layer, "Orig_Code" is the original 2016 field code and "FieldCode" shows any changes made. Field codes were updated to reflect improvements to the classification of substrate and any mapping errors that were found have been corrected.
Spatial accuracy for features clearly visible on aerial photos (e.g. salt marsh, cobble fields) 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 20 metres depending on the extent of ground truth undertaken.
Field codes present features in order of their dominance; e.g Lesi Sare = (Lesi (rushland) dominant to Sare (herbfield)). Vegetation height is able to be derived from the structural class of features; e.g. Lesi (rushland) is taller than Sare (herbfield).
Catchment land cover was sourced from Landcare Research Land Cover Database (LCDB5, 2018).
Sand and mud substrate classifications were validated through the laboratory analysis of representative samples for sediment grain size.
Macroalgal features were classified based on estimated percent cover, measured biomass (g/sq m wet weight) and presence of entrainment (growing >30mm within sediment).
The primary indicators used to assess sediment oxygenation are aRPD depth and RP measured at 3cm. These indicators were measured at representative sites throughout the dominant sand
and mud substrate types, and from a range of sites with variable macroalgal cover and bio-mass. Results have been used to delineate LowO2 zones where sediment oxygen is depleted to the extent that
adverse impacts to macrofauna (sediment and surface dwelling animals) are expected.
Description: Ground-truthing of dominant substrate, saltmarsh, macroalgae, seagrass, and terrestrial margin (200m) was undertaken by Wriggle Coastal Management over December 2016. Features were recorded directly onto rectified ~0.25m/pixel resolution colour aerial photos flown in 2014/15 and sourced from LINZ online data service.
In 2021, Salt Ecology in-house scripting was used to validate 2016 field codes and check for topology errors. In the 2016 master layer, "Orig_Code" is the original 2016 field code and "FieldCode" shows any changes made. Field codes were updated to reflect improvements to the classification of substrate and any mapping errors that were found have been corrected.
Spatial accuracy for features clearly visible on aerial photos (e.g. salt marsh, cobble fields) 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 20 metres depending on the extent of ground truth undertaken.
Field codes present features in order of their dominance; e.g Lesi Sare = (Lesi (rushland) dominant to Sare (herbfield)). Vegetation height is able to be derived from the structural class of features; e.g. Lesi (rushland) is taller than Sare (herbfield).
Catchment land cover was sourced from Landcare Research Land Cover Database (LCDB5, 2018).
Sand and mud substrate classifications were validated through the laboratory analysis of representative samples for sediment grain size.
Macroalgal features were classified based on estimated percent cover, measured biomass (g/sq m wet weight) and presence of entrainment (growing >30mm within sediment).
The primary indicators used to assess sediment oxygenation are aRPD depth and RP measured at 3cm. These indicators were measured at representative sites throughout the dominant sand
and mud substrate types, and from a range of sites with variable macroalgal cover and bio-mass. Results have been used to delineate LowO2 zones where sediment oxygen is depleted to the extent that
adverse impacts to macrofauna (sediment and surface dwelling animals) are expected.
Description: Ground-truthing of dominant substrate, saltmarsh, macroalgae, seagrass, and terrestrial margin (200m) was undertaken by Wriggle Coastal Management over December 2016. Features were recorded directly onto rectified ~0.25m/pixel resolution colour aerial photos flown in 2014/15 and sourced from LINZ online data service.
In 2021, Salt Ecology in-house scripting was used to validate 2016 field codes and check for topology errors. In the 2016 master layer, "Orig_Code" is the original 2016 field code and "FieldCode" shows any changes made. Field codes were updated to reflect improvements to the classification of substrate and any mapping errors that were found have been corrected.
Spatial accuracy for features clearly visible on aerial photos (e.g. salt marsh, cobble fields) 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 20 metres depending on the extent of ground truth undertaken.
Field codes present features in order of their dominance; e.g Lesi Sare = (Lesi (rushland) dominant to Sare (herbfield)). Vegetation height is able to be derived from the structural class of features; e.g. Lesi (rushland) is taller than Sare (herbfield).
Catchment land cover was sourced from Landcare Research Land Cover Database (LCDB5, 2018).
Sand and mud substrate classifications were validated through the laboratory analysis of representative samples for sediment grain size.
Macroalgal features were classified based on estimated percent cover, measured biomass (g/sq m wet weight) and presence of entrainment (growing >30mm within sediment).
The primary indicators used to assess sediment oxygenation are aRPD depth and RP measured at 3cm. These indicators were measured at representative sites throughout the dominant sand
and mud substrate types, and from a range of sites with variable macroalgal cover and bio-mass. Results have been used to delineate LowO2 zones where sediment oxygen is depleted to the extent that
adverse impacts to macrofauna (sediment and surface dwelling animals) are expected.
Description: Ground-truthing of dominant substrate, saltmarsh, macroalgae, seagrass, and terrestrial margin (200m) was undertaken by Wriggle Coastal Management over December 2016. Features were recorded directly onto rectified ~0.25m/pixel resolution colour aerial photos flown in 2014/15 and sourced from LINZ online data service.
