Phenology - MODIS, derived from MYD13A1 EVI, Australia coverage
The Australian Phenology Product is a continental data set that allows the quantitative analysis of Australia’s phenology derived from MODIS Enhanced Vegetation Index (EVI) data using an algorithm designed to accommodate Australian conditions. The product can be used to characterize phenological cycles of greening and browning and quantify the cycles’ inter and intra annual variability from 2003 to 2018 across Australia. Phenological cycles are defined as a period of EVI-measured greening and browning that may occur at any time of the year, extend across the end of a year, skip a year (not occur for one or multiple years) or occur more than once a year. Multiple phenological cycles within a year can occur in the form of double cropping in agricultural areas or be caused by a-seasonal rain events in water limited environments. Based on per-pixel greenness trajectories measured by MODIS EVI, phenological cycle curves were modelled and their key properties in the form of phenological curve metrics were derived including: the first and second minimum point, peak, start and end of cycle; length of cycle, and; the amplitude of the cycle. Integrated EVI under the curve between the start and end of the cycle time of each cycle is calculated as a proxy of productivity.
Simple
Identification info
- Date (Creation)
- 2019-11-01
- Date (Publication)
- 2021-10-05
- Date (Revision)
- 2014-07-14
- Edition
- 1.0
Publisher
Author
- Website
- https://www.tern.org.au/
- Purpose
- Land Surface Phenology (LSP) provides valuable information to scientists and practitioners interested in vegetation and ecosystem response to climate variability such as drought and land use change. Specific applications of LSP information include for example the quantification of crop yields, wildfire fuel accumulation, ecosystem resilience and health and land surface modelling.
- Credit
- We at TERN acknowledge the Traditional Owners and Custodians throughout Australia, New Zealand and all nations. We honour their profound connections to land, water, biodiversity and culture and pay our respects to their Elders past, present and emerging.
- Credit
- The development of the Australian Phenology Product was funded by the AusCover Facility of the Australian Terrestrial Ecosystem Research Network (TERN) and supported by ARC-DP1115479 grant entitled "Integrating remote sensing, landscape flux measurements, and phenology to understand the impacts of climate change on Australian landscapes" (Huete, CI). Calculations were preformed on the University of Technology, Sydney eResearch high performance computing facility.
- Status
- Completed
Point of contact
Point of contact
- Topic category
-
- Environment
- Imagery base maps earth cover
Extent
- Description
- Australia
Temporal extent
- Time period
- 2003-01-01 2018-12-31
Vertical element
- Minimum value
- 0.0
- Maximum value
- 0.0
- Reference system type
- Geodetic Geographic 3D
- Title
- A spatially explicit land surface phenology data product for science, monitoring and natural resources management applications
- Website
-
A spatially explicit land surface phenology data product for science, monitoring and natural resources management applications
Related documentation
- Title
- Land surface phenological response to decadal climate variability across Australia using satellite remote sensing
- Website
-
Land surface phenological response to decadal climate variability across Australia using satellite remote sensing
Related documentation
- Title
- Spatial patterns and temporal dynamics in savanna vegetation phenology across the North Australian Tropical Transect
- Website
-
Spatial patterns and temporal dynamics in savanna vegetation phenology across the North Australian Tropical Transect
Related documentation
- Title
- Data are also available on the UTS data server
- Website
-
Data are also available on the UTS data server
Related documentation
- GCMD Science Keywords
- ANZSRC Fields of Research
- TERN Platform Vocabulary
- TERN Instrument Vocabulary
- TERN Parameter Vocabulary
- GCMD Horizontal Resolution Ranges
- GCMD Temporal Resolution Ranges
Resource constraints
- Use limitation
- The Creative Commons Attribution 4.0 International (CC BY 4.0) license allows others to copy, distribute, display, and create derivative works provided that they credit the original source and any other nominated parties. Details are provided at https://creativecommons.org/licenses/by/4.0/
- File name
- 88x31.png
- File description
- CCBy Logo from creativecommons.org
- File type
- png
- Title
- Creative Commons Attribution 4.0 International Licence
- Alternate title
- CC-BY
- Edition
- 4.0
- Access constraints
- License
- Use constraints
- Other restrictions
- Other constraints
- TERN services are provided on an "as-is" and "as available" basis. Users use any TERN services at their discretion and risk. They will be solely responsible for any damage or loss whatsoever that results from such use including use of any data obtained through TERN and any analysis performed using the TERN infrastructure. <br />Web links to and from external, third party websites should not be construed as implying any relationships with and/or endorsement of the external site or its content by TERN. <br /><br />Please advise any work or publications that use this data via the online form at https://www.tern.org.au/research-publications/#reporting
- Other constraints
- Please cite this dataset as {Author} ({PublicationYear}). {Title}. {Version, as appropriate}. Terrestrial Ecosystem Research Network. Dataset. {Identifier}.
