MODIS Derived Primary Productivity: Overall Hotspots

<p>The dataset indicates the long-term overall primary productivity hotspots of ocean surface waters. They are derived from MODIS (aqua) images using NASA's SeaDAS image processing software. The monthly chlorophyll a images between July 2002 and August 2014 are used to identify the overall primary productivity hotspots. The extent of the dataset covers the entire Australian EEZ and surrounding waters (including the southern ocean). The value (between 0 and 1.0) of the dataset represents the likelihood of the location being a primary productivity hotspot.

<p>This research is supported by the National Environmental Science Program (NESP) Marine Biodiversity Hub through Project D1.

Simple

Identification info

Date (Creation)
2017-11-28T00:00:00
Date (Publication)
2018-01-03T22:32:37
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/115245

Citation identifier
Digital Object Identifier/http://dx.doi.org/10.4225/25/5a4d5951881cb

Cited responsible party
Role Organisation / Individual Name Details
Author

Huang, Z.
Status
Point of contact
Role Organisation / Individual Name Details
Author

Huang, Z.

Commonwealth of Australia (Geoscience Australia)

 Voice
Resource provider

EGD

Commonwealth of Australia (Geoscience Australia)

 Voice
Spatial representation type
Grid

Spatial resolution

Level of detail

0.01 dd

Topic category
  • Oceans

Extent

Temporal extent

Time period
2002-07-01 2016-12-31

Extent

N
S
E
W


Maintenance and update frequency
As needed

Resource format

Title

Product data repository: Various Formats

Website

Data Store directory containing the digital product files

Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes

Feature type

  • primary productivity

Instrument

  • MODIS

Australian and New Zealand Standard Research Classification: Fields of Research

  • Earth Sciences

Keywords

  • National Environmental Science Program

Keywords

  • Marine Biodiversity Hub

Keywords

  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

 Voice
OnLine resource

Download the data (tif)

Download the data (tif)

Resource lineage

Statement

The daily MODIS Aqua Chlorophyll a images processed to Level 2 were obtained from the Integrated Marine Observing System (IMOS; http://imos.org.au/) remote sensing facility. The Chlorophyll a algorithm used is the semi-analytical GSM algorithm (Garver and Siegel 1997; Maritorena et al. 2002). The monthly Chlorophyll a images were generated by mosaicking the daily Chlorophyll a images, where the overlapping locations have average values of the overlapping cells. The topographic position index (TPI) (Weiss 2001) images were then calculated from the monthly Chlorophyll a images. A positive and large TPI value indicates a likely primary productivity hotspot location. Next , the TPI images were converted into the hotspot likelihood images by using the following rules:

1. If the TPI value is greater than 0.5 time of the TPI image's spatial standard deviation (STD) then the likelihood equals to 1.0.

2. If the TPI value is smaller than 0.1 time of TPI image's spatial standard deviation (STD) then the likelihood equals to 0.

3. If the TPI value is greater than 0.1 time but smaller than 0.5 time of TPI image's spatial standard deviation (STD) then the likelihood is calculated using this linear equation: (TPI - 0.1*STD)/0.4*STD.

It should be noted that the TPI images have variable spatial standard deviations.


The temporal mean was then calculated from all of the monthly primary productivity likelihood images between July 2002 and August 2014 to represent the overall likelihood of primary productivity hotspots.


The Great Barrier Reef and a number of offshore reefs have been masked out due to the unreliable MODIS Chlorophyll a values known to occur at these shallow water areas.

Hierarchy level
Dataset

Metadata constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/978bd264-a795-4959-afc5-07021e238017

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Huang, Z.

Commonwealth of Australia (Geoscience Australia)

 Voice

Type of resource

Resource scope
Dataset

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/115245

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/978bd264-a795-4959-afc5-07021e238017

Date info (Creation)
2017-11-28T03:24:47
Date info (Revision)
2018-04-20T05:50:40

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

Spatial extent

N
S
E
W


Keywords

MODIS Marine Biodiversity Hub National Environmental Science Program primary productivity
Australian and New Zealand Standard Research Classification: Fields of Research
Earth Sciences

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Associated resources

Not available