In 2021, Salt Ecology in-house scripting was used to validate 2016 field codes and check for topology errors. In the 2016 master layer, "Orig_Code" is the original 2016 field code and "FieldCode" shows any changes made. Field codes were updated to reflect improvements to the classification of substrate and any mapping errors that were found have been corrected.
Spatial accuracy for features clearly visible on aerial photos (e.g. salt marsh, cobble fields) 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 20 metres depending on the extent of ground truth undertaken.
Field codes present features in order of their dominance; e.g Lesi Sare = (Lesi (rushland) dominant to Sare (herbfield)). Vegetation height is able to be derived from the structural class of features; e.g. Lesi (rushland) is taller than Sare (herbfield).
Catchment land cover was sourced from Landcare Research Land Cover Database (LCDB5, 2018).
Sand and mud substrate classifications were validated through the laboratory analysis of representative samples for sediment grain size.
Macroalgal features were classified based on estimated percent cover, measured biomass (g/sq m wet weight) and presence of entrainment (growing >30mm within sediment).
The primary indicators used to assess sediment oxygenation are aRPD depth and RP measured at 3cm. These indicators were measured at representative sites throughout the dominant sand
and mud substrate types, and from a range of sites with variable macroalgal cover and bio-mass. Results have been used to delineate LowO2 zones where sediment oxygen is depleted to the extent that
adverse impacts to macrofauna (sediment and surface dwelling animals) are expected.
Description: 2023 Broad Scale Mapping of the Shag Estuary was undertaken by Salt Ecology on behalf of Otago Regional Council and is described in: O'Connell-Milne S, Forrest BM, Roberts KL, Stevens LM. 2024. Synoptic Broad Scale Ecological Assessment of Shag Estuary. Salt Ecology Report 134, prepared for Otago Regional Council, June 2024. 72p.
Ground-truthing was conducted during November 2023.
Features were mapped onto 30cm/pixel colour satellite imagery captured 15 April 2023 sourced from Apollo Mapping (Colorado).
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.
The estuary polygon layer depicts the mapped extent of the estuary and includes both the intertidal and subtidal areas.
Use with permission of Otago Regional Council and acknowledgment of Salt Ecology.
Description: 2023 Broad Scale Mapping of the Shag Estuary was undertaken by Salt Ecology on behalf of Otago Regional Council and is described in: O'Connell-Milne S, Forrest BM, Roberts KL, Stevens LM. 2024. Synoptic Broad Scale Ecological Assessment of Shag Estuary. Salt Ecology Report 134, prepared for Otago Regional Council, June 2024. 72p.
Ground-truthing was conducted during November 2023.
Features were mapped onto 30cm/pixel colour satellite imagery captured 15 April 2023 sourced from Apollo Mapping (Colorado).
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.
Description: 2023 Broad Scale Mapping of the Shag Estuary was undertaken by Salt Ecology on behalf of Otago Regional Council and is described in: O'Connell-Milne S, Forrest BM, Roberts KL, Stevens LM. 2024. Synoptic Broad Scale Ecological Assessment of Shag Estuary. Salt Ecology Report 134, prepared for Otago Regional Council, June 2024. 72p.
Ground-truthing was conducted during November 2023.
Features were mapped onto 30cm/pixel colour satellite imagery captured 15 April 2023 sourced from Apollo Mapping (Colorado).
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.
Macroalgal features were classified based on estimated percent cover, measured biomass (g/m2 wet weight) and presence of entrainment (i.e., stable macroalgal beds rooted >=30mm deep within sediment). PatchIDs identify a macroalgae bed or group of beds that share common classification metrics.
Use with permission of Otago Regional Council and acknowledgment of Salt Ecology.
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Description: 2023 Broad Scale Mapping of the Shag Estuary was undertaken by Salt Ecology on behalf of Otago Regional Council and is described in: O'Connell-Milne S, Forrest BM, Roberts KL, Stevens LM. 2024. Synoptic Broad Scale Ecological Assessment of Shag Estuary. Salt Ecology Report 134, prepared for Otago Regional Council, June 2024. 72p.
Ground-truthing was conducted during November 2023.
Features were mapped onto 30cm/pixel colour satellite imagery captured 15 April 2023 sourced from Apollo Mapping (Colorado).
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.
Microalgal features were classified based on estimated percent cover where presence was causing sediment degradation, primarily evident by surface sediments depleted in (or devoid of) oxygen.
Use with permission of Otago Regional Council and acknowledgment of Salt Ecology.
Description: 2023 Broad Scale Mapping of the Shag Estuary was undertaken by Salt Ecology on behalf of Otago Regional Council and is described in: O'Connell-Milne S, Forrest BM, Roberts KL, Stevens LM. 2024. Synoptic Broad Scale Ecological Assessment of Shag Estuary. Salt Ecology Report 134, prepared for Otago Regional Council, June 2024. 72p.
Ground-truthing was conducted during November 2023.
