Index of Estuarine Condition Submerged Vegetation Data

dataset: IEC2021_SUB_VEG
IEC2021_SUB_VEG is the spatial representation of submerged vegetation used in the calculation of Index of Estuarine Condition (IEC) scores. In the context of the IEC, 'submerged vegetation' refers to aquatic plants attached to bottom sediments that are generally entirely submerged but may be exposed during very low tides. Field data was collected at various locations within the estuary to ground-truth the mapping of full coverage derived from available aerial imagery. The field data was collected in late spring, summer and early autumn to correspond with warmer water temperatures and longer photoperiods, and to avoid winter periods of submerged vegetation dieback. In the field, ground-truthing by taking photos of the benthic environment largely followed the protocols outlined in Woodland and Cook (2015). If the estuarine bed was visible, photographic samples were collected of the different vegetation types present. Coverages of these different vegetation types (e.g. dense, sparse) were also photographed as well as bare ground. Ground-truthed benthic images were mapped over high-resolution (<20 cm) aerial imagery sourced from the DELWP imagery archive. Only imagery later than 2010 was considered, with most of the imagery used captured later than 2015. RPAS imagery collected for some estuaries was geo-rectified and mosaicked to provide very high-resolution imagery for mapping. Mapped areas were then compared to the geo-referenced ground-truthed benthic images and assigned a vegetation-coverage class and an indication of classification confidence (High, Medium or Low). For each estuary, MA:TV was then derived from the ratio of total macroalgae area to total vegetated area (i.e. seagrass and macroalgae) as per Woodland and Cook (2015). Briefly, vegetated habitat areas were weighted by their coverage classes such that polygons assigned `sparse¿medium¿ coverage were considered to contain 50% vegetation, and those assigned as `dense¿ coverage were considered as 100% vegetated. The ratio of macroalgae to total vegetation (MA:TV) was calculated as the sum of the weighted macroalgae areas divided by the sum of the weighted seagrass and macroalgae areas. MA:TV ranges from 0 to 1.
 
Citation proposal Citation proposal
(2021)

Index of Estuarine Condition Submerged Vegetation Data

Department of Energy, Environment and Climate Action
 

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Identifiers and Keywords

ANZLIC Id
ANZVI0803008717 
Victorian Spatial Data Library (VSDL) Schema
WATER:IEC2021_SUB_VEG 
Jurisdiction
Victoria 
Topic category
  • Inland waters
  • Oceans
 

Resource Constraints

Classification
Unclassified  
Creative Commons Attribution 4.0 (CC-BY)
 

Other Dataset Details

Date ( Revision )
2021-10-15
Date ( Publication )
2021-09-04T01:55:24
Status
Completed  
Purpose
Component of the Index for Estuarine Condition 
Supplemental Information
Related Documents: None 
Maintenance and update frequency
Not planned  
Maintenance date ( Publication )
2021-09-04T01:55:24
 

Spatial

Spatial representation type
Vector  
Description
General - Victoria 
Reference system identifier
4283

N
S
E
W


 

Temporal

Begin date
2017-01-24 
End date
2019-02-08 
 

Quality

Missing Data
Statewide Completeness Verification: - 
Excess Data
- 
Attribute Quality
Vegetation classifications are outlined in Pope et al (2015) and derived from field sub sampling and high resolution aerial imagery 
Positional Accuracy
Polygons are derived from references to multiple sources of high resolution aerial imagery during time periods suitable to field sampling events. 
 

Lineage

Statement
Dataset Source: Field sub sampling and digitisation from high resolution aerial imagery conducted by the Arthur Rylah Institute. Classifications sourced from Pope, A., J. Barton, and G. P. Quinn. 2015. Victorian Index of Estuary Condition: Implementation Trial Final Report. Warrnambool, Victoria. Dataset Originality: Primary & Derived 
 

Attributes

Column Name Obligation Unique Data Type Data Length Data Precision Data Scale Reference Table Owner Reference Table Name Reference Table Code Column Name Short Column Name Definition
IEC_CONDITION_CATEGORY O N VARCHAR2 20 IECCONCAT
SE_ANNO_CAD_DATA O N BLOB 4000 SEANNOCAD
ALT_NAME O N VARCHAR2 150 ALT_NAME
EUID O N NUMBER 22 5 0 EUID
EZY_NAME O N VARCHAR2 150 EZY_NAME
DATE_CREATED O N DATE 7 DATE_CR
IEC_SCORE O N VARCHAR2 5 IEC_SCORE
SOURCE O N VARCHAR2 50 SOURCE
SUBVEG O N VARCHAR2 50 SUBVEG
SV_DENSITY O N VARCHAR2 50 SV_DENSITY
ESTUARY O N VARCHAR2 50 ESTUARY
 

About the Metadata Record

Metadata identifier
ae75c7f7-2665-5169-9fc6-cd244aab88d1

Contact  

No information provided.
Resource Type
Dataset  
Date info ( Revision )
2021-10-15
Standard Name
ISO 19115-3:2018 
Profile Name
DELWP Profile 
Profile Version
Version 1 
Profile Date
2019-05-24  
 

Metadata Constraints

Classification
Unclassified  
 
 

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