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Record Search Query:

Changes in vegetation on Macquarie Island 2000 to 2007

Entry ID: ASAC_1015_macca_veg_change

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Summary

Abstract: Taken from the report in the download file:

Plot data and satellite imagery were used to examine changes in vegetation between 2000 and 2007. These data were examined in light of changes in rabbit numbers (data owned by and provided to us from Parks and Wildlife Tasmania).

Methods and data

Vegetation Change. Kate Kiefer established 18 relatively homogenous plots of 25 m2 in a range of ... vegetation types between November and March 2001. Individual plant species cover was visually calculated within five random 1m2 quadrats within each site and mean values determined. Dana Bergstrom, Kate Kiefer, Jane Wasley and Arko Lucieer re-sampled the same sites in April 2007. The data matrix consisted of 18 sites, 34 taxa and temporally separated sampling intervals: 2001 and 2007. Species also included collective categories for leafy bryophytes, lichens, bare ground and dead vegetation. At each site altitude, slope, aspect, a subjective estimate of the wind exposure and the degree of waterlogging were also recorded. The data matrix of sites and mean cover for the site (mean of cover from 5 x 1 m2 quadrats) is provided. Also in the data matrix is GPS location of the site which is recorded for each star picket that marks each site on the island. Site code consist of site number (first two numerals) - year 01 or 07 (2001 or 2007). The data matrix also includes some site information: a subjective exponential soil-water scale (1- 5: dry - wet); a subjective exponential site exposure scale (1-5: sheltered to exposed); slope, altitude, aspect and mean substrate depth (mean of three random probes across the site) (Data Table 1). Changes at the site and rabbit activity are summarised in Data Table 2.

Remote Sensing Imagery. Information on changes in vegetation communities were scaled up to whole-island level using satellite imagery. We used Landsat ETM+ imagery acquired on 12 December 2000 and Quickbird imagery acquired on 15 March 2007 to detect changes in vegetation cover on Macquarie Island. The Quickbird image with its 2.4 m pixel size was resampled (by pixel averaging) to the 25 m Landsat pixel size to compare the images at the same resolution. The images were orthorectified to correct terrain and geometric distortions. Radiometric, illumination, and atmospheric differences were also corrected. These corrections are crucial for change detection algorithms as false changes are often introduced by geometric offsets and shadowing effects. Multispectral bands 1 (blue), 2 (green), 3 (red), and 4 (near-infrared (NIR)) of both images were used for change detection.

The fields in this dataset are:

Site
Species
Latitude
Longitude
Water
Exposure
Slope
Aspect
Altitude
Rabbits
Cover
Temperature

Related URL

Link: GET DATA

Description: Download the vegetation report and datasets

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

	N: -54.5	S: -54.75	E: 158.95	W: 158.8
Min Altitude: 5 M Max Altitude: 381 M

Data Set Citation

Dataset Release Date: 2012-04-12

Temporal Coverage

Start Date: 2000-12-12

Stop Date: 2007-04-30

Location Keywords

OCEAN > SOUTHERN OCEAN

OCEAN > SOUTHERN OCEAN > MACQUARIE ISLAND

GEOGRAPHIC REGION > POLAR

Science Keywords

BIOSPHERE > VEGETATION > DOMINANT SPECIES

BIOSPHERE > VEGETATION > FOREST COMPOSITION/VEGETATION STRUCTURE

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Platform

DMSP 5D-2/F10 > Defense Meteorological Satellite Program-F10

Instrument

OLS > Operational Linescan System

Project

EOSDIS > Earth Observing System Data Information System

ESIP > Earth Science Information Partners Program

CWIC > CEOS WGISS Integrated Catalog

Access Constraints Data available to the general public

Use Constraints There are no constraints on the use of this data set.

Ancillary Keywords

AIR FORCE

DMSP/OLS

Data Set Progress

PLANNED

Originating Center

MSFC/GHRC

Data Center

Global Hydrology Resource Center, Marshall Space Flight Center, NASA

Data Center URL: http://ghrc.nsstc.nasa.gov/
Dataset ID: olsdig10

Data Center Personnel
Name: GHRC USER SERVICES OFFICE Phone: 256-961-7932 Fax: 256-961-7859 Email: ghrcdaac at itsc.uah.edu Contact Address: GHRC User Services Office Global Hydrology Resource Center (GHRC) 320 Sparkman Drive City: Huntsville Province or State: AL Postal Code: 35805 Country: USA

Distribution

Distribution Media: FTP

Distribution Format: HDF

Fees: none

Personnel

RICHARD BLAKESLEE

Role: INVESTIGATOR

Role: TECHNICAL CONTACT

Phone: 256-961-7962

Fax: 256-961-7348

Email: Rich.Blakeslee at nasa.gov

Contact Address:

Global Hydrology and Climate Center

320 Sparkman Drive

City: Huntsville

Province or State: AL

Postal Code: 35805

Country: USA

SHERRY HARRISON

Role: DIF AUTHOR

Phone: 256-961-7973

Email: ghrcdaac at itsc.uah.edu

Contact Address:

320 Sparkman Dr.

City: Huntsville

Province or State: AL

Postal Code: 35805

Country: USA

Publications/References

Goodman S.J and H.J. Christian, Global Observations of Lightning,
Atlas of Satellite Observations Related to Global Change,
R. J. Gurney, Foster J.L. and C.L. Parkinson (eds.), Cambridge
University Press, London, p.p. 191- 211, 1993.

Orville R.E. and R.W. Henderson, Global Distribution of Midnight
Lightning: September 1977 to August 1978, Monthly Weather ...

Creation and Review Dates

Last DIF Revision Date: 2011-04-04

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