Features were mapped onto 30cm/pixel colour satellite imagery captured 15 April 2023 sourced from Apollo Mapping (Colorado).
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.
Dominant estuarine salt marsh species were mapped. Salt marsh species codes combine the two first letters of the Latin species and genus names (e.g. Pldi = Plagianthus divaricatus (ribbonwood)). Vegetation was recorded in order of dominance; e.g Lesi Sare = (Lesi (rushland) dominant to Sare (herbfield)). Vegetation height is able to be derived from the structural class of features; e.g. Lesi (rushland) is taller than Sare (herbfield).
Use with permission of Otago Regional Council and acknowledgment of Salt Ecology.
Description: 2023 Broad Scale Mapping of the Shag Estuary was undertaken by Salt Ecology on behalf of Otago Regional Council and is described in: O'Connell-Milne S, Forrest BM, Roberts KL, Stevens LM. 2024. Synoptic Broad Scale Ecological Assessment of Shag Estuary. Salt Ecology Report 134, prepared for Otago Regional Council, June 2024. 72p.
Ground-truthing was conducted during November 2023.
Features were mapped onto 30cm/pixel colour satellite imagery captured 15 April 2023 sourced from Apollo Mapping (Colorado).
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.
200m terrestrial margin land use and dominant vegetation cover was recorded around the estuary boundary. Land cover was classified according to the New Zealand Land Cover Database version 5.0 (LCDB5) with one exception. A duneland land cover class has been added to highlight a habitat that is of particular interest as it relates to estuaries.
Use with permission of Otago Regional Council and acknowledgment of Salt Ecology.
Description: 2023 Broad Scale Mapping of the Shag Estuary was undertaken by Salt Ecology on behalf of Otago Regional Council and is described in: O'Connell-Milne S, Forrest BM, Roberts KL, Stevens LM. 2024. Synoptic Broad Scale Ecological Assessment of Shag Estuary. Salt Ecology Report 134, prepared for Otago Regional Council, June 2024. 72p.
Ground-truthing was conducted during November 2023.
Features were mapped onto 30cm/pixel colour satellite imagery captured 15 April 2023 sourced from Apollo Mapping (Colorado).
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.
Dominant intertidal surface substrate features were mapped, including areas beneath salt marsh vegetation. Sand and mud substrate classifications were validated through the laboratory analysis of representative samples from the surface 20mm for sediment grain size.
Use with permission of Otago Regional Council and acknowledgment of Salt Ecology.
Description: 2023 Broad Scale Mapping of the Shag Estuary was undertaken by Salt Ecology on behalf of Otago Regional Council and is described in: O'Connell-Milne S, Forrest BM, Roberts KL, Stevens LM. 2024. Synoptic Broad Scale Ecological Assessment of Shag Estuary. Salt Ecology Report 134, prepared for Otago Regional Council, June 2024. 72p.
Ground-truthing was conducted during November 2023.
Features were mapped onto 30cm/pixel colour satellite imagery captured 15 April 2023 sourced from Apollo Mapping (Colorado).
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.
The intertidal layer depicts the area of exposed between high and low tides and has been divided into areas with and without salt marsh vegetation. The portion of the intertidal area not covered by salt marsh is referred to as the available intertidal habitat (AIH) for seagrass and macroalgae.
Use with permission of Otago Regional Council and acknowledgment of Salt Ecology.
Description: 2023 Broad Scale Mapping of the Shag Estuary was undertaken by Salt Ecology on behalf of Otago Regional Council and is described in: O'Connell-Milne S, Forrest BM, Roberts KL, Stevens LM. 2024. Synoptic Broad Scale Ecological Assessment of Shag Estuary. Salt Ecology Report 134, prepared for Otago Regional Council, June 2024. 72p.
Ground-truthing was conducted during November 2023.
Features were mapped onto 30cm/pixel colour satellite imagery captured 15 April 2023 sourced from Apollo Mapping (Colorado).
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.
The intertidal layer depicts the area of exposed between high and low tides and has been divided into areas with and without salt marsh vegetation. The portion of the intertidal area not covered by salt marsh is referred to as the available intertidal habitat (AIH) for seagrass and macroalgae.
Use with permission of Otago Regional Council and acknowledgment of Salt Ecology.
Description: 2023 Broad Scale Mapping of the Shag Estuary was undertaken by Salt Ecology on behalf of Otago Regional Council and is described in: O'Connell-Milne S, Forrest BM, Roberts KL, Stevens LM. 2024. Synoptic Broad Scale Ecological Assessment of Shag Estuary. Salt Ecology Report 134, prepared for Otago Regional Council, June 2024. 72p.
Ground-truthing was conducted during November 2023.
Features were mapped onto 30cm/pixel colour satellite imagery captured 15 April 2023 sourced from Apollo Mapping (Colorado).
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.
Subtidal areas have been mapped as water. Vegetation and substrate features visible in the subtidal zone were mapped and are reported as a separate output. These features do not represent a comprehensive assessment of subtidal features throughout the estuary.
Use with permission of Otago Regional Council and acknowledgment of Salt Ecology.