Resource constraints
- Classification
- Unclassified
Distribution Information
Distributor
Distributor
- OnLine resource
- Phenology catalog tern server
Data quality info
- Hierarchy level
- Dataset
- Other
- The quality of the phenological parameters could be limited by the spatial-temporal resolution of the input data, sub pixel clouds, and by the ‘local’ applicability of the gap filling, smoothing, and curve fitting methodology within the phenology algorithm that is applied at national scale.<br> The dataset covers all of Australia. The input dataset is the complete 2000-2012 MOD13C1 16-day record. Individual pixel observations with less than a “good data” MOD13C1 QA flags are gap filled (interpolated).
Report
Result
- Statement
- Validation of seasonal/phenologic parameters is accomplished across a wide range of Australian landscapes through comparisons with finer resolution (half-hourly/ daily) OzFlux eddy covariance tower measures of gross primary productivity (GPP) and evapotranspiration (ET). Tower measurements of actual photosynthetic activity (GPP) primarily relate to onset, duration, magnitude, and growing season length. Tower measures of ET potentially provide more accurate measures of vegetation green-up and duration in the arid and semiarid landscapes. At regional levels, we plan validation activities focused on the use of phenocam networks that capture the seasonal dynamics and species-level phenology of overstory and understory plant functional types. This is being prototyped in NSW and thenceforth to be expanded to TERN supersites, and transects. We are exploring the availability, prevalence, and cost-effectiveness of using CSIRO's Wireless Sensor Network technology for 'light' sensors.
Resource lineage
- Statement
- R software, Savitzsky-Golay filtering and double-logistics curve modelling is used to generate the entire set of seasonal metrics from MOD13C1 EVI data cubes.
- Hierarchy level
- Dataset
Process step
- Description
- Seasonal/phenologic parameters: Validation of seasonal/phenologic parameters is accomplished across a wide range of Australian landscapes through comparisons with finer resolution (half-hourly/ daily) OzFlux eddy covariance tower measures of gross primary productivity (GPP) and evapotranspiration (ET)
Process step
- Description
- Tower measurements: Tower measurements of actual photosynthetic activity (GPP) primarily relate to onset, duration, magnitude, and growing season length. Tower measures of ET potentially provide more accurate measures of vegetation green-up and duration in the arid and semiarid landscapes
Process step
- Description
- Regional levels: At regional levels, we plan validation activities focused on the use of phenocam networks that capture the seasonal dynamics and species-level phenology of overstory and understory plant functional types. This is being prototyped in NSW and thenceforth to be expanded to TERN supersites, and transects. We are exploring the availability, prevalence, and cost-effectiveness of using CSIRO's CSIRO Wireless Sensor Network technology for 'light' sensors. The combined use of a PAR sensor (400-700nm) and total radiation sensor (0.4 to 3.5um) enables the calculation of Visible/ Near-infrared based broadband vegetation indices yielding in situ measures of seasonal vegetation profiles.
Process step
- Description
- MOD13C1 QA flags: Less than “good data” MOD13C1 QA flags occur more frequently during the monsoon season at tropical latitudes near the coast and during the southern hemisphere winter at higher latitudes. The west coast of Tasmania and high elevation areas in South Eastern Australia also have more frequent cloud cover causing data gaps. The gap filling scheme used by the phenology algorithm overcomes the issue of missing observation in most cases except for areas with persistent cloud cover.
Process step
- Description
- MOD13C1 QA flags: Less than “good data” MOD13C1 QA flags occur with very high frequency over highly reflecting surfaces (salt crusts) in the continent’s interior. The gap filling method and the subsequently derived phenological metrics should not be considered reliable.
Process step
- Description
- Seasons in Australia: Seasons in Australia do only in certain regions ‘fit’ within a calendar year. The implication for data completeness is that part of a season that occurred in the beginning of 2000 or in late 2012 may not be captured by the derived phenological metrics as the season’s complete trajectory is not covered by the input data time series.
Process step
- Description
- Input data: MOD13C2 product EVI 0.05-degree 16 day input data.
Reference System Information
- Reference system identifier
- EPSG/EPSG:4326
- Reference system type
- Geodetic Geographic 2D
Metadata
- Metadata identifier
-
urn:uuid/2bb0c81a-41a9-434c-b87a-db0301cb52fb
- Title
- TERN GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
Point of contact
Type of resource
- Resource scope
- Dataset
- Metadata linkage
-
https://geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/2bb0c81a-41a9-434c-b87a-db0301cb52fb
Point-of-truth metadata URL
- Date info (Creation)
- 2019-11-01T00:00:00
- Date info (Revision)
- 2021-07-14T00:00:00
Metadata standard
- Title
- ISO 19115-1:2014/AMD 1:2018 Geographic information - Metadata - Fundamentals
- Edition
- 1
Metadata standard
- Title
- ISO/TS 19115-3:2016
- Edition
- 1.0
Metadata standard
- Title
- ISO/TS 19157-2:2016
- Edition
- 1.0
- Title
- Terrestrial Ecosystem Research Network (TERN) Metadata Profile of ISO 19115-3:2016 and ISO 19157-2:2016
- Date (published)
- 2021
- Edition
- 1.0