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Product pages » Ecosystem Disturbance Index - MODIS, Australia and New Zealand coverage (Experimental Product Version 1)

Ecosystem Disturbance Index - MODIS, Australia and New Zealand coverage (Experimental Product Version 1)

Last modified by Matt Paget on 2016/06/28 23:56

Ecosystem Disturbance Index - MODIS, Australia and New Zealand coverage (Experimental Product Version 1)

dist_index_500m_aqua_ANZ_2009.png

Figure 1:Disturbance Index image for 2009 over Australia and New Zealand

Link to the data

DescriptorData link
Persitent URLhttp://www.auscover.org.au/purl/modis-disturbance-index
GeoNetwork record
netCDFhttp://data.c3.uts.edu.au/thredds/catalog/auscover/EDI.v01.austnz.500m.nc/catalog.html
GeoTIFF

Data licence and Access rights

ItemDetail
RightsCopyright 2014 UTS. Rights owned by the University of Technology Sydney (UTS). Rights licensed subject to Creative Commons Attribution (CC BY).
LicenceCreative Commons Attribution 3.0 License, http://creativecommons.org/licenses/by/3.0.
AccessThese data can be freely downloaded and used subject to the CC BY licence. Attribution and citation is required as described at http://www.auscover.org.au/citation. We ask that you send us citations and copies of publications arising from work that use these data.

Abstract or Summary

The Disturbance Index (DI; Mildrexler et al. 2007) can be used to detect the timing, location and magnitude of major ecosystem disturbances such as wildfire, flooding, climate change and human-triggered land use. MODIS Aqua Land Surface Temperature (LST; MYD11A2) and Terra Enhanced Vegetation Index (EVI; MOD13A1) data from 2001 to 2013 were used to generate the DI product. The algorithm is based on the consistent radiometric relationship between LST and EVI computed on a pixel-by-pixel basis. Annual maximum composites of LST and EVI data were used to detect fundamental changes in land cover and surface energy partitioning.  Annual DI maps were calculated as,

    DILST⁄EVI =   LSTmax / EVImax


                      LSTmean / EVImean

where DILST⁄EVI is the disturbance index (DI) value, LSTmax is the annual maximum of eight-day composite LST, EVImax is annual maximum of 16-day EVI, LSTmean is the multiyear mean of LSTmax and EVImean is multiyear mean of EVImax.

Spatial and Temporal extents

ItemDetail
Spatial resolution (metres)500 m
Spatial coverage (degrees)112 to 180 E, 10 to 48 S
Temporal resolutionAnnual
Temporal coverage2000 to 2013
Sensor & platformMODIS Terra and Aqua
ItemDetail
Spatial representation typegrid
Spatial reference systemWGS 84

Point of contact

ItemDetail
NameProf. Alfredo Huete
OrganisationUniversity of Technology Sydney (UTS)
PositionProfessor
Emailalfredo.huete@uts.edu.au
RoleprincipleInvestigator
Address15 Broadway Road, Ultimo, NSW 2007, Australia
Telephone+61 2 9514 4084
URLwww.c3.uts.edu.au
ItemDetail
NameDr. Rakhesh Devadvas
OrganisationUniversity of Technology Sydney (UTS)
PositionData Manager in eResearch
Emailrakhesh.devadas@uts.edu.au
RolepointOfContact
Address15 Broadway Road, Ultimo, NSW 2007, Australia
Telephone+61 2 9524 8351
URLwww.c3.uts.edu.au

Credit [optional]

Keywords

ThesauriKeyword
GCMDEARTH SCIENCE > BIOSPHERE > VEGETATION > VEGETATION INDEX
GCMDEARTH SCIENCE > LAND SURFACE > LAND TEMPERATURE > LAND SURFACE TEMPERATURE
CFvegetation_index
CFsurface_temperature_where_land
FoREnvironmental Sciences > Ecological Applications = 0501

There are three main thesauri that AusCover recommends:

  1. Global Change Master Directory (http://gcmd.nasa.gov)
  2. Climate and Forecast (CF) convention standard names (http://cfconventions.org/standard-names.html).
  3. Fields of Research codes (http://www.abs.gov.au/ausstats/abs@.nsf/0/6BB427AB9696C225CA2574180004463E?opendocument).

Data quality

LPDAAC are responsible for the actual data quality and provide quality channels as part of most products.  These channels are processed the same as the data channels.  The mosaicing, remapping and reformatting processes do not alter either the data or the quality fields.

Quality assessment of the LPDAAC MODIS products is undertaken by the MODIS Land Data Discipline Team, http://landweb.nascom.nasa.gov.

Data set specific link(s) for MOD13A1 and MYD11A2 products are:

Users should be aware that not all tiles for a particular mosaic necessarily become available from the LPDAAC on the same day.  It is therefore possible that the most recent mosaic for any given product will be updated over several days, each time containing progressively more actual data within the same (standard) geographic extent.

We have had some minor issues with file corruption that have been detected by users unable to un-gzip the mosaic files.  If you discover any such files, please report them to us (see contacts section).

Flags used for MOD13A1 datasets are as below:

FlagsBit Combination (accepted range)
MODLAND_QA <10
VI usefulness<1100
Mixed Clouds>0
Land/Water Flag001,011,100 and 101
Possible snow/ice<1
Possible shadow<1

Flags used for MYD11A2 datasets are as below:

FlagsBit Combination (accepted range)
Mandatory QA <10
Data Quality<10
Emis Error<11
LST Error<11

Validation status

Quality assessment of the LPDAAC MODIS products is undertaken by the MODIS Land Data Discipline Team, http://landweb.nascom.nasa.gov.Data set specific link(s) for MOD13A1 and MYD11A2 products are:

Related products

ItemProduct link
MODIS EVI-LSTEnhanced Vegetation Index (EVI) and Land Surface Temperature (LST) - MODIS, spatially and temporally interpolated, Australia coverage
LPDAAC EVINormalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) - MODIS, LPDAAC MOD13Q1 mosaic, Australia coverage
LPDAAC LSTLand Surface Temperature and Emissivity - MODIS, LPDAAC MxD11 mosaic, Australia coverage

References

ItemDetail or link
Publication
Validation report
Online info
References

Mildrexler, D. J., Zhao, M., Heinsch, F. A., & Running, S. W. (2007). A New Satellite-Based Methodology for Continental-Scale Disturbance Detection. Ecological Applications, 17(1), 235–250. doi:10.2307/40061990

Mildrexler, D. J., Zhao, M., & Running, S. W. (2009). Testing a MODIS Global Disturbance Index across North America. Remote Sensing of Environment, 113(10), 2103–2117. doi:10.1016/j.rse.2009.05.016

Algorithm summary

Annual Disturbance Index (Mildrexler et al. 2007) maps were calculated as,    

   DILST⁄EVI =   LSTmax / EVImax


                      LSTmean / EVImean

where DILST⁄EVI is the disturbance index (DI) value, LSTmax is the annual maximum of eight-day composite LST, EVImax is annual maximum of 16-day EVI, LSTmean is the multiyear mean of LSTmax and EVImean is multiyear mean of EVImax.

Detailed user guide and ATBD can be found as the attachment dist_index_500m_aqua_ANZ_2009.pdf.

Product version history

Version labelDetail
1.0Initial release

Metadata history

DateDetail
2014-07-03Metadata creation date
Tags:
Created by Matt Paget on 2014/07/03 10:32

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