| Field | Value |
|---|---|
Title |
NSW Marine Estate Towed Video Imagery |
Alternative title(s) |
NSW Marine still imagery of the seabed for the NSW continental shelf |
Abstract |
Raw downward facing still imagery of the seabed over the NSW continental shelf acquired using NSW government's (Department of Climate Change Energy Environment and Water) towed video system aboard RV Bombora. Acquisition is ongoing (>2015) predominantly funded by the department under Coastal Reform Climate Change Fund project 'State-wide Science' and/or by various collaborative agencies (DPI; Parks Australia; FRDC) and educational institutions (UoW: UTas). Imagery is captured over areas to 1) ground-truth seabed typologies and validate habitat boundaries derived from multi-beam echosounder (MBES) surveys (www.aodn.org.au or www.ausseabed.gov.au) and/or 2) habitat assessments and monitoring to capture broad distribution of seabed benthic communities. For biodiversity-type assessments, imagery is captured, and transects/sites are selected in a sampling design in accordance with the Australian Field Manuals for Marine Sampling. Imagery captured is generally of benthic habitats in 10-120m of water depth over the NSW inner shelf. Georeferenced (XYZ) and time-stamped (UTC) still imagery is accessible via SEED, the online annotation platform Squidle+ and SeaMap Australia. |
Resource locator |
|
Data Quality Statement |
Name: Data Quality Statement Protocol: WWW:DOWNLOAD-1.0-http--download Description: Data quality statement for NSW Marine Estate Towed Video Imagery Function: download |
Unique resource identifier |
|
Code |
b91e1ded-8e6e-46d0-b690-eadf5d5b8816 |
Presentation form |
Image digital |
Edition |
1 |
Dataset language |
English |
Metadata standard |
|
Name |
ISO 19115 |
Edition |
2016 |
Dataset URI |
https://datasets.seed.nsw.gov.au/dataset/b91e1ded-8e6e-46d0-b690-eadf5d5b8816 |
Purpose |
baseline for monitoring |
Status |
Completed |
Spatial representation type |
video |
Spatial reference system |
|
Code identifying the spatial reference system |
4283 |
Spatial resolution |
1 m |
Additional information source |
Data were collected on 5-6 separate dates during the time period to acquire imagery once from each for the randomly selected locations identified at the start of the survey. |
| Field | Value |
|---|---|
Topic category |
| Field | Value |
|---|---|
Keyword set |
|
keyword value |
MARINE-Biology MARINE-Coasts MARINE-Reefs PHOTOGRAPHY-AND-IMAGERY-Remote-Sensing |
Originating controlled vocabulary |
|
Title |
ANZLIC Search Words |
Reference date |
2008-05-16 |
Geographic location |
|
West bounding longitude |
152.303467 |
East bounding longitude |
153.709717 |
North bounding latitude |
-32.670304 |
South bounding latitude |
-29.088277 |
NSW Place Name |
Port Stephens Great Lakes |
Vertical extent information |
|
Minimum value |
-100 |
Maximum value |
2228 |
Coordinate reference system |
|
Authority code |
urn:ogc:def:cs:EPSG:: |
Code identifying the coordinate reference system |
5711 |
Temporal extent |
|
Begin position |
2019-10-20 |
End position |
N/A |
Dataset reference date |
|
Resource maintenance |
|
Maintenance and update frequency |
Unknown |
Contact info | |
Contact position |
Data Broker |
Organisation name |
NSW Department of Climate Change, Energy, the Environment and Water |
Telephone number |
131555 |
Email address |
|
Web address |
https://www.nsw.gov.au/departments-and-agencies/dcceew |
Responsible party role |
pointOfContact |
| Field | Value |
|---|---|
Lineage |
Video surveying was undertaken following the recommendations detailed in 'Field Manuals for Marine Sampling to Monitor Australian Waters' ( https://www.nespmarine.edu.au/field-manuals-marine-sampling-monitor-australian-waters). Details of the NSW DPIE towed video system and equipment are provided in 'SeaBed NSW: Standard Operating Procedures of multibeam surveying' (https://www.environment.nsw.gov.au/-/media/OEH/Corporate-Site/Documents/Research/Our-science-and-research/seabed-nsw-standard-operating-procedures-multibeam-surveying-190101.pdf). XYZ positional accuracy of the still imagery is better than XY (3 degrees of slant range [eg. 2.6m radius @ 100m]; 2x ship’s speed for XY (horizontal) and/or >2x cable speed for Z (vertical). Filtered coordinates were then used to estimate ‘fish’ GPS location using the neighbouring average ( 3s time-step). Where a coordinate estimate was performed using one of these methods, the image’s metadata “Flag” column was populated with a “1” or “3” respectively. Interpolated positions were then validated by comparison of image content against bathymetric features at corresponding coordinates, primarily at transitions between high-relief reef and low-relief sediment. Image (JPG) and image metadata records (generated in csv format) were uploaded for access and annotation in Squidle+. |
| Field | Value |
|---|---|
Limitations on public access |
|
| Field | Value |
|---|---|
Scope |
dataset |
DQ Conceptual Consistency |
|
Effective date |
2020-05-18 |
Explanation |
As the imagery is acquired using a moving platform some images may capture the same section of seabed. Survey speed of ~1kt (0.51m/s); image capture rate 1 image every 2 seconds; and approximate area of seabed captured in each image. nb: tow-fish roll, pitch and heave values are recorded by the video camera and saved within the video data file. |
DQ Absolute External Positional Accuracy |
|
Effective date |
2020-05-18 |
Explanation |
Squidle+ ingestion of data requires a position and an altimetry value or height of the 'tow fish' above the seabed. At the time of acquisition, the the towed video system did not have an altimeter and thus the height of the tow fish was estimated as Tow-Fish Altitude = [Water Depth at Tow-Fish (from MBES survey)] - [Tow-Fish Pressure Sensor Depth] + [P-Sensor to SLR camera (offset =0.52)] nb. P-sensor value is not corrected for tide whereas MBES data is static to AHD. XY position of fish is determined by relative position of USBL transponder (fish) to transceiver (vessel). GPS position is G2 quality (~0.4-0.5 in real-time) and is relative to the vessels Centre of Mass (reference frame 0:0:0) with a 12.4m forward offset (X = -1.5) from transceiver to COM entered in the USBL software (Y = 0). USBL heading offset is checked following each installation (nominally 23 degrees from centreline) and USBL (Tracklink, USA) precision is 3 degrees of slant range value. Original image time-stamping is synched with computer UTC (<1s) but naming convention uses USBL/Video text feed based on POS MV output. |
| Field | Value |
|---|---|
Responsible party |
|
Contact position |
Data Broker |
Organisation name |
NSW Department of Climate Change, Energy, the Environment and Water |
Telephone number |
131555 |
Email address |
|
Web address |
https://www.nsw.gov.au/departments-and-agencies/dcceew |
Responsible party role |
pointOfContact |
| Field | Value |
|---|---|
Metadata point of contact |
|
Contact position |
Data Broker |
Organisation name |
NSW Department of Climate Change, Energy, the Environment and Water |
Telephone number |
131555 |
Email address |
|
Web address |
https://www.nsw.gov.au/departments-and-agencies/dcceew |
Responsible party role |
pointOfContact |
Metadata date |
2024-02-26T13:43:53.951309 |
Metadata language |
|